Abrégé

Provided are a perpendicular magnetic recording medium capable of accommodating a higher recording density than conventional media, and a method for the production of the perpendicular magnetic recording medium. The perpendicular magnetic recording medium has at least a seed layer of an amorphous ceramic, a crystalline orientation control layer, and a magnetic layer of a material comprising a FePt alloy as the main component, formed in that order upon a substrate. Preferably, the perpendicular magnetic recording medium is produced by a process wherein at least the seed layer, the orientation layer and the magnetic layer of a material comprising a FePt alloy as the main component are formed in that order on the substrate by means of sputtering, and the magnetic layer is formed at a prescribed temperature of 500°C or less.

Classes IPC  ?

• G11B 5/738 - Couches de base caractérisées par la couche intermédiaire
• G11B 5/64 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/667 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques comprenant une couche magnétique douce
• G11B 5/851 - Revêtement d'un support avec une couche magnétique par pulvérisation cathodique

Abrégé

Disclosed is a lubricating agent for magnetic disks, which has excellent heat resistance and is suitably used for a magnetic disk that is equipped in a magnetic recording apparatus that uses a thermally assisted magnetic recording system. Also disclosed is a magnetic disk which comprises a lubricating layer that contains the lubricating agent. Specifically disclosed is a lubricating agent for magnetic disks, which contains a compound wherein perfluoropolyether groups, each having a perfluoropolyether main chain in the structure and a phosphazene ring at an end, are bonded with each other by a linking group. The linking group is an aliphatic group or a phosphazene ring. Also specifically disclosed is a magnetic disk comprising at least a magnetic recording layer, a protective layer and a lubricating layer on a substrate, wherein the lubricating layer contains the above-described lubricating agent for magnetic disks.

Classes IPC  ?

• C10M 105/74 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un composé organique non macromoléculaire contenant du phosphore
• C10M 107/38 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un composé macromoléculaire contenant des halogènes
• G11B 5/725 - Revêtements protecteurs, p. ex. antistatiques contenant un lubrifiant
• G11B 5/82 - Disques
• C10N 20/04 - Poids moléculaireRépartition du poids moléculaire
• C10N 30/00 - Propriétés physiques ou chimiques particulières améliorées par l'additif caractérisant la composition lubrifiante, p. ex. additifs multifonctionnels
• C10N 30/06 - OnctuositéRésistance du filmAnti-usureRésistance aux pressions extrêmes
• C10N 30/08 - Résistance aux températures extrêmes
• C10N 40/18 - Usages électriques ou magnétiques en relation avec des enregistrements sur bandes ou disques magnétiques

Abrégé

A method for evaluating characteristics of a perpendicular magnetic recording medium that is suitable for obtaining a perpendicular magnetic recording medium that is adaptable to increased recording density. The evaluation method for the perpendicular magnetic recording medium includes: a step for recording a first signal of a specific frequency at an arbitrary first position on the perpendicular magnetic recording medium; a step for measuring a reproduction output of the first signal, and measuring a signal-to-noise ratio (default value) of the first signal at a peak position at which the reproduction output becomes largest; a step for recording a signal of a specific frequency at a second position separated from the first position by a predetermined distance in a radial direction of the perpendicular magnetic recording medium; a step for measuring again a signal-to-noise ratio of the first signal at the peak position; a step for repeating a step of recording a signal of a specific frequency at a position closer to the first position from the second position by a predetermined distance, and measuring again a signal-to-noise ratio of the first signal at the peak position, while sequentially approaching in a direction of the first position from the second position; and a step of determining whether the signal-to-noise ratio has decreased by at least a predetermined range relative to the default value.

Classes IPC  ?

• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement
• G11B 5/00 - Enregistrement par magnétisation ou démagnétisation d'un support d'enregistrementReproduction par des moyens magnétiquesSupports d'enregistrement correspondants

Abrégé

Provided is a method for producing a magnetic recording medium provided with a protection layer which is superior in corrosion resistance, mechanical durability, adhesion property to a lubricant layer, and stability against floating of a head, even when the layer is thin. A method for producing a magnetic recording medium wherein at least a magnetic layer, a carbon-based protection layer, and a lubricant layer are sequentially formed on a substrate, wherein the carbon-based protection layer is provided with a lower layer formed on the side of the magnetic layer and an upper layer formed on the side of the lubricant layer, the lower layer is formed by a chemical vapor deposition (CVD) method using a hydrocarbon-based gas, and then, the upper layer is formed using a mixture gas of a hydrocarbon-based gas and a nitrogen gas, and thereafter, the treatment for nitriding the surface of the upper layer is applied.

