IT994755B - Polvere magnetica di ossido ferrico cobalto sostituito e metodo per prepararla - Google Patents
Polvere magnetica di ossido ferrico cobalto sostituito e metodo per prepararlaInfo
- Publication number
- IT994755B IT994755B IT52339/73A IT5233973A IT994755B IT 994755 B IT994755 B IT 994755B IT 52339/73 A IT52339/73 A IT 52339/73A IT 5233973 A IT5233973 A IT 5233973A IT 994755 B IT994755 B IT 994755B
- Authority
- IT
- Italy
- Prior art keywords
- substituted
- preparing
- magnetic powder
- cobalt oxide
- ferric
- Prior art date
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
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9022972A JPS5411919B2 (it) | 1972-09-07 | 1972-09-07 | |
JP9023272A JPS5326316B2 (it) | 1972-09-07 | 1972-09-07 | |
JP9023172A JPS5326315B2 (it) | 1972-09-07 | 1972-09-07 | |
JP9023072A JPS5326314B2 (it) | 1972-09-07 | 1972-09-07 | |
JP9023372A JPS5326317B2 (it) | 1972-09-07 | 1972-09-07 | |
JP9024472A JPS5326318B2 (it) | 1972-09-07 | 1972-09-07 | |
JP9477572A JPS5326320B2 (it) | 1972-09-20 | 1972-09-20 | |
JP9477372A JPS5326319B2 (it) | 1972-09-20 | 1972-09-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
IT994755B true IT994755B (it) | 1975-10-20 |
Family
ID=27572839
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT52339/73A IT994755B (it) | 1972-09-07 | 1973-09-05 | Polvere magnetica di ossido ferrico cobalto sostituito e metodo per prepararla |
Country Status (5)
Country | Link |
---|---|
US (1) | US3903004A (it) |
CA (1) | CA1030751A (it) |
DE (1) | DE2345375A1 (it) |
GB (1) | GB1429250A (it) |
IT (1) | IT994755B (it) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2434096C2 (de) * | 1974-07-16 | 1985-10-17 | Basf Ag, 6700 Ludwigshafen | Nadelförmige, vorwiegend aus Eisen bestehende ferromagnetische Metallteilchen und Verfahren zu ihrer Herstellung |
GB1568853A (en) * | 1976-03-16 | 1980-06-04 | Fujitsu Ltd | Magnetic recoding medium and process for producing the same |
JPS5329703A (en) * | 1976-09-01 | 1978-03-20 | Fujitsu Ltd | Production of thin magnetic film |
DE2916403A1 (de) * | 1979-04-23 | 1980-11-06 | Basf Ag | Nadelfoermiges magnetisches eisenoxid und verfahren zu seiner herstellung |
DE3029203A1 (de) * | 1980-08-01 | 1982-04-01 | Basf Ag, 6700 Ludwigshafen | Nadelfoermiges magnetisches eisenoxid und verfahren zu seiner herstellung |
JPS5819733A (ja) * | 1981-07-28 | 1983-02-04 | Toshiba Corp | 磁気記録媒体及びその製造方法 |
DE3204547A1 (de) * | 1982-02-10 | 1983-08-18 | Basf Ag, 6700 Ludwigshafen | Nadelfoermiges ferrimagnetisches eisenoxid und verfahren zu seiner herstellung |
US4544612A (en) * | 1982-09-22 | 1985-10-01 | Nippon Telegraph & Telephone Public Corporation | Iron oxide magnetic film and process for fabrication thereof |
JPS62108737A (ja) * | 1985-11-08 | 1987-05-20 | Fuji Photo Film Co Ltd | 強磁性酸化鉄粉末の製造方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3075919A (en) * | 1959-08-21 | 1963-01-29 | Basf Ag | Process for the production of acicular gamma-iron (iii) oxide |
US3399142A (en) * | 1963-10-02 | 1968-08-27 | Georgia Kaolin Co | Magnetic materials and methods of making the same |
-
1973
- 1973-08-28 CA CA179,836A patent/CA1030751A/en not_active Expired
- 1973-09-05 GB GB4183873A patent/GB1429250A/en not_active Expired
- 1973-09-05 IT IT52339/73A patent/IT994755B/it active
- 1973-09-06 DE DE19732345375 patent/DE2345375A1/de active Pending
- 1973-09-07 US US394998A patent/US3903004A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE2345375A1 (de) | 1974-03-14 |
GB1429250A (en) | 1976-03-24 |
US3903004A (en) | 1975-09-02 |
CA1030751A (en) | 1978-05-09 |
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