纳米铁磁波导中自旋钉扎和自旋波色散的温度依赖性
Temperature dependence of spin pinning and spin-wave dispersion in nanoscopic ferromagnetic waveguides
摘要：
由于利用编码到自旋波相位或振幅中的信息在纳米尺度上执行计算操作的可能性，磁振子领域吸引了显著的关注。最近，自旋波在钇铁石榴石（YIG）波导的宽度范围内下降到50 nm和高宽比厚度在宽度接近1进行了研究。发现了一个临界宽度，低于该宽度时，交换相互作用抑制了偶极钉扎现象，系统变为非钉扎。在这里，我们继续这些调查和分析的钉扎现象和自旋波色散作为温度，厚度和材料的选择的函数。高阶模式，沿波导的有限波矢量的影响和钉扎现象对自旋波寿命的影响进行了讨论，以及梯形截面和波导的边缘粗糙度的影响。所提出的结果是特别感兴趣的潜在应用在磁器件和量子磁在低温温度下的初期领域。
英文摘要：
The field of magnonics attracts significant attention due to the possibility of utilizing information coded into the spin-wave phase or amplitude to perform computation operations on the nanoscale. Recently, spin waves were investigated in Yttrium Iron Garnet (YIG) waveguides with widths ranging down to 50 nm and aspect ratios thickness over width approaching unity. A critical width was found, below which the exchange interaction suppresses the dipolar pinning phenomenon and the system becomes unpinned. Here we continue these investigations and analyse the pinning phenomenon and spin-wave dispersions as a function of temperature, thickness and material of choice. Higher order modes, the influence of a finite wavevector along the waveguide and the impact of the pinning phenomenon on the spin-wave lifetime are discussed as well as the influence of a trapezoidal cross section and edge roughness of the waveguides. The presented results are of particular interest for potential applications in magnonic devices and the incipient field of quantum magnonics at cryogenic temperatures.
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