Classes IPC  ?

• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement
• G11B 5/72 - Revêtements protecteurs, p. ex. antistatiques
• G11B 5/725 - Revêtements protecteurs, p. ex. antistatiques contenant un lubrifiant

Abrégé

Provided is a method for producing a perpendicular magnetic recording medium which is compatible with even higher recording density. A method for producing a perpendicular magnetic recording medium which is used for recording information in a perpendicular magnetic recording system and comprises on a substrate at least a soft magnetic layer, an interlayer, and a magnetic recording layer, wherein the interlayer is formed from N consecutive layers (where N is an integer and at least 3) by first forming the film of the first layer, the primary component of which is Ru, and then setting the gas pressure for film formation to be the same as or higher than the pressure for the first layer and forming the film of the second layer, the primary component of which is Ru or Ru containing oxygen or an oxide, with the second and subsequent layers prepared such that the oxygen content remains the same or increases towards the top layer.

Classes IPC  ?

• G11B 5/851 - Revêtement d'un support avec une couche magnétique par pulvérisation cathodique
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/72 - Revêtements protecteurs, p. ex. antistatiques
• G11B 5/738 - Couches de base caractérisées par la couche intermédiaire

Abrégé

A perpendicular magnetic recording medium (100) comprises, on a substrate, a magnetic recording layer (122) for recording signals; a foundation layer (118), which is disposed underneath the magnetic recording layer (122) and is formed from Ru or an Ru compound; and a prefoundation layer (116), which is disposed underneath the foundation layer (118), is formed from a non-magnetic crystalline material, and serves to control the crystal orientation of the foundation layer (118). The prefoundation layer (116) comprises Ni as the primary component, W as a second element, and further, Al, Zr, or Si as a third element.

Classes IPC  ?

• G11B 5/738 - Couches de base caractérisées par la couche intermédiaire

Abrégé

A lubricant compound for magnetic disks which render a further reduction in magnetic spacing possible and which have high reliability under conditions in which the flying height of magnetic heads is small due to recent rapid increase in recording density and under the situation where extremely severe environmental resistance is required due to diversification of uses. The lubricant compound is for use in a magnetic disk comprising a substrate and, disposed thereon in the following order, at least a magnetic layer, a protective layer, and a lubricating layer and is to be incorporated into the lubricating layer. The lubricant compound comprises ingredient A and ingredient B both represented by chemical formula and ingredient C comprising a specific compound having a phosphazene ring in the structure.

Classes IPC  ?

• C10M 105/54 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un composé organique non macromoléculaire contenant des halogènes contenant du carbone, de l'hydrogène, des halogènes et de l'oxygène
• C10M 105/74 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un composé organique non macromoléculaire contenant du phosphore
• G11B 5/72 - Revêtements protecteurs, p. ex. antistatiques
• G11B 5/725 - Revêtements protecteurs, p. ex. antistatiques contenant un lubrifiant
• G11B 5/82 - Disques
• C10N 30/00 - Propriétés physiques ou chimiques particulières améliorées par l'additif caractérisant la composition lubrifiante, p. ex. additifs multifonctionnels
• C10N 40/18 - Usages électriques ou magnétiques en relation avec des enregistrements sur bandes ou disques magnétiques
• C10N 50/02 - Forme sous laquelle est appliqué le lubrifiant au matériau à lubrifier en solution ou en suspension dans un liquide porteur qui s'évapore ultérieurement pour laisser un revêtement lubrifiant

