GB2001942B - Methods of making magnetic powders and magnetic recording media including magnetic powders so made - Google Patents

Methods of making magnetic powders and magnetic recording media including magnetic powders so made

Info

Publication number
GB2001942B
GB2001942B GB7828792A GB7828792A GB2001942B GB 2001942 B GB2001942 B GB 2001942B GB 7828792 A GB7828792 A GB 7828792A GB 7828792 A GB7828792 A GB 7828792A GB 2001942 B GB2001942 B GB 2001942B
Authority
GB
United Kingdom
Prior art keywords
magnetic
magnetic powders
methods
powders
recording media
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.)
Expired
Application number
GB7828792A
Other versions
GB2001942A (en
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of GB2001942A publication Critical patent/GB2001942A/en
Application granted granted Critical
Publication of GB2001942B publication Critical patent/GB2001942B/en
Expired 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
    • G11B5/712—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 surface treatment or coating of magnetic particles
    • 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
GB7828792A 1977-07-04 1978-07-04 Methods of making magnetic powders and magnetic recording media including magnetic powders so made Expired GB2001942B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7964577A JPS5413997A (en) 1977-07-04 1977-07-04 Magnetic recording medium and its manufacture

Publications (2)

Publication Number Publication Date
GB2001942A GB2001942A (en) 1979-02-14
GB2001942B true GB2001942B (en) 1982-02-03

Family

ID=13695840

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7828792A Expired GB2001942B (en) 1977-07-04 1978-07-04 Methods of making magnetic powders and magnetic recording media including magnetic powders so made

Country Status (5)

Country Link
JP (1) JPS5413997A (en)
DE (1) DE2829344A1 (en)
FR (1) FR2397049A1 (en)
GB (1) GB2001942B (en)
NL (1) NL7807250A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2903593C3 (en) * 1979-01-31 1982-05-06 Bayer Ag, 5090 Leverkusen Cobalt-doped ferrimagnetic iron oxides and processes for their production
DE2905351A1 (en) * 1979-02-13 1980-08-21 Basf Ag METHOD FOR PRODUCING NEEDLE-SHAPED COBAL-CONTAINING, MAGNETIC IRON OXIDE
DE2905352A1 (en) * 1979-02-13 1980-08-21 Basf Ag METHOD FOR PRODUCING NEEDLE-SHAPED COBAL-CONTAINING MAGNETIC IRON OXIDE
EP0099259A1 (en) * 1982-07-09 1984-01-25 Konica Corporation Process for producing surface-treated ferromagnetic particles
DE3631194A1 (en) * 1986-09-13 1988-03-24 Bayer Ag MAGNETIC IRON OXIDE PIGMENTS AND METHOD FOR THE PRODUCTION THEREOF
DE3631193A1 (en) * 1986-09-13 1988-03-24 Bayer Ag MAGNETIC IRON OXIDE PIGMENTS AND METHOD FOR THE PRODUCTION THEREOF
CN103694746B (en) * 2013-12-27 2015-11-18 广东维诺珠光颜料有限公司 A kind of preparation method of multifunctional magnetic synthetic mica pearlescent pigment

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4810994B1 (en) * 1969-07-26 1973-04-09
JPS5321119B2 (en) * 1973-03-20 1978-06-30
DE2243231C2 (en) * 1972-09-01 1982-01-28 Basf Ag, 6700 Ludwigshafen Process for the preparation of cobalt-doped γ-iron (III) oxide
DE2639250C2 (en) * 1976-09-01 1985-12-12 Basf Ag, 6700 Ludwigshafen Process for the production of acicular, cobalt-doped magnetic iron oxide
DE2705967C2 (en) * 1977-02-12 1990-01-04 Basf Ag, 6700 Ludwigshafen Process for the production of acicular cobalt-containing magnetic iron oxide

Also Published As

Publication number Publication date
JPS5413997A (en) 1979-02-01
FR2397049B1 (en) 1982-04-02
DE2829344A1 (en) 1979-01-25
NL7807250A (en) 1979-01-08
GB2001942A (en) 1979-02-14
FR2397049A1 (en) 1979-02-02
DE2829344C2 (en) 1989-03-02
JPS6114642B2 (en) 1986-04-19

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940704