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Observation of Gyromagnetic Spin Wave Resonance in NiFe Films
Yuki Kurimune1, Mamoru Matsuo2,3,4,5, Yukio Nozaki1,6
1Department of Physics, Keio University, Yokohama 223-8522, Japan.
Abstract:
This Letter demonstrates spin wave resonance (SWR) owing to the gyromagnetic effect by propagating a Rayleigh-type surface acoustic wave (R-SAW) through ferromagnetic thin films. The SWR amplitude in a NiFe film shows a higher-order frequency variation than in a magnetoelastic Ni film. This frequency dependence is well understood in terms of the presence of a gyromagnetic field attributable to the local lattice rotation in the R-SAW. From the frequency dependence of the SWR amplitude, the gyromagnetic SWR could be separated from another SWR caused by a magnetoelastic effect of the ferromagnet.
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