Abrégé

The concentration distribution of ions to be implanted into the magnetic recording layer of a perpendicular magnetic recording medium is suitably set in the perpendicular direction, corresponding to a layer into which the ions are to be implanted. A method for manufacturing a perpendicular magnetic recording medium (100) includes: a magnetic recording layer forming step wherein a magnetic recording layer (122) is formed on a disc base body (110); a resist layer forming step wherein a resist layer (130) is formed on the magnetic recording layer; a patterning step wherein the thickness of the resist layer is partially changed by processing the resist layer, and a predetermined pattern having a recessed section and a protruding section is formed; and an ion implanting step wherein the ions are implanted into a plurality of layers, including the magnetic recording layer, in the state of having the resist film therebetween. In the ion implanting step, the layer into which the ions are to be implanted is determined by adjusting the quantity of energy to be used for the ion implantation, and the total quantity of the ions to be implanted into each layer is determined by adjusting the time for maintaining the energy quantity.

Classes IPC  ?

• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement
• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques

Abrégé

Provided are a magnetic recording medium with improved HDI characteristics such as impact resistance, and a production method of the same. In a representative configuration of the magnetic recording medium, at least a magnetic recording layer (122), a protection layer (126), and a lubricant layer (128) are provided upon a substrate. Therein, the magnetic recording layer (122) comprises, in the surface direction thereof, magnetic recording parts (136) composed of a magnetic material, and non-recording parts (134) magnetically separating the magnetic recording parts (136), and the surfaces corresponding to the non-recording parts (134) is raised compared to the surfaces corresponding to the magnetic recording parts (136).

Classes IPC  ?

• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/72 - Revêtements protecteurs, p. ex. antistatiques
• G11B 5/725 - Revêtements protecteurs, p. ex. antistatiques contenant un lubrifiant
• G11B 5/82 - Disques
• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement

Abrégé

A magnetic disk comprising a granular magnetic recording layer, with little noise even when the recording capacity thereof is 250 Gbits per square inch or greater;  also a method for manufacturing the magnetic disk.  The magnetic disk comprises: a granular magnetic recording layer (20) which is formed on a disk base (10) directly or with an intermediate layer interposed therebetween and which has a non-magnetic region between granular columnar particles; and an auxiliary recording layer (22) which is formed on the granular magnetic recording layer (20) and which causes exchange interactions among the granular columnar particles.  The auxiliary recording layer (22) contains 0.1 to 3 moles of oxygen.

Classes IPC  ?

• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/851 - Revêtement d'un support avec une couche magnétique par pulvérisation cathodique

Abrégé

In a vertical magnetic recording medium having the ECC structure, it is possible to improve the control accuracy of the film thickness of the exchange coupling control layer and improve the recording reproduction characteristic. Provided is a vertical magnetic recording medium having: a first recording layer (14a) made from a ferromagnetic material, an exchange coupling control layer (14b), and a second recording layer (14c) made from a ferromagnetic material which are layered in this order on a base (11).  The exchange coupling control layer (14b) is made from a CoCr-based alloy containing at least 30 atomic % of Cr.

Classes IPC  ?

• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques
• G11B 5/738 - Couches de base caractérisées par la couche intermédiaire

Abrégé

Disclosed is a magnetic disk that has high durability, particularly high LUL durability and CFT properties and can exhibit high reliability under a low-levitation level of a magnetic head due to a rapid increase in recording density in recent years and under very high environmental tolerance required due to diversification of applications. The magnetic disk comprises a substrate and at least a magnetic layer, a carbonaceous protective layer, and a lubricating layer provided in this order on the substrate.  The lubricating layer is formed of a lubricating agent that contains two types of compounds having a perfluoropolyether main chain in the structure.  The molecular weight distribution of the whole two types of compounds is in the range of 1 to 1.2.  The two types of compounds include a compound (a) having a hydroxyl group at an end thereof and a compound (b) having a number average molecular weight that is smaller than the number average molecular weight of the compound (a) and is not more than 1500.  The content of the compound (b) in the two types of compounds is not more than 10%.

Classes IPC  ?

