Traveling surface spin-wave resonance spectroscopy using surface acoustic waves

被引：76
作者：
Gowtham, P. G. [1 ]
Moriyama, T. [2 ]
Ralph, D. C. [1 ,3 ]
Buhrman, R. A. [1 ]
机构：
[1] Cornell Univ, Ithaca, NY 14853 USA
[2] Kyoto Univ, Inst Chem Res, Kyoto 606, Japan
[3] Kavli Inst Cornell, Ithaca, NY 14853 USA
来源：
JOURNAL OF APPLIED PHYSICS | 2015年 / 118卷 / 23期
基金：
美国国家科学基金会;
关键词：
DYNAMICS;
D O I：
10.1063/1.4938390
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Coherent gigahertz-frequency surface acoustic waves (SAWs) traveling on the surface of a piezoelectric crystal can, via the magnetoelastic interaction, resonantly excite traveling surface spin waves in an adjacent thin-film ferromagnet. These excited surface spin waves, traveling with a definite in-plane wave-vector q(parallel to) enforced by the SAW, can be detected by measuring changes in the electro-acoustical transmission of a SAW delay line. Here, we provide a demonstration that such measurements constitute a precise and quantitative technique for spin-wave spectroscopy, providing a means to determine both isotropic and anisotropic contributions to the spin-wave dispersion and damping. We demonstrate the effectiveness of this spectroscopic technique by measuring the spin-wave properties of a Ni thin film for a large range of wave vectors, vertical bar q(parallel to)vertical bar = 2.5 x 10(4)-8 x 10(4) cm(-1), over which anisotropic dipolar interactions vary from being negligible to quite significant. (C) 2015 AIP Publishing LLC.
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页数：9
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