JPS57198604A - Ferromagnetic powder for magnetic recording medium and manufacture thereof - Google Patents

Ferromagnetic powder for magnetic recording medium and manufacture thereof

Info

Publication number
JPS57198604A
JPS57198604A JP56081878A JP8187881A JPS57198604A JP S57198604 A JPS57198604 A JP S57198604A JP 56081878 A JP56081878 A JP 56081878A JP 8187881 A JP8187881 A JP 8187881A JP S57198604 A JPS57198604 A JP S57198604A
Authority
JP
Japan
Prior art keywords
magnetic
ferrite
ferromagnetic powder
magnetic recording
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.)
Pending
Application number
JP56081878A
Other languages
Japanese (ja)
Inventor
Toshihiko Oguchi
Hirohisa Kato
Yoshiyasu Koike
Moriyasu Wada
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 JP56081878A priority Critical patent/JPS57198604A/en
Publication of JPS57198604A publication Critical patent/JPS57198604A/en
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
    • G11B5/712—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

Landscapes

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

Abstract

PURPOSE:To obtain a magnetic powder for a magnetic recording medium having extremely high recording density, by coating the surface of ferromagnetic powder with ultrafine hexagonal Ba ferrite particle. CONSTITUTION:Ba ferrite represented by the general formula: BaO.n(Fel-mM)2O3 is attached on the surface of ferromagnetic powder having mean particle diameter of 20-1,000nm and saturation magnetization of 70lmu/g or higher, where M represents at least one of Co, Ti, Zn, Mn, Ni, In, Cu, Ge and Nb, m=0-0.2 (when M refers to two or more metals, the sum of the respective component ratio=m1+m2+m3+...=m), and n=5.4-6.0. Since the Ba ferrite thus attached on the magnetic powder obtained in this manner has a single magnetic domain structure, its magnetic recording characteristics in a high frequency region is excellent, and since the magnetic characteristics of the Be ferrite itself is utilized in a low frequency region, the magnetic powder having excellent characteristics can be obtained.
JP56081878A 1981-05-30 1981-05-30 Ferromagnetic powder for magnetic recording medium and manufacture thereof Pending JPS57198604A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56081878A JPS57198604A (en) 1981-05-30 1981-05-30 Ferromagnetic powder for magnetic recording medium and manufacture thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56081878A JPS57198604A (en) 1981-05-30 1981-05-30 Ferromagnetic powder for magnetic recording medium and manufacture thereof

Publications (1)

Publication Number Publication Date
JPS57198604A true JPS57198604A (en) 1982-12-06

Family

ID=13758704

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56081878A Pending JPS57198604A (en) 1981-05-30 1981-05-30 Ferromagnetic powder for magnetic recording medium and manufacture thereof

Country Status (1)

Country Link
JP (1) JPS57198604A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4529524A (en) * 1983-12-26 1985-07-16 Toda Kogyo Corp. Process for producing plate-like barium ferrite particles for magnetic recording
US4698182A (en) * 1983-10-12 1987-10-06 Toda Kogyo Corp. Hexagonal plate-like barium ferrite particles for magnetic recording and process for producing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4698182A (en) * 1983-10-12 1987-10-06 Toda Kogyo Corp. Hexagonal plate-like barium ferrite particles for magnetic recording and process for producing the same
US4529524A (en) * 1983-12-26 1985-07-16 Toda Kogyo Corp. Process for producing plate-like barium ferrite particles for magnetic recording

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