Coercivity for Ba-ferrite superfine particles

Author

Ido, T. ; Kubo, O. ; Yokoyama, H.

Author_Institution

Toshiba R&D Center, Kawasaki, Japan

Volume

22

Issue

5

fYear

1986

fDate

9/1/1986 12:00:00 AM

Firstpage

704

Lastpage

706

Abstract

Intrinsic coercivity for Co and Ti substituted Ba-ferrite superfine particles free from agglomeration, and the particle agglomeration effect, were investigated by measuring coercivity for Ba-ferrite particles dispersed and attached onto SiO2particles. The coercivity for small aspect ratio (diameter to thickness ratio) Ba-ferrite platelet particles increases with decreasing the Ba-ferrite concentration in the samples and attains a constant value, which can be regarded as the intrinsic particle coercivity. Small aspect ratio Ba-ferrite platelet particles showed coercivity decrease with particle agglomeration, while large aspect ratio particles showed coercivity increase. The particles with intermediate aspect ratio showed no coercivity change due to particle agglomeration. The coercivity increase with increasing agglomeration, which seems to be characteristic behavior for Ba-ferrite platelet particles, is caused by a formation of particle stacking agglomeration, which behaves like particles with small aspect ratio.

Keywords

Coercive forces; Ferrite materials/devices; Perpendicular magnetic recording; Anisotropic magnetoresistance; Coercive force; Crystallization; Dispersion; Glass; Magnetic anisotropy; Magnetic separation; Particle measurements; Perpendicular magnetic anisotropy; Perpendicular magnetic recording;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1986.1064371

Filename

1064371