Coercivity of Bi-substituted garnet films for magneto-optic memory

Author

Kleparski, G. ; Matveyev, S.N. ; Antonov, A.V. ; Starostin, Yu V. ; Chubarkenko, V.A.

Author_Institution

Inst. of Control Sci., Acad. of Sci., Moscow, USSR

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

2792

Lastpage

2794

Abstract

The effect of grain size on coercivity in Bi-substituted polycrystalline garnet films is investigated. The coercive force is found to decrease with decreasing grain size in samples having single-domain-size grains. The decrease is especially dramatic for chemically deposited films. This effect is fairly well explained by thermal fluctuations of magnetization inside the grain. The results obtained make it possible to determine the optimal characteristics of such films for use in magnetooptic memory

Keywords

Faraday effect; bismuth compounds; coercive force; dysprosium compounds; gadolinium compounds; garnets; grain size; magnetic domain walls; magnetic thin films; magnetisation reversal; magneto-optical devices; magneto-optical recording; sputtered coatings; Bi-substituted garnet films; BiDyGGIGSc₅O₁₂; BiDyGa5O12Fe5O12Sc5O12; BiGdAGIGSc₅O₁₂; BiGdAl5O12Fe5O12Sc5O12; GdGG substrate; GdGa5O12; chemical sedimentation; chemically deposited films; coercive force; domain wall movement; glass substrate; grain size effect; magnetisation reversal; magnetooptic memory; magnetooptical Faraday effect; magnetron sputtering; optimal characteristics; polycrystalline garnet films; scanning electron microscopy; thermal fluctuations; Chemicals; Coercive force; Garnet films; Glass; Grain size; Magnetic field measurement; Magnetooptic effects; Saturation magnetization; Substrates; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104876

Filename

104876