JPH0147882B2 - - Google Patents

Info

Publication number
JPH0147882B2
JPH0147882B2 JP56117363A JP11736381A JPH0147882B2 JP H0147882 B2 JPH0147882 B2 JP H0147882B2 JP 56117363 A JP56117363 A JP 56117363A JP 11736381 A JP11736381 A JP 11736381A JP H0147882 B2 JPH0147882 B2 JP H0147882B2
Authority
JP
Japan
Prior art keywords
iron oxide
cobalt
temperature
magnetite
acicular
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.)
Expired
Application number
JP56117363A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5818904A (ja
Inventor
Tsuneo Ishikawa
Ichiro Pponma
Masaharu Hirai
Makoto Ogasawara
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.)
Ishihara Sangyo Kaisha Ltd
Original Assignee
Ishihara Sangyo Kaisha 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 Ishihara Sangyo Kaisha Ltd filed Critical Ishihara Sangyo Kaisha Ltd
Priority to JP56117363A priority Critical patent/JPS5818904A/ja
Publication of JPS5818904A publication Critical patent/JPS5818904A/ja
Publication of JPH0147882B2 publication Critical patent/JPH0147882B2/ja
Granted 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
    • G11B5/706—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 the composition of the magnetic material
    • G11B5/70626—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 the composition of the magnetic material containing non-metallic substances
    • G11B5/70642—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 the composition of the magnetic material containing non-metallic substances iron oxides
    • G11B5/70652—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 the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3
    • G11B5/70668—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 the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3 containing a dopant
    • G11B5/70673—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 the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3 containing a dopant containing Co

Landscapes

  • Compounds Of Iron (AREA)
  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)
  • Hard Magnetic Materials (AREA)
JP56117363A 1981-07-27 1981-07-27 コバルト含有磁性酸化鉄の製造方法 Granted JPS5818904A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56117363A JPS5818904A (ja) 1981-07-27 1981-07-27 コバルト含有磁性酸化鉄の製造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56117363A JPS5818904A (ja) 1981-07-27 1981-07-27 コバルト含有磁性酸化鉄の製造方法

Publications (2)

Publication Number Publication Date
JPS5818904A JPS5818904A (ja) 1983-02-03
JPH0147882B2 true JPH0147882B2 (en]) 1989-10-17

Family

ID=14709811

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56117363A Granted JPS5818904A (ja) 1981-07-27 1981-07-27 コバルト含有磁性酸化鉄の製造方法

Country Status (1)

Country Link
JP (1) JPS5818904A (en])

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59147414A (ja) * 1983-02-10 1984-08-23 Ishihara Sangyo Kaisha Ltd コバルト含有磁性酸化鉄粉末の製造方法

Also Published As

Publication number Publication date
JPS5818904A (ja) 1983-02-03

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