Coercivity of (YSmCa)3(FeGe)5O12LPE films

Author

Keszei, B. ; Pardavi-Horváth, M.

Author_Institution

Central Research Institute of Physics, Budapest, Hungary

Volume

14

Issue

5

fYear

1978

fDate

9/1/1978 12:00:00 AM

Firstpage

605

Lastpage

607

Abstract

Optimum conditions for growing low coercivity Y1.9Sm0.1CaxGexFe5-xO12LPE films for 5μ bubble device application were determined from measurements of the influence of the underccoling / $0 < \\Delta T \\leq 30\\deg$ C/, rotation rate / $0 \\leq r \\leq 300$ rpm/ and melt composition /0.6 $\\leq \\leq$ Ca/Ge ≤ 1.4/ on coercivity. The coercive force /Hc/ was measured by the oscillating stripe domain technique. The coercivity increases with supercooling and increasing GeO2content of the melt. Increased rotation rate reduces the coercivity to a nearly constant value above 100 rpm. From the wall displacement vs. drive field curves two distinct coercive forces can be defined. One of them, Hclis nearly independent of film thickness being the intrinsic "bulk" coercivity of the LPE layer. The higher one, Hc2, increases hyperbolically with decreasing thickness and it is related to the transient layer formed at the beginning of the film growth.

Keywords

Coercive forces; Magnetic bubble films; Coercive force; Drives; Extraterrestrial measurements; Force measurement; Garnet films; Magnetic domain walls; Magnetic domains; Magnetic field measurement; Magnetic films; Rotation measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1978.1059817

Filename

1059817