BE798806A - Oxyde de fer ferrimagnetique aciculaire contenant du cobalt dont la stabilite de la remanence est amelioree et procede de sa preparation - Google Patents

Oxyde de fer ferrimagnetique aciculaire contenant du cobalt dont la stabilite de la remanence est amelioree et procede de sa preparation

Info

Publication number
BE798806A
BE798806A BE130484A BE130484A BE798806A BE 798806 A BE798806 A BE 798806A BE 130484 A BE130484 A BE 130484A BE 130484 A BE130484 A BE 130484A BE 798806 A BE798806 A BE 798806A
Authority
BE
Belgium
Prior art keywords
remanence
preparation
improved
iron oxide
oxide containing
Prior art date
Application number
BE130484A
Other languages
English (en)
French (fr)
Original Assignee
Bayer Ag
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
Priority claimed from DE19722221218 external-priority patent/DE2221218C3/de
Application filed by Bayer Ag filed Critical Bayer Ag
Publication of BE798806A publication Critical patent/BE798806A/xx

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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • C01G49/08—Ferroso-ferric oxide [Fe3O4]
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/50—Solid solutions
    • C01P2002/52—Solid solutions containing elements as dopants
    • C01P2002/54—Solid solutions containing elements as dopants one element only
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/42—Magnetic properties

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
BE130484A 1972-04-29 1973-04-27 Oxyde de fer ferrimagnetique aciculaire contenant du cobalt dont la stabilite de la remanence est amelioree et procede de sa preparation BE798806A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722221218 DE2221218C3 (de) 1972-04-29 Verfahren zur Herstellung cobalthaltiger nadeiförmiger ferrimagnetischer Eisenoxide mit verringertem Remanenzverlust bei thermischer Belastung

Publications (1)

Publication Number Publication Date
BE798806A true BE798806A (fr) 1973-10-29

Family

ID=5843697

Family Applications (1)

Application Number Title Priority Date Filing Date
BE130484A BE798806A (fr) 1972-04-29 1973-04-27 Oxyde de fer ferrimagnetique aciculaire contenant du cobalt dont la stabilite de la remanence est amelioree et procede de sa preparation

Country Status (9)

Country Link
US (1) US3897354A (cs)
JP (1) JPS5228120B2 (cs)
BE (1) BE798806A (cs)
CA (1) CA1007444A (cs)
FR (1) FR2183051B1 (cs)
GB (1) GB1404096A (cs)
IT (1) IT989547B (cs)
NL (1) NL7305959A (cs)
PL (1) PL85507B1 (cs)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052326A (en) * 1973-10-19 1977-10-04 Basf Aktiengesellschaft Manufacture of γ-iron(III) oxide
JPS5310279B2 (cs) * 1974-03-01 1978-04-12
US3994819A (en) * 1974-09-13 1976-11-30 Agence Nationale De Valorisation De La Recherche (Anvar) Method for the preparation of acicular particles containing iron and other divalent metals
DE2520643C2 (de) * 1975-05-09 1983-11-17 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von γ-Eisen(III)oxid
US4086174A (en) * 1976-01-13 1978-04-25 Pfizer Inc. Cobalt modified acicular γ ferric oxide and process for preparing the same
DE2805405A1 (de) * 1978-02-09 1979-08-16 Basf Ag Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden
DE2805621A1 (de) * 1978-02-10 1979-08-23 Basf Ag Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden
US4226909A (en) * 1978-08-21 1980-10-07 Minnesota Mining And Manufacturing Company Cobalt-doped acicular hyper-magnetite particles
JPS5852806A (ja) * 1981-09-24 1983-03-29 Hitachi Maxell Ltd 磁気記録媒体
JPS60137002A (ja) * 1983-12-26 1985-07-20 Toda Kogyo Corp 磁気記録用板状Ｂａフエライト微粒子粉末の製造法
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
US4770951A (en) * 1985-08-16 1988-09-13 Graham Magnetics, Inc. Magnetic flexible disks
DE4319572A1 (de) * 1993-06-14 1994-12-15 Toda Kogyo Corp Co-haltige Eisenoxidpigmente, Verfahren zu ihrer Herstellung und diese enthaltende magnetische Medien
CN115472414B (zh) * 2022-09-05 2025-06-27 宁波中益赛威新材料有限公司 一种铁基纳米晶磁芯及其制备方法

Family Cites Families (1)

* 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

Also Published As

Publication number Publication date
PL85507B1 (cs) 1976-04-30
JPS4941300A (cs) 1974-04-18
NL7305959A (cs) 1973-10-31
IT989547B (it) 1975-06-10
GB1404096A (en) 1975-08-28
DE2221218B2 (de) 1975-12-18
DE2221218A1 (de) 1973-10-31
US3897354A (en) 1975-07-29
JPS5228120B2 (cs) 1977-07-25
FR2183051A1 (cs) 1973-12-14
CA1007444A (en) 1977-03-29
FR2183051B1 (cs) 1976-03-05

Similar Documents

Publication Publication Date Title
BE798806A (fr) Oxyde de fer ferrimagnetique aciculaire contenant du cobalt dont la stabilite de la remanence est amelioree et procede de sa preparation
BE795896A (fr) Materiau pour l'enregistrement magnetique a plusieurs couches et son procede de preparation
IT976964B (it) Procedimento per produrre ossidi di ferro magnetici aciculari ed elemento di memoria che li contiene
BE804294A (fr) Transducteur magnetique magnetoresistif interieurement polarise et son procede de fabrication
BE807177A (fr) Procede de fabrication de disques d'enregistrements magnetiques
IT973717B (it) Procedimento per la produzione di particelle di ferro aciculari stabili e magnetiche
IT962229B (it) Perfezionamento nei nastri magne tici per registrazioni video e procedimento di produzione
BE798227A (fr) Matiere d'enregistrement magnetique et procede de fabrication
BE798807A (fr) Oxyde de fer ferrimagnetique aciculaire contenant du cobalt et de l'oxyde de silicium et procede de sa preparation
BE783370A (fr) Procede et appareillage d'evaporateurs a effets
FR2336091A1 (fr) Preparations stables, seches, versables, contenant de l'acide ascorbique ou l'un de ses sels, et leur procede de fabrication
BE795417A (fr) Nouveaux composes d'origine-bacterienne et procede d'obtention
BE815266A (fr) Production d'oxydes de fer ferrimagnetiques aciculaires contenant du cobalt
BE798017A (fr) Procede et appareil d'analyse des roches meres
BE801184A (fr) Transducteurs magnetiques perfectionnes et leur procede de fabrication
BE751803A (fr) Procede de fabrication de couches magnetiques cylindriques pourl'enregistrement
CA1012868A (en) Magnetic device having a magneto-optical medium and method of manufacturing same
CA992203A (en) Skewed high density magnetic head and method of manufacturing same
AT354531B (de) Vorrichtung zur magnetischen aufzeichnung und wiedergabe von videosignalen
AU469246B2 (en) Improvements in or relating to magnetic transducers and to methods of manufacture thereof
BE787702A (fr) Procede d'enregistrement et de lecture
CA902968A (en) Method of making acicular cobalt-modified maghemite powder
BE808426A (fr) Procede de fabrication de preparations et d'extraits contenant des allergenes
AT354125B (de) Vorrichtung zur speicherung und bereitstellung von magnetbandkassetten
CA939478A (en) Asphaltites in medium density board and method of making

Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: BAYER A.G.

Effective date: 19920430