JPS5660002A - Manufacture of high density recording magnetic powder - Google Patents

Manufacture of high density recording magnetic powder

Info

Publication number
JPS5660002A
JPS5660002A JP13492479A JP13492479A JPS5660002A JP S5660002 A JPS5660002 A JP S5660002A JP 13492479 A JP13492479 A JP 13492479A JP 13492479 A JP13492479 A JP 13492479A JP S5660002 A JPS5660002 A JP S5660002A
Authority
JP
Japan
Prior art keywords
salt
high density
magnetic
alkali
magnetic powder
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
JP13492479A
Other languages
Japanese (ja)
Other versions
JPS6249963B2 (en
Inventor
Koki Yokoyama
Reiji Nishikawa
Osamu Kubo
Masanobu Ueha
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP13492479A priority Critical patent/JPS5660002A/en
Publication of JPS5660002A publication Critical patent/JPS5660002A/en
Publication of JPS6249963B2 publication Critical patent/JPS6249963B2/ja
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
    • G11B5/70678—Ferrites

Landscapes

  • Compounds Of Iron (AREA)
  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

PURPOSE:To obtain a magnetic power having uniform composition and is suitable for magnetic perpendicular recording in high density by a method wherein alkali is made to come in contact with an aqueous solution containing ferric salt, cobalt salt and one or more of barium salt, calcium salt abd strontium salt to make to coprecipitate. CONSTITUTION:A mixed liquid containing alkali and alkali carbonate is made to come in contact with an aqueous solution containing ferric salt, cobalt salt and one or more of barium salt, calcium salt and strontium salt to obtain a coprecipitated substance. The coprecipitated substance is washed, dried and is heat-treated (for example, at 950 deg.C) to obtain ferric corpuscles of hexagonal system substituted by Co having average particle diameter of about 0.01-0.3mu. By this way, a magnetic powder having uniform composition, systematic form and is suitable for magnetic perpendicular recording in high density can be obtained.
JP13492479A 1979-10-19 1979-10-19 Manufacture of high density recording magnetic powder Granted JPS5660002A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13492479A JPS5660002A (en) 1979-10-19 1979-10-19 Manufacture of high density recording magnetic powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13492479A JPS5660002A (en) 1979-10-19 1979-10-19 Manufacture of high density recording magnetic powder

Publications (2)

Publication Number Publication Date
JPS5660002A true JPS5660002A (en) 1981-05-23
JPS6249963B2 JPS6249963B2 (en) 1987-10-22

Family

ID=15139717

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13492479A Granted JPS5660002A (en) 1979-10-19 1979-10-19 Manufacture of high density recording magnetic powder

Country Status (1)

Country Link
JP (1) JPS5660002A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069349A2 (en) * 1981-07-02 1983-01-12 Kabushiki Kaisha Toshiba Magnetic recording media
JPS5841727A (en) * 1981-08-19 1983-03-11 バスフ・アクチエンゲゼルシヤフト Manufacture of fine ferrite powder
JPS5841728A (en) * 1981-08-19 1983-03-11 バスフ・アクチエンゲゼルシヤフト Manufacture of fine ferrite powder
JPS61140111A (en) * 1984-12-11 1986-06-27 サントル・ナシオナル・ド・ラ・ルシエルシユ・シアンテイフイーク Preparation of hexagonal magnetized hexagonal ferrite and use thereof as base material for magnet or magnetic recording
JPS61151834A (en) * 1984-12-26 1986-07-10 Toshiba Corp Magnetic recording medium
DE3729497A1 (en) * 1986-09-05 1988-03-10 Nippon Zeon Co MAGNETIC POWDER FOR MAGNETIC RECORDING
US5358660A (en) * 1988-01-14 1994-10-25 Showa Denko Kabushiki Kaisha Magnetic particles for perpendicular magnetic recording
JP2009084125A (en) * 2007-10-02 2009-04-23 Tdk Corp Method for manufacturing ferrite powder, ferrite powder, and magnetic recording medium
JP2010001171A (en) * 2008-06-18 2010-01-07 Hitachi Metals Ltd Ferrite particle for magnetic recording medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4838705A (en) * 1971-09-17 1973-06-07
JPS4923676A (en) * 1972-06-22 1974-03-02
JPS50116398A (en) * 1974-02-22 1975-09-11
JPS50134608A (en) * 1974-04-10 1975-10-24

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4838705A (en) * 1971-09-17 1973-06-07
JPS4923676A (en) * 1972-06-22 1974-03-02
JPS50116398A (en) * 1974-02-22 1975-09-11
JPS50134608A (en) * 1974-04-10 1975-10-24

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069349A2 (en) * 1981-07-02 1983-01-12 Kabushiki Kaisha Toshiba Magnetic recording media
JPS5841727A (en) * 1981-08-19 1983-03-11 バスフ・アクチエンゲゼルシヤフト Manufacture of fine ferrite powder
JPS5841728A (en) * 1981-08-19 1983-03-11 バスフ・アクチエンゲゼルシヤフト Manufacture of fine ferrite powder
JPH0359007B2 (en) * 1981-08-19 1991-09-09 Basf Ag
JPH0359008B2 (en) * 1981-08-19 1991-09-09 Basf Ag
JPS61140111A (en) * 1984-12-11 1986-06-27 サントル・ナシオナル・ド・ラ・ルシエルシユ・シアンテイフイーク Preparation of hexagonal magnetized hexagonal ferrite and use thereof as base material for magnet or magnetic recording
JPS61151834A (en) * 1984-12-26 1986-07-10 Toshiba Corp Magnetic recording medium
DE3729497A1 (en) * 1986-09-05 1988-03-10 Nippon Zeon Co MAGNETIC POWDER FOR MAGNETIC RECORDING
US5358660A (en) * 1988-01-14 1994-10-25 Showa Denko Kabushiki Kaisha Magnetic particles for perpendicular magnetic recording
JP2009084125A (en) * 2007-10-02 2009-04-23 Tdk Corp Method for manufacturing ferrite powder, ferrite powder, and magnetic recording medium
JP2010001171A (en) * 2008-06-18 2010-01-07 Hitachi Metals Ltd Ferrite particle for magnetic recording medium

Also Published As

Publication number Publication date
JPS6249963B2 (en) 1987-10-22

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