JPS57183631A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57183631A
JPS57183631A JP6830881A JP6830881A JPS57183631A JP S57183631 A JPS57183631 A JP S57183631A JP 6830881 A JP6830881 A JP 6830881A JP 6830881 A JP6830881 A JP 6830881A JP S57183631 A JPS57183631 A JP S57183631A
Authority
JP
Japan
Prior art keywords
film
magnetic
disk
metallic
gamma
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6830881A
Other languages
Japanese (ja)
Inventor
Kazuo Shirohashi
Katsuyoshi Tamura
Hiromi Kanai
Kozo Odawara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6830881A priority Critical patent/JPS57183631A/en
Publication of JPS57183631A publication Critical patent/JPS57183631A/en
Pending legal-status Critical Current

Links

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
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/716—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by two or more magnetic layers

Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To obtain a magnetic disk having high coercive force which is especially suited to a magnetic encoder, etc., by laminating a metallic film using a polyurethane binder and a gamma-Fe2O3 film using an epoxy binder on a nonmagnetic substrate. CONSTITUTION:A gamma-Fe2O3 magnetic film 2 using an epoxy resin binder is formed on a nonmagnetic substrate such as an Al disk substrate 1, and a metallic magnetic film 3 using the Fe powder and a polyurethane binder is formed on the film 2. Then a gamma-Fe2O3 film 4 is formed on the film 3 with the same composition and with the same method as the film 2 to obtain a laminated magnetic film 5. The film 2 is formed to increase the adhesion properties between the substrate and the metallic film. And it causes no problem if the metallic film 3 is formed directly without using the film 2. 50-80% Fe powder is filled into the film 3 to ensure a high coercive force. The film 4 functions to prevent the oxidation of the Fe powder of the film 3. In such a way, a disk having a thick magnetic recording layer is obtained to be suitably applied to a magnetic encoder which requires a large space between the magnetic head and the disk.
JP6830881A 1981-05-08 1981-05-08 Magnetic recording medium Pending JPS57183631A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6830881A JPS57183631A (en) 1981-05-08 1981-05-08 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6830881A JPS57183631A (en) 1981-05-08 1981-05-08 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS57183631A true JPS57183631A (en) 1982-11-12

Family

ID=13370036

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6830881A Pending JPS57183631A (en) 1981-05-08 1981-05-08 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57183631A (en)

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