Spin-Wave Spectral Analysis in Crescent-Shaped Ferromagnetic Nanorods
Spin-Wave Spectral Analysis in Crescent-Shaped Ferromagnetic Nanorods
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DOI：
10.1103/physrevapplied.19.064045
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发表时间：
2023-06
影响因子：
4.6
通讯作者：
Mateusz Gołȩbiewski;Hanna Reshetniak;Uladzislau Makartsou;M. Krawczyk;Arjen van den Berg;S. Ladak;A. Barman
中科院分区：
文献类型：
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作者：
Mateusz Gołȩbiewski;Hanna Reshetniak;Uladzislau Makartsou;M. Krawczyk;Arjen van den Berg;S. Ladak;A. Barman
研究三维纳米系统中自旋波的性质是磁振子学领域的一项创新。掌握和理解三维磁性系统表面、边缘和体积部分的表面、边缘和体积部分的磁化动力学和束缚的性质，有助于发现新的现象，并为它们在磁子和自旋电子器件中的应用提供新的可能性。在这项工作中，我们用数值方法研究了几何形状和外加磁场对新月形(CS)光波导中的局域化和动力学特性的影响。结果表明，改变波导中的磁场方向破坏了对称性，影响了本征模相对于静态退磁场的局域化。这反过来又会对它们的频率产生直接影响。此外，还发现CS结构在某些磁场取向上具有显著的饱和特征，导致了柱状磁化强度分布。因此，我们提出了基于手征性的高频SWS的非互易色散关系，它可以受场方向(形状对称性)及其幅度(饱和度)的控制。
The research on the properties of spin waves (SWs) in three-dimensional nanosystems is an innovative idea in the field of magnonics. Mastering and understanding the nature of magnetization dynamics and binding of SWs at surfaces, edges, and in-volume parts of three-dimensional magnetic systems enables the discovery of new phenomena and suggests new possibilities for their use in magnonic and spintronic devices. In this work, we use numerical methods to study the effect of geometry and external magnetic field manipulations on the localization and dynamics of SWs in crescent-shaped (CS) waveguides. It is shown that changing the magnetic field direction in these waveguides breaks the symmetry and affects the localization of eigenmodes with respect to the static demagnetizing field. This in turn has a direct effect on their frequency. Furthermore, CS structures were found to be characterized by significant saturation at certain field orientations, resulting in a cylindrical magnetization distribution. Thus, we present chirality-based nonreciprocal dispersion relations for high-frequency SWs, which can be controlled by the field direction (shape symmetry) and its amplitude (saturation).