Observation of the propagation and interference of spin waves in ferromagnetic thin films

被引：60
|
作者：
Perzlmaier, Korbinian [1 ]
Woltersdorf, Georg [1 ]
Back, Christian H. [1 ]
机构：
[1] Univ Regensburg, Inst Expt & Angewandte Phys, D-93040 Regensburg, Germany
来源：
PHYSICAL REVIEW B | 2008年 / 77卷 / 05期
关键词：
D O I：
10.1103/PhysRevB.77.054425
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have observed the propagation of spin waves and spin-wave packets in 20-nm-thick Permalloy films upon microwave excitation by means of time-resolved scanning Kerr microscopy. Spin waves can be detected up to 80 mu m away from the driving coplanar strip line. In doing so, we were able to directly determine the phase velocities, dispersion relations and group velocities for different geometries of an externally applied in-plane magnetic field. In addition, we report on the direct optical observation of spin-wave interference with lateral and time (phase) resolution.
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页数：5
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