能量守恒和线动量条件下声表面波激发磁弹性自旋波
Fully Resonant Magneto-elastic Spin-wave Excitation by Surface Acoustic Waves under Conservation of Energy and Linear Momentum
摘要：
研究了声表面波在微结构磁性薄膜中的共振激发。利用微聚焦布里渊光散射光谱研究了自旋波和声波。在低磁场下，除了不满足动量守恒的铁磁共振激发外，还可以观察到有限波长自旋波的激发。使用微磁模拟，我们验证，在此激发能量和线性动量守恒，并完全从SAW转移到自旋波。
英文摘要：
We report on the resonant excitation of spin waves in micro-structured magnetic thin films by surface acoustic waves (SAWs). The spin waves as well as the acoustic waves are studied by micro-focused Brillouin light scattering spectroscopy. Besides the excitation of the ferromagnetic resonance, a process which does not fulfill momentum conservation, also the excitation of finite-wavelength spin waves can be observed at low magnetic fields. Using micromagnetic simulations, we verify that during this excitation both energy and linear momentum are conserved and fully transferred from the SAW to the spin wave.
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