HEXAGONAL FERRITE MAGNETIC BODY FOR MAGNETIC RECORDING AND ITS MANUFACTURE

PURPOSE:To obtain the titled hexagonal ferrite magnetic body exhibiting high coercive force and high saturation magnetization by heating a compd. or a composition having a trivalent iron atom in a reducing atmosphere. CONSTITUTION:A compd. or a composition having a trivalent iron atom is heated in a...

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Bibliographic Details
Main Authors KAMIYAMA KOJI, HASEGAWA KAZUHIRO
Format Patent
LanguageEnglish
Published 24.06.1986
Subjects
BASIC ELECTRIC ELEMENTS
CHEMISTRY
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
ELECTRICITY
INDUCTANCES
INORGANIC CHEMISTRY
MAGNETS
METALLURGY
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
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Summary:PURPOSE:To obtain the titled hexagonal ferrite magnetic body exhibiting high coercive force and high saturation magnetization by heating a compd. or a composition having a trivalent iron atom in a reducing atmosphere. CONSTITUTION:A compd. or a composition having a trivalent iron atom is heated in a reducing atmosphere, and 0.1-30atom% of the trivalent iron atom is converted into a bivalent iron atom. A hexagonal ferrite magnetic body contg. a coercive force controlling component and whose 0.1-30atom% trivalent iron atom is substituted for a bivalent iron atom is obtained by this method. A magnetic body having a basic composition formula shown by formulas I and II can be exemplified as the magnetic body. In the formulas, R is Ba, Ca, Sr, and Pb, M is Co, Ni, and Zn, M' is Ti, Zr, and Hf, M' is Al, Ga, and In, the (x) in formula I is 0<x<=1.2, and the (x) in formula II is 0<x<=2.4.
Bibliography:Application Number: JP19840258746