JPS4969588A - - Google Patents
Info
- Publication number
- JPS4969588A JPS4969588A JP48096786A JP9678673A JPS4969588A JP S4969588 A JPS4969588 A JP S4969588A JP 48096786 A JP48096786 A JP 48096786A JP 9678673 A JP9678673 A JP 9678673A JP S4969588 A JPS4969588 A JP S4969588A
- 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.)
- Granted
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)
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 true JPS4969588A (nl) | 1974-07-05 |
| JPS5737532B2 JPS5737532B2 (nl) | 1982-08-10 |
Family
ID=5855337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9678673A Expired JPS5737532B2 (nl) | 1972-09-01 | 1973-08-30 |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5737532B2 (nl) |
| DE (1) | DE2243231C2 (nl) |
| FR (1) | FR2197818B3 (nl) |
| GB (1) | GB1432643A (nl) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5413997A (en) * | 1977-07-04 | 1979-02-01 | Sony Corp | Magnetic recording medium and its manufacture |
| 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 |
| JPS59130407A (ja) * | 1978-04-12 | 1984-07-27 | バイエル・アクチエンゲゼルシヤフト | 磁気信号記録用針状フエリ磁性酸化鉄粒子 |
| JPS6187302A (ja) * | 1985-10-18 | 1986-05-02 | Sony Corp | 磁気記録媒体の製法 |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5719049B2 (nl) * | 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 |
| DE2743298A1 (de) * | 1977-09-27 | 1979-04-05 | Basf Ag | Ferromagnetische, im wesentlichen aus eisen bestehende metallteilchen 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 |
| DE2905351A1 (de) | 1979-02-13 | 1980-08-21 | Basf Ag | Verfahren zur herstellung von nadelfoermigem kobalthaltigem, magnetischem eisenoxid |
| DE2905352A1 (de) | 1979-02-13 | 1980-08-21 | Basf Ag | Verfahren zur herstellung von nadelfoermigem kobalthaltigem magnetischem eisenoxid |
| 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 |
| 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)
| 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 |
-
1972
- 1972-09-01 DE DE19722243231 patent/DE2243231C2/de not_active Expired
-
1973
- 1973-08-30 JP JP9678673A patent/JPS5737532B2/ja not_active Expired
- 1973-08-31 GB GB4107273A patent/GB1432643A/en not_active Expired
- 1973-09-03 FR FR7331734A patent/FR2197818B3/fr not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5413997A (en) * | 1977-07-04 | 1979-02-01 | Sony Corp | Magnetic recording medium and its manufacture |
| JPS6114642B2 (nl) * | 1977-07-04 | 1986-04-19 | Sony Corp | |
| JPS59130407A (ja) * | 1978-04-12 | 1984-07-27 | バイエル・アクチエンゲゼルシヤフト | 磁気信号記録用針状フエリ磁性酸化鉄粒子 |
| JPH0126164B2 (nl) * | 1978-04-12 | 1989-05-22 | Bayer Ag | |
| JPS55149137A (en) * | 1979-05-11 | 1980-11-20 | Tdk Corp | High performance high coercive force powder and its manufacture |
| JPS6348810B2 (nl) * | 1979-05-11 | 1988-09-30 | Tdk Electronics Co Ltd | |
| 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 |
| JPS6250889B2 (nl) * | 1981-07-28 | 1987-10-27 | Tokyo Shibaura Electric Co | |
| JPS6187302A (ja) * | 1985-10-18 | 1986-05-02 | Sony Corp | 磁気記録媒体の製法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5737532B2 (nl) | 1982-08-10 |
| FR2197818B3 (nl) | 1976-08-06 |
| DE2243231C2 (de) | 1982-01-28 |
| GB1432643A (en) | 1976-04-22 |
| DE2243231A1 (de) | 1974-03-21 |
| FR2197818A1 (nl) | 1974-03-29 |