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arXiv 2508.02486cond-mat.mes-hall
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薄铁磁薄膜中自旋波在边缘局域模上的三磁振子散射

Three-magnon scattering of spin wave on edge-localized mode in thin ferromagnetic film

Julia Kharlan, Roman Verba, Krzysztof Sobucki, Paweł Gruszecki, Maciej Krawczyk

AI总结:

本研究针对薄铁磁薄膜边缘的三磁振子散射现象,构建解析理论并结合微磁模拟,揭示了体自旋波与边缘局域自旋波相互作用的产生机制及振幅、强度的影响规律。

摘要:

三波散射是一种极具吸引力的现象,在各类技术中有着诸多应用。降低系统对称性会对三波散射产生显著影响,在此情形下,散射过程不再遵循简单的动量守恒定律。本研究考察了薄铁磁薄膜边缘处的三磁振子散射过程,具体为体自旋波在反射时与边缘局域传播自旋波发生相互作用的情形。该相互作用通过三磁振子汇合过程或受激分裂过程,产生具有混合频率的新型体自旋波。我们构建了解析理论,并通过全微磁模拟对其进行了验证;研究表明,受激分裂过程中产生的波的振幅是汇合过程中产生波的数倍,这主要是由于前者的群速度更低。此外,非弹性散射波的强度表现出对边缘自旋波入射角和频率的显著依赖,这一特性超出了现有定性模型的解释范围。我们发现,只有考虑到散射波是由涉及入射波和反射波的多个基本三磁振子过程共同产生的,才能解释观测到的行为。散射波产生机制的复杂性,导致其振幅对自旋波反射时的相位累积具有极强的敏感性。

英文摘要:

Three-wave scattering is a fascinating phenomenon with many applications in various technologies. Reducing the system symmetry greatly affects three-wave scattering, which, in this case, goes beyond the simple momentum conservation law. In this study, we examine three-magnon scattering at the edge of a thin ferromagnetic film, when a bulk spin wave interacts with an edge-localized propagating spin-wave upon the reflection. This creates new bulk spin waves at mixed frequencies by means of three-magnon confluence or stimulated splitting processes. Using our developed analytical theory, which has been confirmed by full micromagnetic simulations, we demonstrate that the amplitude of the wave generated in the stimulated splitting process is several times larger than that generated in the confluence process, primarily due to the lower group velocity. Furthermore, intensity of inelastically scattered waves exhibit a pronounced dependence on the incidence angle and frequency of the edge spin wave that goes beyond existing qualitative models. We show that the observed behaviors can only be explained by taking into account, that the scattered waves are created by several elementary three-magnon processes involving the incident and reflected waves. The complex nature of the scattered wave creation results in a strong sensitivity of its amplitude to the phase accumulation of spin waves upon reflection.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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