SURFACE PHASE-TRANSITIONS AND SPIN-WAVE MODES IN SEMI-INFINITE MAGNETIC SUPERLATTICES WITH ANTIFERROMAGNETIC INTERFACIAL COUPLING

被引：82

作者：

LEPAGE, JG

CAMLEY, RE

机构：

[1] Department of Physics, University of Colorado, Colorado Springs

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 65卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.65.1152

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We analyze the bulk and surface spin-wave modes of a semi-infinite Fe/Gd superlattice. If an externally applied magnetic field is increased from zero, one surface mode is driven soft, indicating a surface phase transition which occurs at a field value about 5 times lower than that necessary to cause a bulk phase transition. The phase transition is shown to nucleate at the surface and has a large penetration depth (on the order of a few hundred angstroms) even for fields just slightly above the value needed to induce the transition. © 1990 The American Physical Society.

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页码：1152 / 1155

页数：4

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