The theory of ultrasoft magnetic films
作者:
J. P. Bouchaud,
P. G. Ze´rah,
期刊:
Journal of Applied Physics
(AIP Available online 1990)
卷期:
Volume 68,
issue 7
页码: 3783-3785
ISSN:0021-8979
年代: 1990
DOI:10.1063/1.346305
出版商: AIP
数据来源: AIP
摘要:
We propose a theoretical interpretation of the unusual magnetic properties of ultrasoft magnetic films. Effective‐medium theory is shown to reproduce remarkably well the dependence of the low‐frequency susceptibility with magnetic field. In order to understand the dynamical susceptibility, one needs to generalize the usual Landau–Lifshitz equation and introduce an anisotropic dissipative term. The two relaxation coefficients &agr;1,&agr;2are determined by a fit of the experimental data. &agr;2is found to be large, perhaps reflecting the strong inhomogeneity of the local anisotropy field.
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