FR2363521A1 - Oxyde de fer magnetique aciculaire, dope au cobalt, et procede de preparation de cet oxyde - Google Patents

Oxyde de fer magnetique aciculaire, dope au cobalt, et procede de preparation de cet oxyde

Info

Publication number
FR2363521A1
FR2363521A1 FR7726206A FR7726206A FR2363521A1 FR 2363521 A1 FR2363521 A1 FR 2363521A1 FR 7726206 A FR7726206 A FR 7726206A FR 7726206 A FR7726206 A FR 7726206A FR 2363521 A1 FR2363521 A1 FR 2363521A1
Authority
FR
France
Prior art keywords
oxide
preparation
magnetic iron
iron
degrees
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.)
Granted
Application number
FR7726206A
Other languages
English (en)
Other versions
FR2363521B1 (fr
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of FR2363521A1 publication Critical patent/FR2363521A1/fr
Application granted granted Critical
Publication of FR2363521B1 publication Critical patent/FR2363521B1/fr
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)
  • Hard Magnetic Materials (AREA)

Abstract

La présente invention concerne un oxyde de fer-III- gamma modifié au cobalt, renfermant du fer bivalent, présentant une teneur en cobalt comprise entre 0,5 et 10 %, rapportée au poids de l'oxyde de fer-III. L'oxyde de fer-III- gamma selon l'invention renferme 1,2 à 18 % en poids de fer bivalent et présente une valeur DT inférieure à 2,5, DT désignant la somme des rapports entre la coercitivité à -100 degrés C et celle à + 25 degrés C et entre la rémanence relative MR /MS à -100 degrés C et celle à + 25 degrés C.
FR7726206A 1976-09-01 1977-08-29 Oxyde de fer magnetique aciculaire, dope au cobalt, et procede de preparation de cet oxyde Granted FR2363521A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762639250 DE2639250C2 (de) 1976-09-01 1976-09-01 Verfahren zur Herstellung von nadelförmigem, kobaltdotiertem magnetischem Eisenoxid

Publications (2)

Publication Number Publication Date
FR2363521A1 true FR2363521A1 (fr) 1978-03-31
FR2363521B1 FR2363521B1 (fr) 1981-08-21

Family

ID=5986842

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7726206A Granted FR2363521A1 (fr) 1976-09-01 1977-08-29 Oxyde de fer magnetique aciculaire, dope au cobalt, et procede de preparation de cet oxyde

Country Status (6)

Country Link
JP (1) JPS5330497A (fr)
BE (1) BE858222A (fr)
DE (1) DE2639250C2 (fr)
FR (1) FR2363521A1 (fr)
GB (1) GB1583256A (fr)
NL (1) NL7709413A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2387912A1 (fr) * 1977-04-20 1978-11-17 Hitachi Maxell Particules magnetiques d'oxyde de fer contenant du cobalt et leur procede de preparation

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4558411A (en) * 1969-05-19 1985-12-10 Burroughs Corp. Polymorphic programmable units employing plural levels of sub-instruction sets
JPS5413997A (en) * 1977-07-04 1979-02-01 Sony Corp Magnetic recording medium and its manufacture
JPS589453B1 (fr) * 1978-03-17 1983-02-21 Burroughs Corp
US4209412A (en) * 1978-05-22 1980-06-24 Hercules Incorporated Process for producing nonstoichiometric ferroso-ferric oxides
JPS5864221A (ja) * 1981-10-09 1983-04-16 Ishihara Sangyo Kaisha Ltd コバルト被着強磁性酸化鉄の製造方法
DE3413752A1 (de) * 1984-04-12 1985-10-24 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung isotroper magnetischer, kobalthaltiger eisenoxide
JPS6117221A (ja) * 1984-06-25 1986-01-25 Konishiroku Photo Ind Co Ltd 磁気記録媒体
DE3631193A1 (de) * 1986-09-13 1988-03-24 Bayer Ag Magnetische eisenoxidpigmente und verfahren zu ihrer herstellung
DE3908427A1 (de) * 1989-03-15 1990-09-20 Bayer Ag Co-haltige magnetische pigmente, verfahren zu ihrer herstellung sowie deren verwendung
DE4319572A1 (de) * 1993-06-14 1994-12-15 Toda Kogyo Corp Co-haltige Eisenoxidpigmente, Verfahren zu ihrer Herstellung und diese enthaltende magnetische Medien

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1095134A (en) * 1964-03-26 1967-12-13 Gen Electric Improvements in magnetic recording medium
FR2157896A1 (fr) * 1971-10-27 1973-06-08 Ampex
DE2320182A1 (de) * 1972-04-21 1973-10-31 Anvar Verfahren zur herstellung fester loesungen aus oxiden des eisens und zweiwertigen metallen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3573980A (en) * 1968-02-19 1971-04-06 Minnesota Mining & Mfg Method of making magnetic particles and recording tape
NL7004295A (fr) * 1969-05-07 1970-11-10

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1095134A (en) * 1964-03-26 1967-12-13 Gen Electric Improvements in magnetic recording medium
FR2157896A1 (fr) * 1971-10-27 1973-06-08 Ampex
DE2320182A1 (de) * 1972-04-21 1973-10-31 Anvar Verfahren zur herstellung fester loesungen aus oxiden des eisens und zweiwertigen metallen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2387912A1 (fr) * 1977-04-20 1978-11-17 Hitachi Maxell Particules magnetiques d'oxyde de fer contenant du cobalt et leur procede de preparation

Also Published As

Publication number Publication date
BE858222A (fr) 1978-02-28
JPS5330497A (en) 1978-03-22
DE2639250A1 (de) 1978-03-09
FR2363521B1 (fr) 1981-08-21
NL7709413A (nl) 1978-03-03
DE2639250C2 (de) 1985-12-12
GB1583256A (en) 1981-01-21

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Legal Events

Date Code Title Description
ST Notification of lapse