GB1441183A - Magnetic recording particles - Google Patents

Magnetic recording particles

Info

Publication number
GB1441183A
GB1441183A GB983874A GB983874A GB1441183A GB 1441183 A GB1441183 A GB 1441183A GB 983874 A GB983874 A GB 983874A GB 983874 A GB983874 A GB 983874A GB 1441183 A GB1441183 A GB 1441183A
Authority
GB
United Kingdom
Prior art keywords
particles
iron oxide
cobalt
magnetic recording
march
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
GB983874A
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
Publication of GB1441183A publication Critical patent/GB1441183A/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
    • G11B5/706—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
    • G11B5/70678—Ferrites
    • G11B5/70684—Ferro-ferrioxydes
    • G11B5/70689—Magnetite
    • 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
    • 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
    • G11B5/70647—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 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
    • G11B5/70657—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

Landscapes

  • Health & Medical Sciences (AREA)
  • Dermatology (AREA)
  • General Health & Medical Sciences (AREA)
  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)
  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

1441183 Coated ferric oxide particles TDK ELECTRONIC CO 5 March 1974 [5 March 1973] 9838/74 Heading C1A [Also in Divisions B2 and C3] Magnetic recording particles comprise ferromagnetic, acicular iron oxide particles, e.g. gamma-Fe 2 O 3 or Fe 3 O 4 having an average length of 0À1 to 1 microns and a ratio of the length to the width of 5 : 1 to 20 : 1, having an adsorbed layer or a coating or cobalt hydroxide which may contain a small proportion of cobalt oxide. The amount of the cobalt hydroxide may be from 0À5 to 10 wt. per cent based on the iron oxide. A process for preparing such particles comprises mixing ferromagnetic acicular iron oxide particles with a cobalt salt in an aqueous alkaline solution, e.g. NaOH, KOH or NH 4 OH, heating the resulting slurry at a temperature below the boiling point thereof and separating the particles from the mixture.
GB983874A 1973-03-05 1974-03-05 Magnetic recording particles Expired GB1441183A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2515973A JPS5321118B2 (en) 1973-03-05 1973-03-05

Publications (1)

Publication Number Publication Date
GB1441183A true GB1441183A (en) 1976-06-30

Family

ID=12158232

Family Applications (1)

Application Number Title Priority Date Filing Date
GB983874A Expired GB1441183A (en) 1973-03-05 1974-03-05 Magnetic recording particles

Country Status (3)

Country Link
JP (1) JPS5321118B2 (en)
DE (1) DE2410517C3 (en)
GB (1) GB1441183A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2380225A1 (en) * 1977-02-12 1978-09-08 Basf Ag PROCESS FOR PREPARING MAGNETIC IRON OXIDE IN THE FORM OF NEEDLES, CONTAINING COBALT
US4287233A (en) 1979-02-13 1981-09-01 Basf Aktiengesellschaft Manufacture of acicular cobalt-containing magnetic iron oxide
US4296149A (en) 1979-02-13 1981-10-20 Basf Aktiengesellschaft Manufacture of acicular cobalt-containing magnetic iron oxide
US4631140A (en) * 1984-10-18 1986-12-23 Basf Aktiengesellschaft Ferrimagnetic particles and their preparation
US4923519A (en) * 1986-09-13 1990-05-08 Bayer Aktiengesellschaft Magnetic iron oxide pigments and a process for their preparation
CN112374877A (en) * 2020-10-09 2021-02-19 河南师范大学 CoFe with magnetoresistive switching behavior2O4-CrO2Method for preparing composite material

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5259894A (en) * 1975-11-13 1977-05-17 Tdk Corp Magnetic material
US4137342A (en) * 1976-10-29 1979-01-30 Minnesota Mining And Manufacturing Company Cobalt-doped acicular hyper-magnetite particles
JPS5939814B2 (en) * 1978-03-16 1984-09-26 ティーディーケイ株式会社 Method for manufacturing magnetic recording media
JPS5852806A (en) * 1981-09-24 1983-03-29 Hitachi Maxell Ltd Magnetic recording medium
JPS6018609B2 (en) * 1981-10-01 1985-05-11 工業技術院長 Ferromagnetic powder and its manufacturing method
JPH0426450Y2 (en) * 1987-05-27 1992-06-25
US4944985A (en) * 1988-04-11 1990-07-31 Leach & Garner Method for electroless plating of ultrafine or colloidal particles and products produced thereby
DE3910782C2 (en) * 1988-12-24 2003-08-28 Toda Kogyo Corp Process for the production of magnetic iron oxides and pigments thus obtained

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA902968A (en) * 1972-06-20 Sony Corporation Method of making acicular cobalt-modified maghemite powder
JPS4974400U (en) * 1972-10-12 1974-06-27
JPS5224238A (en) * 1972-12-11 1977-02-23 Toshiyuki Oota Dip coating of aluminum

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2380225A1 (en) * 1977-02-12 1978-09-08 Basf Ag PROCESS FOR PREPARING MAGNETIC IRON OXIDE IN THE FORM OF NEEDLES, CONTAINING COBALT
US4287233A (en) 1979-02-13 1981-09-01 Basf Aktiengesellschaft Manufacture of acicular cobalt-containing magnetic iron oxide
US4296149A (en) 1979-02-13 1981-10-20 Basf Aktiengesellschaft Manufacture of acicular cobalt-containing magnetic iron oxide
US4631140A (en) * 1984-10-18 1986-12-23 Basf Aktiengesellschaft Ferrimagnetic particles and their preparation
US4923519A (en) * 1986-09-13 1990-05-08 Bayer Aktiengesellschaft Magnetic iron oxide pigments and a process for their preparation
CN112374877A (en) * 2020-10-09 2021-02-19 河南师范大学 CoFe with magnetoresistive switching behavior2O4-CrO2Method for preparing composite material
CN112374877B (en) * 2020-10-09 2022-05-13 河南师范大学 CoFe with magnetoresistive switching behavior2O4-CrO2Method for preparing composite material

Also Published As

Publication number Publication date
DE2410517C3 (en) 1979-09-27
DE2410517B2 (en) 1979-02-01
JPS49113199A (en) 1974-10-29
JPS5321118B2 (en) 1978-06-30
DE2410517A1 (en) 1974-09-12

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19940304