Energy shift and damping of dipole-exchange spin waves in ultrathin ferromagnetic films

被引：0
|
作者：
Cottam, MG [1 ]
Costa, RN
机构：
[1] Univ Western Ontario, Dept Phys & Astron, London, ON N6A 3K7, Canada
[2] Univ Fed Ceara, Dept Fis, BR-60455760 Fortaleza, Ceara, Brazil
来源：
NANOSTRUCTURED MATERIALS | 1999年 / 12卷 / 1-4期
基金：
加拿大自然科学与工程研究理事会;
关键词：
D O I：
10.1016/S0965-9773(99)00143-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A finite-temperature perturbation formalism is developed to study the processes of spin-wave interactions in ultrathin ferromagnetic films including the effects of both the long-range magnetic dipole-dipole interactions and the short-range exchange interactions By contrast with previous macroscopic methods for evaluating spin-wave interactions, the dipolar terms are treated here within a Hamiltonian method together with exchange and anisotropy terms to obtain a theory applicable to ultrathin films at temperatures below the Curie temperature. The contributions to the energy shift and the damping (or reciprocal lifetime) of the dipole-exchange spin waves due to three-magnon and four magnon processes are calculated. Numerical examples are presented (C) 1999 Acta Metallurgica Inc.
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页码：395 / 398
页数：4
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