• G11B 5/725 - Revêtements protecteurs, p. ex. antistatiques contenant un lubrifiant
• C10M 107/38 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un composé macromoléculaire contenant des halogènes
• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement
• C10N 20/04 - Poids moléculaireRépartition du poids moléculaire
• C10N 30/00 - Propriétés physiques ou chimiques particulières améliorées par l'additif caractérisant la composition lubrifiante, p. ex. additifs multifonctionnels
• C10N 30/06 - OnctuositéRésistance du filmAnti-usureRésistance aux pressions extrêmes
• C10N 40/18 - Usages électriques ou magnétiques en relation avec des enregistrements sur bandes ou disques magnétiques

Abrégé

A magnetic recording medium can be provided with a protective layer which achieves an improvement in durability such as sliding resistance and corrosion resistance while maintaining high coercive force. A method for manufacturing a magnetic recording medium is characterized by comprising a magnetic recording layer deposition step for depositing a magnetic recording layer (122), and a protective layer deposition step for depositing a protective layer (126) by a CVD (Chemical Vapour Deposition) method, wherein in the protective layer deposition step, the protective layer (126) is deposited in an atmosphere with a second pressure after being deposited in an atmosphere with a first pressure, and the second pressure is less than the first pressure.

Classes IPC  ?

• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement
• G11B 5/72 - Revêtements protecteurs, p. ex. antistatiques

Abrégé

Provided are a vertical magnetic recording medium which can reduce oxide mixed into magnetic particles of a magnetic recording layer and improve the crystal orientation of the magnetic particles so as to increase the coercive force Hc and improve the reliability of the vertical magnetic recording medium.  Provided is also a method for manufacturing the vertical magnetic recording medium. The vertical magnetic recording medium (100) includes on a disc base: an undercoat layer (118) made from Ruthenium and a magnetic recording layer (122) for recording a signal, which layers are layered in this order.  The undercoat layer (118) is formed by a first undercoat layer (118a) and a second undercoat layer (118b).  When the first undercoat layer contains A mol % of oxygen, the second undercoat layer contains B mol % of oxygen, and the magnetic recording layer contains C mol % of oxygen, the following relationship is satisfied between the contents: A < B < C.

Classes IPC  ?

• G11B 5/738 - Couches de base caractérisées par la couche intermédiaire
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques

Abrégé

Provided are a vertical magnetic recording medium and a method for manufacturing the same which can reduce a noise caused by an auxiliary recording layer so as to improve the SNR and achieve a further high recording density. The vertical magnetic recording medium (100) includes on a base: a magnetic recording layer (122) of the granular structure having a non-magnetic granule boundary portion formed between crystal particles grown in the columnar shape; a non-magnetic segmented layer (124) arranged on the magnetic recording layer (122) and containing Ru and oxygen; and an auxiliary recording layer (126) which is arranged on the segmented layer (124) and is almost continuous magnetically in the in-plane direction of the main surface of the base (110).

Classes IPC  ?

• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition

Abrégé

Provided is a vertical magnetic recording medium which can further improve the SNR while assuring a high coercive force Hc and achieve a further high recording density. The vertical magnetic recording medium (100) includes on a base (110): a first magnetic recording layer (122a) of the granular structure having a non-magnetic granule boundary portion formed between crystal particles grown in the columnar shape; a non-magnetic segmented layer (122b) arranged on the first magnetic layer and containing Ru; and a second magnetic recording layer (122c) of the granular structure arranged on the segmented layer and having a non-magnetic granule boundary portion formed between the columnar crystal granules.  The first magnetic layer and the second magnetic layer containing an oxide which forms the particle boundary portion.  When A is the amount of the oxide contained in the first magnetic layer and B is the amount of the oxide contained in the second magnetic layer, the relationship of the oxide contents A/B is in the range defined by: 0.5 < A/B < 1.0.

Classes IPC  ?

• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition

Abrégé

The specific permeability of a non-recording portion for separating magnetically a magnetic recording portion in a magnetic recording layer can be optimized to improve the writing characteristics and the reading characteristics of the magnetic recording portion.  Provided is a method for manufacturing a magnetic recording medium (100).  This manufacturing method comprises a magnetic recording layer filming step of filming a magnetic recording layer (122) on a disk substrate (110), a resist layer filming step of filming a resist layer (130) on the magnetic recording layer (122), a patterning step of forming a predetermined pattern having recesses and protrusions by treating the resist layer (130) thereby to vary the thickness of the resist layer (130) partially, and an ion implanting step of implanting ions into the magnetic recording layer (122) while interposing the resist layer (130).  The manufacturing method is characterized in that a region (a non-recording portion (134)) under the recesses of the magnetic recording medium after the ion implanting step has a specific permeability of 2 to 100.

