Studies of the modulational instability of antiferromagnetic spin waves in 1D

[摘要] For antiferromagnetism spin chains the modulational instability of extended nonlinear spin waves has been investigated both analytically within the framework of linear stability analysis and also numerically by means of molecular dynamics simulations. For the particular case of on-site easy-axis anisotropy treated here linear stability analysis predicts the instability region and the growth rates of modulation satellites. Our numerical simulations demonstrate that the analytical predictions correctly describe the onset of instability. For long time scales when the instability is fully developed the linear stability analysis fails and the time evolution of the modulated spin waves can show both regular and chaotic behavior. Copyright (C) 1998 Elsevier Science B.V.

[发布日期] 1998-11-15

[效力级别]  Proceedings Paper

[关键词] modulational instability;antiferromagnetism;molecular dynamics simulations;nonlinear spin waves;easy axis anisotropy