JPS6489504A - Magnetic powder for high density magnetic recording and magnetic recording medium using same - Google Patents

Magnetic powder for high density magnetic recording and magnetic recording medium using same

Info

Publication number
JPS6489504A
JPS6489504A JP62247527A JP24752787A JPS6489504A JP S6489504 A JPS6489504 A JP S6489504A JP 62247527 A JP62247527 A JP 62247527A JP 24752787 A JP24752787 A JP 24752787A JP S6489504 A JPS6489504 A JP S6489504A
Authority
JP
Japan
Prior art keywords
hexagonal ferrite
coercive force
magnetic powder
displacement
magnetic
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
JP62247527A
Other languages
Japanese (ja)
Inventor
Osamu Kubo
Tsutomu Nomura
Tadashi Ido
Koki Yokoyama
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
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 filed Critical Toshiba Corp
Priority to JP62247527A priority Critical patent/JPS6489504A/en
Publication of JPS6489504A publication Critical patent/JPS6489504A/en
Pending legal-status Critical Current

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

Abstract

PURPOSE:To reduce temperature dependency of coercive force of magnetic grains by composing from displacement hexagonal ferrite which has specific size range and coercive force and whose Fe atom is displaced with In of specific number of atoms per one chemical formula. CONSTITUTION:Magnetic powder consists of displacement hexagonal ferrite which has an average particle diameter of 0.02-0.2mum and a coercive force of 200-2000Oe and whose Fe atom is displaced with In of number of atoms of 0.05-1.0 per one chemical formula. Co-Ti displacement hexagonal ferrite crystal expressed by the following usual equation is a typical example; AFe12-2x-yCoxTixInyO19 (A is an element chosed from Ba, Sr, Pb and Ca.), where 0.2<=x<=1.2 and 0.05<=y<=1.0. To manufacture the magnetic powder, oxide and carbonation of each element necessary for forming hexagonal ferrite are dissolved together with glass formation substance, the melt is quenched to form glass, crystal grains of hexagonal ferrite are precipitated by heat treatment at a specified temperature, then glass composition is eliminated by heat treatment. Temperature characteristics of coercive force of magnetic powder and the recording medium using them can be thereby improved.
JP62247527A 1987-09-30 1987-09-30 Magnetic powder for high density magnetic recording and magnetic recording medium using same Pending JPS6489504A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62247527A JPS6489504A (en) 1987-09-30 1987-09-30 Magnetic powder for high density magnetic recording and magnetic recording medium using same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62247527A JPS6489504A (en) 1987-09-30 1987-09-30 Magnetic powder for high density magnetic recording and magnetic recording medium using same

Publications (1)

Publication Number Publication Date
JPS6489504A true JPS6489504A (en) 1989-04-04

Family

ID=17164822

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62247527A Pending JPS6489504A (en) 1987-09-30 1987-09-30 Magnetic powder for high density magnetic recording and magnetic recording medium using same

Country Status (1)

Country Link
JP (1) JPS6489504A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021226297A1 (en) * 2020-05-07 2021-11-11 Rogers Corporation M-type hexaferrite having a planar anisotropy

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021226297A1 (en) * 2020-05-07 2021-11-11 Rogers Corporation M-type hexaferrite having a planar anisotropy
GB2609128A (en) * 2020-05-07 2023-01-25 Rogers Corp M-type hexaferrite having a planar anisotropy

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