Classes IPC  ?

• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/82 - Disques

Abrégé

It is possible to provide a magnetic disc having an excellent durability such as LUL durability and CFT characteristic and a high reliability even with a small flying height of a magnetic head accompanying a high recording density obtained these years and in the strict environment resistance accompanying a variety of applications. A magnetic disc (10) includes at least a magnetic layer (6), a carbon-based protection layer (7), and a lubricant layer (8) which are successively layered on a substrate (1). The lubricant layer (8) contains a chemical compound having a perfluoropolyether principal chain in its structure and a polar group other than at the end of a molecule.

Classes IPC  ?

• G11B 5/725 - Revêtements protecteurs, p. ex. antistatiques contenant un lubrifiant
• C10M 107/38 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un composé macromoléculaire contenant des halogènes
• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement
• C10N 20/04 - Poids moléculaireRépartition du poids moléculaire
• C10N 30/00 - Propriétés physiques ou chimiques particulières améliorées par l'additif caractérisant la composition lubrifiante, p. ex. additifs multifonctionnels
• C10N 30/06 - OnctuositéRésistance du filmAnti-usureRésistance aux pressions extrêmes
• C10N 40/18 - Usages électriques ou magnétiques en relation avec des enregistrements sur bandes ou disques magnétiques

Abrégé

It is possible to provide a vertical magnetic recording medium having an appropriate lubricant layer holding R/W characteristic while maintaining a sufficient durability and a sufficient resistance against humidity and contamination. Provided is a method for manufacturing a vertical magnetic recording medium (100) including a base (110), a magnetic recording layer (122), a medium protection layer (126), and a lubricant layer (128) which are layered in this order. The method includes: a CF connection density measurement step which measures a CF connection density of a lubricant; and a lubricant layer film formation step for forming a lubricant layer with a lubricant when the measured CF connection density is in a range from 2.0 × 1022 to 2.7 × 1022 atoms/cm3.

Classes IPC  ?

• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement
• C10M 105/54 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un composé organique non macromoléculaire contenant des halogènes contenant du carbone, de l'hydrogène, des halogènes et de l'oxygène
• C10M 107/38 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un composé macromoléculaire contenant des halogènes
• C10M 177/00 - Méthodes particulières de préparation des compositions lubrifiantesModification chimique par post-traitement des constituants ou de la composition lubrifiante elle-même, non couverte par d'autres classes
• G11B 5/725 - Revêtements protecteurs, p. ex. antistatiques contenant un lubrifiant
• C10N 20/00 - Propriétés physiques particulières des constituants des compositions lubrifiantes
• C10N 30/00 - Propriétés physiques ou chimiques particulières améliorées par l'additif caractérisant la composition lubrifiante, p. ex. additifs multifonctionnels
• C10N 30/06 - OnctuositéRésistance du filmAnti-usureRésistance aux pressions extrêmes
• C10N 40/18 - Usages électriques ou magnétiques en relation avec des enregistrements sur bandes ou disques magnétiques
• C10N 70/00 - Procédés particuliers de préparation

Abrégé

Disclosed is a magnetic disk that has excellent durability, particularly excellent LUL durability, and excellent alumina resistance and has a high level of reliability under a low floating quantity of a magnetic head involved in a recent tendency toward a rapid increase in recording density and a very severe environment resistance requirement due to diversified applications. A magnetic disk (10) comprises a substrate (1) and at least a magnetic layer (6), a carbonaceous protective layer (7), and a lubricating layer (8) provided in that order on the substrate (1). The lubricating layer (8) contains a compound that has a perfluoropolyether main chain in the structure thereof and has an aromatic group and a polar group at the end of the molecule.

Classes IPC  ?

