JPS5661101A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS5661101A
JPS5661101A JP13635579A JP13635579A JPS5661101A JP S5661101 A JPS5661101 A JP S5661101A JP 13635579 A JP13635579 A JP 13635579A JP 13635579 A JP13635579 A JP 13635579A JP S5661101 A JPS5661101 A JP S5661101A
Authority
JP
Japan
Prior art keywords
hexagonal crystal
substituted
magnetic recording
magnetic
ferrite
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
JP13635579A
Other languages
Japanese (ja)
Other versions
JPS6115563B2 (en
Inventor
Koki Yokoyama
Reiji Nishikawa
Osamu Kubo
Tadashi Ido
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 JP13635579A priority Critical patent/JPS5661101A/en
Publication of JPS5661101A publication Critical patent/JPS5661101A/en
Publication of JPS6115563B2 publication Critical patent/JPS6115563B2/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

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

Abstract

PURPOSE:To obtain the flexible recording medium which is suitable for high density recording by substituting Co by a part of Fe in hexagonal crystal ferrite which contains a specified element A and is expressed by AFe12O10, and employing fine magnetic particles whose C axis is vertical to the plane. CONSTITUTION:As the magnetic powder forming a magnetic recording layer, is employed the particles of Co substituted hexagonal crystal ferrite or Co substituted hexagonal crystal ferrite which is substituted by other ions for compensating the number of valancy. For example, a specified element A is Ba, Sr, Ca, or Pb; and M is V, Nb, Sb, or Ta; and X=0.5-1.1: Then, we obtain AFe12-xCoxO10-xFex, AFe12-3/2xCoxM1/2xO10, and the like. If x<0.5, the vertical magnetization is not sufficient. If x>1.1, the magnetic recording is difficult. If the diameter of the fine particles of ferrite is less than 0.01mu, ferromagnetism is not expressed; and if it is more than 0.3mu, the high-density vertical magnetization cannot be implemented. The 10-40pts.wt. of phenol resin and the like, 0.5-20pts.wt. fatty acid, and 200pts.wt. of solvent are added to 100pts.wt. of the fine particles. Then, they are blended, rolled, dried; and the work is finished.
JP13635579A 1979-10-24 1979-10-24 Magnetic recording medium Granted JPS5661101A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13635579A JPS5661101A (en) 1979-10-24 1979-10-24 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13635579A JPS5661101A (en) 1979-10-24 1979-10-24 Magnetic recording medium

Related Child Applications (2)

Application Number Title Priority Date Filing Date
JP59150781A Division JPS6063715A (en) 1984-07-20 1984-07-20 Magnetic recording medium
JP59150780A Division JPS6063714A (en) 1984-07-20 1984-07-20 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS5661101A true JPS5661101A (en) 1981-05-26
JPS6115563B2 JPS6115563B2 (en) 1986-04-24

Family

ID=15173239

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13635579A Granted JPS5661101A (en) 1979-10-24 1979-10-24 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS5661101A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS582225A (en) * 1981-06-25 1983-01-07 Toshiba Corp Hexagonal system ferrite powder for magnetic recording
EP0069349A2 (en) * 1981-07-02 1983-01-12 Kabushiki Kaisha Toshiba Magnetic recording media
JPS58119610A (en) * 1982-01-08 1983-07-16 Toshiba Corp Magnetic recording medium
JPS5996532A (en) * 1982-11-25 1984-06-04 Fuji Photo Film Co Ltd Magnetic recording body
JPS6063714A (en) * 1984-07-20 1985-04-12 Toshiba Corp Magnetic recording medium
JPS6063715A (en) * 1984-07-20 1985-04-12 Toshiba Corp Magnetic recording medium
JPS60191022A (en) * 1984-03-13 1985-09-28 Hitachi Ltd Hexagonal ferrite powder and its manufacture
JPS60209928A (en) * 1984-03-31 1985-10-22 Toshiba Corp Magnetic recording medium
JPS621114A (en) * 1985-06-26 1987-01-07 Fuji Photo Film Co Ltd Magnetic recording medium
JPS6218620A (en) * 1985-07-17 1987-01-27 Matsushita Electric Ind Co Ltd Coating type vertical magnetic recording medium
JPS62134824A (en) * 1985-12-07 1987-06-17 Konishiroku Photo Ind Co Ltd Magnetic recording medium

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4838705A (en) * 1971-09-17 1973-06-07
JPS50134608A (en) * 1974-04-10 1975-10-24
JPS5320596A (en) * 1976-08-10 1978-02-24 Mitsubishi Metal Corp Method of manufacturing highhmagnetic resistant magneticcrecording powder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4838705A (en) * 1971-09-17 1973-06-07
JPS50134608A (en) * 1974-04-10 1975-10-24
JPS5320596A (en) * 1976-08-10 1978-02-24 Mitsubishi Metal Corp Method of manufacturing highhmagnetic resistant magneticcrecording powder

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0244775B2 (en) * 1981-06-25 1990-10-05 Tokyo Shibaura Electric Co
JPS582225A (en) * 1981-06-25 1983-01-07 Toshiba Corp Hexagonal system ferrite powder for magnetic recording
EP0069349A2 (en) * 1981-07-02 1983-01-12 Kabushiki Kaisha Toshiba Magnetic recording media
JPS58119610A (en) * 1982-01-08 1983-07-16 Toshiba Corp Magnetic recording medium
JPS5996532A (en) * 1982-11-25 1984-06-04 Fuji Photo Film Co Ltd Magnetic recording body
JPH0479045B2 (en) * 1982-11-25 1992-12-14 Fuji Photo Film Co Ltd
JPS60191022A (en) * 1984-03-13 1985-09-28 Hitachi Ltd Hexagonal ferrite powder and its manufacture
JPS60209928A (en) * 1984-03-31 1985-10-22 Toshiba Corp Magnetic recording medium
JPH033922B2 (en) * 1984-07-20 1991-01-21 Tokyo Shibaura Electric Co
JPS6063715A (en) * 1984-07-20 1985-04-12 Toshiba Corp Magnetic recording medium
JPH033921B2 (en) * 1984-07-20 1991-01-21 Tokyo Shibaura Electric Co
JPS6063714A (en) * 1984-07-20 1985-04-12 Toshiba Corp Magnetic recording medium
JPS621114A (en) * 1985-06-26 1987-01-07 Fuji Photo Film Co Ltd Magnetic recording medium
JPH0760512B2 (en) * 1985-06-26 1995-06-28 富士写真フイルム株式会社 Magnetic recording medium
JPS6218620A (en) * 1985-07-17 1987-01-27 Matsushita Electric Ind Co Ltd Coating type vertical magnetic recording medium
JPH0514330B2 (en) * 1985-07-17 1993-02-24 Matsushita Electric Ind Co Ltd
JPS62134824A (en) * 1985-12-07 1987-06-17 Konishiroku Photo Ind Co Ltd Magnetic recording medium

Also Published As

Publication number Publication date
JPS6115563B2 (en) 1986-04-24

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