LONGITUDINAL SPIN FLUCTUATIONS IN ITINERANT-ELECTRON FERROMAGNETS

被引:8
作者
SOLONTSOV, AZ [1 ]
VASILEV, AN [1 ]
WAGNER, D [1 ]
机构
[1] RUHR UNIV BOCHUM,D-44780 BOCHUM,GERMANY
关键词
D O I
10.1088/0953-8984/7/9/011
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The relaxational dynamics of weak itinerant magnets below the Curie temperature is investigated. The calculation is based on the non-linear equations of motion for the magnetic order parameter. It is shown that besides the conventional linear relaxation mechanism due to the Landau damping of spin fluctuations (SFS) which gives rise to overdamped paramagnons, there may exist a different mechanism which is due to non-linear three-mode interactions of spin fluctuations. The interplay between these two mechanisms is analysed and it is argued that three-mode scattering with emission, or absorption, of a longitudinal SF by a magnon may dominate. This results in a new type of overdamped longitudinal SF propagating close to the magnon dispersion, which has probably been observed in recent neutron scattering experiments.
引用
收藏
页码:1855 / 1862
页数:8
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