论文标题
由表面声波驱动的自旋波的参数激发和不稳定性
Parametric Excitation and Instabilities of Spin Waves driven by Surface Acoustic Waves
论文作者
论文摘要
在金属磁性薄膜结构中证明了通过相干表面声波对自旋波的参数激发。使用以微焦点的Brillouin光散射光谱和互补的微磁模拟与分析模型结合的互补微型模拟来分析所涉及的木元模式，用于确定自旋波不稳定性的起源。根据实验条件的不同，我们观察到源自不同的声子马格农和磁磁体散射过程的自旋波不稳定性。我们的结果表明，通过表面声波有效地激发了高振幅，在金属铁磁体中强烈的非线性木元素，这为创建微型非线性磁通系统的逻辑和数据处理打开了新的方法，以利用piezoeleclectricity从高激发效率中获利。
The parametric excitation of spin waves by coherent surface acoustic waves is demonstrated experimentally in metallic magnetic thin film structures. The involved magnon modes are analyzed with micro-focused Brillouin light scattering spectroscopy and complementary micromagnetic simulations combined with analytical modelling are used to determine the origin of the spin-wave instabilities. Depending on the experimental conditions, we observe spin-wave instabilities originating from different phonon-magnon and magnon-magnon scattering processes. Our results demonstrate that an efficient excitation of high amplitude, strongly nonlinear magnons in metallic ferromagnets is possible by surface acoustic waves, which opens novel ways to create micro-scaled nonlinear magnonic systems for logic and data processing that can profit from the high excitation efficiency of phonons using piezoelectricity.
