JPS5626729A - Powdered magnetic material for magnetic recording medium - Google Patents

Powdered magnetic material for magnetic recording medium

Info

Publication number
JPS5626729A
JPS5626729A JP10264079A JP10264079A JPS5626729A JP S5626729 A JPS5626729 A JP S5626729A JP 10264079 A JP10264079 A JP 10264079A JP 10264079 A JP10264079 A JP 10264079A JP S5626729 A JPS5626729 A JP S5626729A
Authority
JP
Japan
Prior art keywords
iron oxide
oxide fine
fine particles
contg
needle crystal
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.)
Pending
Application number
JP10264079A
Other languages
English (en)
Japanese (ja)
Inventor
Haruyuki Morita
Yuichi Kubota
Yasuo Imaoka
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.)
TDK Corp
Original Assignee
TDK 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 TDK Corp filed Critical TDK Corp
Priority to JP10264079A priority Critical patent/JPS5626729A/ja
Priority to NL8004301A priority patent/NL8004301A/nl
Priority to US06/173,618 priority patent/US4321303A/en
Priority to DE19803029835 priority patent/DE3029835A1/de
Priority to GB8026104A priority patent/GB2055780B/en
Publication of JPS5626729A publication Critical patent/JPS5626729A/ja
Pending 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
    • G11B5/70657—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 with a skin
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]

Landscapes

  • Hard Magnetic Materials (AREA)
  • Magnetic Record Carriers (AREA)
  • Compounds Of Iron (AREA)
JP10264079A 1979-08-11 1979-08-11 Powdered magnetic material for magnetic recording medium Pending JPS5626729A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP10264079A JPS5626729A (en) 1979-08-11 1979-08-11 Powdered magnetic material for magnetic recording medium
NL8004301A NL8004301A (nl) 1979-08-11 1980-07-27 Magnetisch poeder voor een magnetisch registreermedium.
US06/173,618 US4321303A (en) 1979-08-11 1980-07-30 Magnetic powder for magnetic recording medium
DE19803029835 DE3029835A1 (de) 1979-08-11 1980-08-06 Magnetpulver fuer ein magnetisches aufzeichnungsmedium
GB8026104A GB2055780B (en) 1979-08-11 1980-08-11 Magnetic powder for magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10264079A JPS5626729A (en) 1979-08-11 1979-08-11 Powdered magnetic material for magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS5626729A true JPS5626729A (en) 1981-03-14

Family

ID=14332830

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10264079A Pending JPS5626729A (en) 1979-08-11 1979-08-11 Powdered magnetic material for magnetic recording medium

Country Status (5)

Country Link
US (1) US4321303A (en, 2012)
JP (1) JPS5626729A (en, 2012)
DE (1) DE3029835A1 (en, 2012)
GB (1) GB2055780B (en, 2012)
NL (1) NL8004301A (en, 2012)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60170906A (ja) * 1984-02-16 1985-09-04 Kanto Denka Kogyo Kk Ｃｏ分を含む紡錘状γ−Ｆｅ↓２Ｏ↓３磁性粉及びその製造方法
JPH02167897A (ja) * 1988-10-13 1990-06-28 Shikoku Chem Corp ホウ酸アルミニウムウィスカー及びその製法
JP2005310856A (ja) * 2004-04-19 2005-11-04 Dowa Mining Co Ltd 磁気記録媒体用磁性粉末

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4437881A (en) * 1982-07-31 1984-03-20 Toda Kogyo Corp. Acicular ferromagnetic alloy particles and process for producing said particles
US4587157A (en) * 1982-10-25 1986-05-06 Verbatim Corp. Wear resisting undercoat for thin film magnetic recording media
US4514216A (en) * 1983-04-30 1985-04-30 Toda Kogyo Corp. Acicular ferromagnetic alloy particles for magnetic recording and process for producing the same
US4970124A (en) * 1988-05-11 1990-11-13 Eastman Kodak Company New magnetic metallic particles using rare-earth elements
US5217804A (en) * 1990-11-06 1993-06-08 Eastman Kodak Company Magnetic particles
US5965194A (en) * 1992-01-10 1999-10-12 Imation Corp. Magnetic recording media prepared from magnetic particles having an extremely thin, continuous, amorphous, aluminum hydrous oxide coating
WO1995002242A1 (en) * 1993-07-06 1995-01-19 Minnesota Mining And Manufacturing Company Doped magnetic iron oxide particles and method of preparing the same
JP5906214B2 (ja) * 2013-04-23 2016-04-20 富士フイルム株式会社 磁気記録用磁性粒子の製造方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4969588A (en, 2012) * 1972-09-01 1974-07-05

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3725126A (en) * 1968-02-19 1973-04-03 Minnesota Mining & Mfg Magnetic recording tape
BE794292A (fr) * 1972-01-21 1973-07-19 Bayer Ag Procede de preparation d'oxydes de fer magnetiques aciculaires finement divises
US4064292A (en) * 1972-09-01 1977-12-20 Badische Anilin- & Soda-Fabrik, Aktiengesellschaft Manufacture of cobalt-modified γ-iron(III)oxides
JPS5719049B2 (en, 2012) * 1974-06-13 1982-04-20
DE2520643C2 (de) * 1975-05-09 1983-11-17 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von γ-Eisen(III)oxid
US4137342A (en) * 1976-10-29 1979-01-30 Minnesota Mining And Manufacturing Company Cobalt-doped acicular hyper-magnetite particles

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4969588A (en, 2012) * 1972-09-01 1974-07-05

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60170906A (ja) * 1984-02-16 1985-09-04 Kanto Denka Kogyo Kk Ｃｏ分を含む紡錘状γ−Ｆｅ↓２Ｏ↓３磁性粉及びその製造方法
JPH02167897A (ja) * 1988-10-13 1990-06-28 Shikoku Chem Corp ホウ酸アルミニウムウィスカー及びその製法
JP2005310856A (ja) * 2004-04-19 2005-11-04 Dowa Mining Co Ltd 磁気記録媒体用磁性粉末

Also Published As

Publication number Publication date
DE3029835C2 (en, 2012) 1992-09-17
GB2055780A (en) 1981-03-11
NL8004301A (nl) 1981-02-13
GB2055780B (en) 1982-12-22
DE3029835A1 (de) 1981-03-26
US4321303A (en) 1982-03-23

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