Specificities of Spin Wave Focusing in EuO and EuS Crystals

被引：3

作者：

Bakharev, S. M. ^{[1
,2
]}

Savchenko, S. P. ^{[1
]}

Tankeyev, A. P. ^{[1
]}

机构：

[1] Russian Acad Sci, Mikheev Inst Met Phys, Ural Branch, Ekaterinburg 620108, Russia

[2] Ural Fed Univ, Ekaterinburg 620002, Russia

来源：

PHYSICS OF THE SOLID STATE | 2019年 / 61卷 / 02期

关键词：

PHONON MAGNIFICATION; ENHANCEMENT; SURFACE; SHAPE; HEAT;

D O I：

10.1134/S1063783419020045

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Specificities of spin wave focusing in EuO and EuS crystals are studied. It is shown that spin wave focusing is absent in the long-wave approximation: it is observed only for wave vectors in the second half of the Brillouin zone (aq , where a is the lattice constant and q is the magnitude of the wave vector). It was found that, for EuO and EuS crystals, the directions of spin wave focusing differ due to the different signs of the exchange integrals responsible for the exchange interaction of the magnetic moment with the second neighbors. The directions along which a magnon caustic is formed are determined.

引用

页码：117 / 126

页数：10

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