• G11B 5/725 - Revêtements protecteurs, p. ex. antistatiques contenant un lubrifiant
• C10M 105/54 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un composé organique non macromoléculaire contenant des halogènes contenant du carbone, de l'hydrogène, des halogènes et de l'oxygène
• C10M 107/38 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un composé macromoléculaire contenant des halogènes
• G11B 5/72 - Revêtements protecteurs, p. ex. antistatiques
• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement
• C10N 20/04 - Poids moléculaireRépartition du poids moléculaire
• C10N 30/00 - Propriétés physiques ou chimiques particulières améliorées par l'additif caractérisant la composition lubrifiante, p. ex. additifs multifonctionnels
• C10N 30/06 - OnctuositéRésistance du filmAnti-usureRésistance aux pressions extrêmes
• C10N 40/18 - Usages électriques ou magnétiques en relation avec des enregistrements sur bandes ou disques magnétiques

Abrégé

Disclosed is a magnetic disk comprising a lubricating layer formed of a lubricant. The lubricant constituting the lubricating layer has excellent properties, for example, excellent fluidity, surface energy, and CFT properties. By virtue of the excellent properties, the magnetic disk has a high level of reliability despite a low floating quantity of a magnetic head due to a recent rapid increase in recording density and a very severe environment resistance requirement due to diversification of applications. The magnetic disk comprises a substrate and at least a magnetic layer, a protective layer, and a lubricating layer provided in that order on the substrate. The lubricating layer is formed of a lubricant that is a mixture of a specific perfluoropolyether lubricant with a lubricant formed of a compound comprising perfluoropolyether groups having a perfluoropolyether main chain in the structure thereof and having a hydroxyl group at the end thereof, the perfluoropolyether groups being bonded to each other through a divalent linking group having at least two hydroxyl groups in the structure thereof.

Classes IPC  ?

• G11B 5/725 - Revêtements protecteurs, p. ex. antistatiques contenant un lubrifiant
• C10M 105/54 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un composé organique non macromoléculaire contenant des halogènes contenant du carbone, de l'hydrogène, des halogènes et de l'oxygène
• C10M 107/38 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un composé macromoléculaire contenant des halogènes
• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement
• C10N 20/04 - Poids moléculaireRépartition du poids moléculaire
• C10N 30/00 - Propriétés physiques ou chimiques particulières améliorées par l'additif caractérisant la composition lubrifiante, p. ex. additifs multifonctionnels
• C10N 30/06 - OnctuositéRésistance du filmAnti-usureRésistance aux pressions extrêmes
• C10N 40/18 - Usages électriques ou magnétiques en relation avec des enregistrements sur bandes ou disques magnétiques

Abrégé

A vertical magnetic recording medium is provided with a magnetic recording layer having a granular structure containing Co, and an auxiliary recording layer, and in the vertical magnetic recording medium, noise of electromagnetic conversion characteristics is reduced. The vertical magnetic recording medium is provided with, on a nonmagnetic substrate, a first magnetic recording layer (20a) having a granular structure wherein a nonmagnetic grain boundary section is provided between columnar magnetic particles containing at least Co; a nonmagnetic layer (22) arranged on the first magnetic recording layer (20a); a second magnetic recording layer (20b), which is arranged on the nonmagnetic layer (22) and has a granular structure wherein a nonmagnetic grain boundary section is provided between columnar magnetic particles containing Co; and an auxiliary recording layer (24) arranged on the second magnetic recording layer (20b).

Classes IPC  ?

• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/738 - Couches de base caractérisées par la couche intermédiaire

Abrégé

Provided are a method for manufacturing a perpendicular magnetic recording medium (100) which achieves a high-level balance between coercive force Hc and reliability even if heating is performed when a medium protective layer (126) is formed, and the perpendicular magnetic recording medium (100). The method for manufacturing the perpendicular magnetic recording medium (100) provided with at least a magnetic recording layer (122b) that is a granular-structured ferromagnetic layer in which a nonmagnetic grain boundary portion is formed between columnarly grown crystal grains and the medium protective layer (126) composed mostly of carbon hydride in this order on a disk substrate (110) is characterized by comprising a magnetic recording layer forming step of forming the magnetic recording layer (122b) such that the grain boundary portion contains plural types of oxides, and a medium protective layer forming step of forming the medium protective layer (126) in a state in which the disk substrate (110) on which the magnetic recording layer (122b) is formed is heated to 160°C to 200°C.

Classes IPC  ?

• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques
• G11B 5/72 - Revêtements protecteurs, p. ex. antistatiques

Abrégé

The objective of the invention is to further promote the separation and isolation of the magnetic grains of a magnetic recording layer (122) in a vertical magnetic recording medium (100), thereby enhancing the electromagnetic transducing characteristic (in particular, SNR) therein. A typical structure of a vertical magnetic recording medium (100) comprises at least a non-magnetic granular layer (120) and a magnetic recording layer (122) formed on a substrate (110) in the named order. The non-magnetic granular layer (120) has a granular structure in which grain boundary parts each containing one or more oxides are formed between non-magnetic grains continuously grown in columnar shapes. The magnetic recording layer (122) is formed continuously with the non-magnetic granular layer (120) and has a granular structure in which grain boundary parts each containing one or more oxides are formed between magnetic grains continuously grown in columnar shapes. At least one oxide contained in the grain boundary parts of the non-magnetic granular layer (120) has the same composition as at least one oxide contained in the grain boundary parts of the magnetic recording layer (122).

Classes IPC  ?

• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques
• G11B 5/738 - Couches de base caractérisées par la couche intermédiaire

Abrégé

Provided is a vertical magnetic recording medium (100) including a magnetic recording layer (122) which has a two-layer structure and in which the grain sizes of crystal grains are so designed as to improve SNR, while maintaining a high coercivity. According to a method for making the vertical magnetic recording medium (100), the vertical magnetic recording medium (100) comprises at least a groundwork layer (118), a first magnetic recording layer (122a) and a second magnetic recording layer (122b) formed on a disc substrate (110) in the named order. The first and second magnetic recording layers (122a, 122b) are ferromagnetic layers each having a granular structure in which grain boundary parts each comprising non-magnetic substance are formed between crystal grains grown in columnar shapes. Assuming that the average grain size of the crystal grains in the first magnetic recording layer (122a) is A nm and that the average grain size of the crystal grains in the second magnetic recording layer (122b) is B nm, A is smaller than B.

Classes IPC  ?

• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/851 - Revêtement d'un support avec une couche magnétique par pulvérisation cathodique

Abrégé

Provided are a vertical magnetic recording medium and a method for making the vertical magnetic recording medium wherein the separations between the crystal grains of a first magnetic recording layer are so designed as to allow the vertical magnetic recording medium to have continuous layers exhibiting a function as of continuous layers. First and second magnetic recording layers (122a, 122b) of a vertical magnetic recording medium (100) are ferromagnetic layers each having a granular structure in which grain boundary parts each comprising non-magnetic substance are formed between crystal grains grown in columnar shapes. The inter-grain distance, which is defined by the average of the shortest distances between the grain boundary parts between mutually adjacent crystal grains in the first magnetic recording layer (122a), is equal to or less than 1 nm.

Classes IPC  ?

• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/851 - Revêtement d'un support avec une couche magnétique par pulvérisation cathodique

Abrégé

Provided is a method for manufacturing a magnetic recording medium having a high recording density. Since a nonmagnetic section (8) is formed in a prescribed pattern on an auxiliary recording layer (4) formed on a magnetic recording layer (3), the magnetic recording medium, which has a magnetic section (7) and a magnetic recording layer (3) directly under the magnetic section as recording unit, is provided. Since the nonmagnetic section (8) is formed by demagnetization by ion implantation, the magnetic recording medium having a high recording density can be manufactured.

Classes IPC  ?

• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/85 - Revêtement d'un support avec une couche magnétique par dépôt en phase vapeur

Abrégé

Provided is a magnetic recording medium which can reduce the spacing loss and exhibit a preferable magnetic recording and reproduction characteristic. Provided is also a method for manufacturing the magnetic recording medium. The method manufactures a magnetic recording medium including: a magnetic recording layer of the granular structure having a non-magnetic grain boundary between columnar magnetic grains on a non-magnetic substrate; and an exchange coupling layer arranged on the magnetic recording layer so as to provide a function of exchange coupling between the magnetic grains. The method includes an ion applying step for applying ions to the entire surface of the exchange coupling layer after layering the exchange coupling layer on the magnetic recording layer.

Classes IPC  ?

• G11B 5/85 - Revêtement d'un support avec une couche magnétique par dépôt en phase vapeur
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition