JPS5737532B2 - - Google Patents

Info

Publication number
JPS5737532B2
JPS5737532B2 JP9678673A JP9678673A JPS5737532B2 JP S5737532 B2 JPS5737532 B2 JP S5737532B2 JP 9678673 A JP9678673 A JP 9678673A JP 9678673 A JP9678673 A JP 9678673A JP S5737532 B2 JPS5737532 B2 JP S5737532B2
Authority
JP
Japan
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
JP9678673A
Other languages
Japanese (ja)
Other versions
JPS4969588A (enrdf_load_stackoverflow
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 filed Critical
Publication of JPS4969588A publication Critical patent/JPS4969588A/ja
Publication of JPS5737532B2 publication Critical patent/JPS5737532B2/ja
Expired 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
    • 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
    • G11B5/70663—Preparation processes specially adapted therefor, e.g. using stabilising agents

Landscapes

  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)
JP9678673A 1972-09-01 1973-08-30 Expired JPS5737532B2 (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722243231 DE2243231C2 (de) 1972-09-01 1972-09-01 Verfahren zur Herstellung von Cobalt-dotiertem γ-Eisen(III)oxid

Publications (2)

Publication Number Publication Date
JPS4969588A JPS4969588A (enrdf_load_stackoverflow) 1974-07-05
JPS5737532B2 true JPS5737532B2 (enrdf_load_stackoverflow) 1982-08-10

Family

ID=5855337

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9678673A Expired JPS5737532B2 (enrdf_load_stackoverflow) 1972-09-01 1973-08-30

Country Status (4)

Country Link
JP (1) JPS5737532B2 (enrdf_load_stackoverflow)
DE (1) DE2243231C2 (enrdf_load_stackoverflow)
FR (1) FR2197818B3 (enrdf_load_stackoverflow)
GB (1) GB1432643A (enrdf_load_stackoverflow)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5719049B2 (enrdf_load_stackoverflow) * 1974-06-13 1982-04-20
DE2625106C2 (de) * 1976-06-04 1982-03-11 Bayer Ag, 5090 Leverkusen Eisenoxidschwarz-Pigmente mit verbesserter Oxidationsbeständigkeit und Verfahren zu ihrer Herstellung
DE2705967C2 (de) * 1977-02-12 1990-01-04 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadelförmigem kobalthaltigem magnetischem Eisenoxid
JPS5413997A (en) * 1977-07-04 1979-02-01 Sony Corp Magnetic recording medium and its manufacture
DE2743298A1 (de) * 1977-09-27 1979-04-05 Basf Ag Ferromagnetische, im wesentlichen aus eisen bestehende metallteilchen und verfahren zu deren herstellung
DE2815712A1 (de) * 1978-04-12 1979-10-25 Bayer Ag Eisenoxide zur magnetischen signalaufzeichnung und verfahren zu deren herstellung
US4276183A (en) * 1978-10-25 1981-06-30 Pfizer Inc. Cobalt modified magnetic iron oxide
DE2903593C3 (de) * 1979-01-31 1982-05-06 Bayer Ag, 5090 Leverkusen Kobalt-dotierte ferrimagnetische Eisenoxide und Verfahren zu deren Herstellung
DE2905352A1 (de) 1979-02-13 1980-08-21 Basf Ag Verfahren zur herstellung von nadelfoermigem kobalthaltigem magnetischem eisenoxid
DE2905351A1 (de) 1979-02-13 1980-08-21 Basf Ag Verfahren zur herstellung von nadelfoermigem kobalthaltigem, magnetischem eisenoxid
JPS55149137A (en) * 1979-05-11 1980-11-20 Tdk Corp High performance high coercive force powder and its manufacture
JPS5626729A (en) * 1979-08-11 1981-03-14 Tdk Corp Powdered magnetic material for magnetic recording medium
JPS5819733A (ja) * 1981-07-28 1983-02-04 Toshiba Corp 磁気記録媒体及びその製造方法
US4501774A (en) * 1981-10-12 1985-02-26 Ishihara Sangyo Kaisha, Ltd. Process for the production of cobalt-containing magnetic iron oxide powder
AU555302B2 (en) * 1981-12-25 1986-09-18 Ishihara Sangyo Kaisha Ltd. Cobalt containing iron oxide powder
JPS59107924A (ja) * 1982-12-08 1984-06-22 Ishihara Sangyo Kaisha Ltd コバルト含有磁性酸化鉄粉末の製造方法
DE3413752A1 (de) * 1984-04-12 1985-10-24 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung isotroper magnetischer, kobalthaltiger eisenoxide
DE3438093A1 (de) * 1984-10-18 1986-04-24 Basf Ag, 6700 Ludwigshafen Ferrimagnetische teilchen und verfahren zu ihrer herstellung
JPS6187302A (ja) * 1985-10-18 1986-05-02 Sony Corp 磁気記録媒体の製法
DE3631193A1 (de) * 1986-09-13 1988-03-24 Bayer Ag Magnetische eisenoxidpigmente und verfahren zu ihrer herstellung
DE3910782C2 (de) * 1988-12-24 2003-08-28 Toda Kogyo Corp Verfahren zur Herstellung von magnetischen Eisenoxiden und so erhaltene Pigmente

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1592214C3 (de) * 1967-11-25 1979-10-18 Agfa-Gevaert Ag, 5090 Leverkusen Verfahren zur Herstellung von magnetischem γ -Fe2 O3 durch Konvertierung von a -FeOOH-Teilchen
GB1268458A (en) * 1969-05-07 1972-03-29 Ampex Improvements in and relating to the preparation of cobalt doped gamma ferric oxide

Also Published As

Publication number Publication date
DE2243231C2 (de) 1982-01-28
FR2197818A1 (enrdf_load_stackoverflow) 1974-03-29
GB1432643A (en) 1976-04-22
FR2197818B3 (enrdf_load_stackoverflow) 1976-08-06
DE2243231A1 (de) 1974-03-21
JPS4969588A (enrdf_load_stackoverflow) 1974-07-05

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