Advances in fine magnetic particles for high density recording

Author

Sugita, N. ; Maekawa, M. ; Ohta, Y. ; Okinaka, K. ; Nagai, N.

Author_Institution

Toda Kogyo Corp., Hiroshima, Japan

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

2854

Lastpage

2858

Abstract

Fine platelet particles of barium ferrite were prepared by the hydrothermal precipitation technique. The magnetic properties such as magnetization, coercivity and temperature variation of the coercivity can be controlled by the selection of the substitution elements. Non-stoichiometric Co²⁺-Ti⁴⁺ substitution yields the formation of the fine particles, and further the replacement of Co ²⁺ by Ni²⁺ reduces the temperature variation degree of the coercivity. These fine particles are thought to be good candidates for high density recording. Furthermore, we briefly discuss the preparation procedure of fine α-Fe acicular particles

Keywords

barium compounds; coercive force; ferrites; ferromagnetic materials; iron; magnetic particles; magnetic recording; magnetisation; particle size; powder metallurgy; powder technology; Ba ferrite; BaFe₁₂O₁₉; Fe; coercivity; fine α-Fe acicular particles; fine magnetic particles; fine platelet particles; high density recording; hydrothermal precipitation technique; magnetization; nonstoichiometric substitution; particle size control; substitution elements; temperature variation; Barium; Coercive force; Ferrites; Iron; Magnetic particles; Magnetic properties; Magnetic recording; Magnetization; Perpendicular magnetic recording; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.490174

Filename

490174