Classifications

• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
  • G11B5/62—Record carriers characterised by the selection of the material
  • G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
  • G11B5/66—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers
  • G11B5/672—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers having different compositions in a plurality of magnetic layers, e.g. layer compositions having differing elemental components or differing proportions of elements
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S428/00—Stock material or miscellaneous articles
  • Y10S428/90—Magnetic feature
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
  • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
  • Y10T428/264—Up to 3 mils
  • Y10T428/265—1 mil or less
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31678—Of metal

Definitions

• the present invention relates to a magnetic recording medium, in particular, a so-called thin-film magnetic recording medium in which a metal magnetic layer is formed on a non-magnetic substrate, and particularly to the durability of the metal magnetic layer such as adhesion and abrasion resistance. It will be improved.
• a discontinuous film made of a dissimilar metal such as A.sub.1 and T.sub.i or an organic material is interposed between the nonmagnetic substrate and the metal magnetic layer. Attempts were made to increase the adhesion of the metal magnetic layer, but this was not satisfactory enough.
• At least one surface of the nonmagnetic substrate has a metal layer whose surface has been changed, nitrided or carbonized, and a metal magnetic layer has been formed thereon.
• the durability of the metal magnetic layer in the magnetic recording medium is improved (increased by a factor of 10 to 10 times), and this type of highly reliable magnetic recording; Can be provided.
• 1 to 5 are new front views showing an example of a magnetic recording medium according to the present invention.
• a non-magnetic base material i.e., a polyethylene terephthalate base (1) is first prepared and the base (1) is used.
• Activation of this for example a low pressure atmosphere containing oxygen gas (to generate plasma of O Ri ambient gas co ⁇ na discharge vacuum 1 0- 1 ⁇ 1 0 torr :) , in this flop plasma Go.
• a mixed gas of Ar70 and 0230%, and an atmosphere of 02 gas pressure of 10 torr (hereinafter referred to as atmosphere (a)
• atmosphere (a) the atmosphere gas used in the activation treatment is not limited to the gas containing the iodine, but may be any gas such as argon gas.
• a cobalt discontinuous discontinuous film or island ⁇ : minute (2) Is formed by a method such as vapor deposition or sputtering.
• the average film thickness of the island-shaped portion (2) is 10 to about LO 0 A, and in this example, about 300.
• a £, Ti, etc. can be used in addition to Co, but Co is the most preferable. This is because the composition is the same as the composition of the metal magnetic layer formed after II, so that only one evaporation source is required and the productivity is improved.
• Either vertical vapor deposition or oblique vapor deposition may be used as the vapor deposition method, but oblique vapor deposition is easier to form into an island shape.
• an oxidizing atmosphere a gas containing 02 gas, for example, a gas containing from pure 02 gas to about 20 gas containing 02 gas (the remainder is an inert gas)
• a nitriding atmosphere a gas containing the inert gas.
• a plasma is generated by applying a DC voltage to this atmosphere gas.
• the surface or the entire interior of the island-shaped portion (2) is converted into nitride, nitride or carbide (3).
• the plasma conditions introducing a gas pressure of 1 0 one 1 to 0 one 4 torr of the atmosphere gas, the applied voltage and the number 1 0 0 V to several 1 0 0 0 V.
• the plasma generated in the oxygen-containing atmosphere (a) is used to form a cobalt oxide (3) on the surface of the island (2) of the cobalt. .
• a metal beat, nitride or carbide is deposited in a beating atmosphere, a nitriding atmosphere or a carbonizing atmosphere by a reactive ion plating method or an activated reactive deposition method. It can also be formed as an island (2).
• a metal magnetic layer (4) is deposited on the main surface (1A) of the base (1) including the island-shaped portion (2) by means such as vapor deposition and sputtering.
• the metal layer (4) there may be used, for example,
• Nickel containing a small amount of iron can be used.
• the thickness of the metal magnetic layer (4) is from 700 to 200, and in this example, 150 O'A And formed by oblique evaporation.
• the outermost surface of the metallic conductive layer (4) is subjected to plasma treatment to form a layer (5) of nitride, nitride or carbide.
• the oxide layer (5) is formed on the surface of the metal magnetic layer (4) by treatment with the plasma generated in the atmosphere (i) containing i.
• the base in this case, a tabular shape
• the vapor deposition element is used for each of the deposition limits. Move the base (1) over the required angle so that the angle of incidence ⁇ on the angle ⁇ is constant.

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• Magnetic Record Carriers (AREA)
• Manufacturing Of Magnetic Record Carriers (AREA)

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Applications Claiming Priority (2)

Publications (1)

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Citations (3)

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• 1981
  • 1981-05-22 JP JP56077539A patent/JPS57191830A/ja active Granted
• 1982
  • 1982-05-21 EP EP82901533A patent/EP0079391B1/en not_active Expired
  • 1982-05-21 NL NL8220164A patent/NL8220164A/nl not_active Application Discontinuation
  • 1982-05-21 GB GB08301832A patent/GB2113898B/en not_active Expired
  • 1982-05-21 US US06/459,602 patent/US4696862A/en not_active Expired - Lifetime
  • 1982-05-21 WO PCT/JP1982/000185 patent/WO1982004158A1/ja not_active Ceased

Patent Citations (3)

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