Submicron bubble garnets and their characterizations

Author

Ohta, Norio ; Ikeda, Tadashi ; Ishida, Fumihiko ; Sugita, Yutaka

Author_Institution

Central Research Laboratory, Hitachi Ltd., Kokubunji, Tokyo, Japan

Volume

16

Issue

5

fYear

1980

fDate

9/1/1980 12:00:00 AM

Firstpage

610

Lastpage

615

Abstract

New Submicron ( $0.5-1.0 \\mu$ m diam) bubble garnets have been developed. In order to reduce saturation induction $4\\pi Ms$ as low as possible, suitable choice of amounts of nonmagnetic ions substituting for ferric ions in both tetrahedral and octahedral sites were studied in (YSm)3(FeAl)5O12, (YSmLu)3- (FeGaSc)5O12, (YSmLu)3(FeAlSc)5O12and (LaLuSm)3- (FeGa)5O12garnet systems. For example, in (YSmLu)3- (FeAlSc)5O12a film with the following properties was grown; strip width $w = 0.7\\mu$ m, film thickness $h= 0.7\\mu$ m, quality factor $q=2.8$ , Curie temperature $Tc= 140\\deg$ C and $4\\pi Ms=770$ G. The temperature properties of those films could be improved drastically by doping with a small amount of Gd ion. Wall mobilities μw of those films are in the region from 200 to 500cm/s/Oe. Preceding these material studies, several film characterization methods have been investigated. Film thickness was measured by Fluorescent X-ray method, strip width by using a highly sensitivity TV camera, and bubble collapse field by FMR resonance technique respectively.

Keywords

Magnetic bubble films; Cameras; Doping; Fluorescence; Garnets; Magnetic resonance; Q factor; Strips; TV; Temperature; Thickness measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1980.1060788

Filename

1060788