EFFECT OF NEXT-NEAREST-NEIGHBOR INTERACTIONS ON SPIN-WAVES IN MAGNETIC SUPERLATTICES

被引：1

作者：

ALMEIDA, NS ^{[1
]}

FULCO, P ^{[1
]}

ALBUQUERQUE, EL ^{[1
]}

TILLEY, DR ^{[1
]}

机构：

[1] UNIV ESSEX,DEPT PHYS,COLCHESTER CO4 3SQ,ESSEX,ENGLAND

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1992年 / 4卷 / 45期

关键词：

D O I：

10.1088/0953-8984/4/45/023

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Results are presented for 3D magnetic superlattices consisting of alternating films of cubic Heisenberg ferromagnets. Taking into account the next-nearest-neighbour (NNN) interactions, an explicit equation for the spin-wave dispersion relation is obtained by means of a transfer matrix method. Numerical results am presented for FOC ferromagnetic films with different values of the exchange constant ratio eta = J(NNN)/J(NN). If eta not-equal 0, for every frequency omega, there are two pairs of allowed values of wavenumbers k and in some frequency range both can be real if eta greater-than-or-equal-to 1. For the superlattice, a comparison with the dispersion relation obtained considering only NN interaction is made and the main physical features are discussed.

引用

页码：8909 / 8918

页数：10

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