FR2369998B1 - - Google Patents
Info
- Publication number
- FR2369998B1 FR2369998B1 FR7733181A FR7733181A FR2369998B1 FR 2369998 B1 FR2369998 B1 FR 2369998B1 FR 7733181 A FR7733181 A FR 7733181A FR 7733181 A FR7733181 A FR 7733181A FR 2369998 B1 FR2369998 B1 FR 2369998B1
- Authority
- FR
- France
- 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
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 (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762650890 DE2650890C2 (de) | 1976-11-06 | 1976-11-06 | Verfahren zur Herstellung von nadelförmigem, kobaltdotiertem, magnetischem Eisenoxid |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2369998A1 FR2369998A1 (fr) | 1978-06-02 |
FR2369998B1 true FR2369998B1 (de) | 1981-10-16 |
Family
ID=5992614
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7733181A Granted FR2369998A1 (fr) | 1976-11-06 | 1977-11-04 | Oxyde de fer magnetique aciculaire dope par du cobalt et son procede de preparation |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPS5358497A (de) |
DE (1) | DE2650890C2 (de) |
FR (1) | FR2369998A1 (de) |
GB (1) | GB1589355A (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4276183A (en) * | 1978-10-25 | 1981-06-30 | Pfizer Inc. | Cobalt modified magnetic iron oxide |
DE3044340A1 (de) | 1980-11-25 | 1982-06-24 | Basf Ag, 6700 Ludwigshafen | Verfahren zur herstellung von hochkoerzitivem nadelfoermigem gamma-eisen(iii)oxid |
AU548794B2 (en) | 1981-07-28 | 1986-01-02 | Ishihara Sangyo Kaisha Ltd. | Process for producing cobalt containing ferromagnetic iron oxides |
US4521372A (en) * | 1981-08-26 | 1985-06-04 | Nuclear Monitoring Systems & Management Corporation | Apparatus and method for monitoring stored material |
EP0076462B2 (de) * | 1981-10-01 | 1991-01-16 | Agency Of Industrial Science And Technology | Verfahren zur Herstellung magnetischer Teilchen |
DE3616096A1 (de) * | 1986-05-13 | 1987-11-19 | Basf Ag | Verfahren zur herstellung kobalthaltiger, nadelfoermiger, magnetischer eisenoxide |
DE3631193A1 (de) * | 1986-09-13 | 1988-03-24 | Bayer Ag | Magnetische eisenoxidpigmente und verfahren zu ihrer herstellung |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3262812A (en) * | 1964-03-26 | 1966-07-26 | Gen Electric | Magnetic recording tape with magnetic layer of oxide coated iron-cobalt alloy particles in a binder |
US3573980A (en) * | 1968-02-19 | 1971-04-06 | Minnesota Mining & Mfg | Method of making magnetic particles and recording tape |
JPS4810994B1 (de) * | 1969-07-26 | 1973-04-09 | ||
BE790376A (fr) * | 1971-10-27 | 1973-02-15 | Ampex | Particules d'oxyde de fer magnétique dopé au cobalt |
NL180000C (nl) * | 1972-04-21 | 1986-12-16 | Anvar | Werkwijze voor de bereiding van een fijnverdeeld poeder uit een vaste oplossing van met een of meer tweewaardige metalen gesubstitueerd gamma-feÿ2oÿ3. |
-
1976
- 1976-11-06 DE DE19762650890 patent/DE2650890C2/de not_active Expired
-
1977
- 1977-11-02 JP JP13090777A patent/JPS5358497A/ja active Pending
- 1977-11-04 GB GB4591577A patent/GB1589355A/en not_active Expired
- 1977-11-04 FR FR7733181A patent/FR2369998A1/fr active Granted
Also Published As
Publication number | Publication date |
---|---|
DE2650890C2 (de) | 1985-12-12 |
GB1589355A (en) | 1981-05-13 |
DE2650890A1 (de) | 1978-05-11 |
JPS5358497A (en) | 1978-05-26 |
FR2369998A1 (fr) | 1978-06-02 |