MAGNETOSTATIC MODE SPECTRUM OF RECTANGULAR FERROMAGNETIC PARTICLES

被引:45
作者
BRYANT, PH
SMYTH, JF
SCHULTZ, S
FREDKIN, DR
机构
[1] LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720
[2] UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093
来源
PHYSICAL REVIEW B | 1993年 / 47卷 / 17期
关键词
D O I
10.1103/PhysRevB.47.11255
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Approximate methods for obtaining the magnetostatic mode spectrum of thin rectangular samples have been known for some time. However, our experimental results from lithographic arrays of submicron Permalloy particles show that these methods perform relatively poorly if the (in-plane) applied field is not large compared to 4piM(s). We present an improved method for finding the spectrum that takes into account both the elliptical character of the mode precession and sample edge effects. We show that the case of an infinite magnetic strip can be reduced to a one-dimensional eigenvalue problem which we solve numerically, yielding insight into the more difficult rectangular case. Effects of the nonuniform demagnetization field on the spatial patterns and frequencies of the modes are also studied.
引用
收藏
页码:11255 / 11262
页数:8
相关论文
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