Micromagnetic Modeling of Parametric Amplification of Forward Volume Spin Waves by Noncollinear Surface Acoustic Waves

IF 1.1 4区物理与天体物理 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Magnetics Letters Pub Date : 2024-10-14 DOI:10.1109/LMAG.2024.3479922

Carson Rivard;Albrecht Jander;Pallavi Dhagat

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Abstract

Micromagnetic modeling is used to simulate the parametric amplification of forward volume spin waves by a surface acoustic wave (SAW) traveling noncollinearly in a yttrium–iron–garnet thin film. The angle of incidence between the signal spin wave and the SAW pump determines the strength of parametric coupling as well as the propagation direction of the resulting idler spin wave. In a collinear arrangement, where the spin wave and SAW travel together, the acoustic pump amplitude needed to achieve amplification is greater than the threshold for the parametric generation of spin waves from the thermal background. However, in a noncollinear arrangement with >35° angle of incidence between the signal spin wave and SAW pump, the coupling is enhanced and allows for continuous amplification of spin waves by more than 10× without simultaneously resulting in unconstrained growth of thermal spin waves. The angular dependence of the parametric coupling strength, as determined from the simulations, agrees qualitatively with theoretical predictions.

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非共振面声波对正向体积自旋波参数放大的微磁建模

微磁建模用于模拟在钇-铁-石榴石薄膜中非线性传播的表面声波（SAW）对前向体积自旋波的参数放大。信号自旋波与声表面波泵之间的入射角决定了参数耦合的强度以及由此产生的惰性自旋波的传播方向。在自旋波和声表面波一起传播的共线排列中，实现放大所需的声泵振幅大于从热背景中参数化产生自旋波的阈值。然而，在信号自旋波与声表面波泵之间的入射角大于 35° 的非共线布置中，耦合得到了增强，可将自旋波持续放大 10 倍以上，而不会同时导致热自旋波的无限制增长。模拟确定的参数耦合强度的角度依赖性与理论预测基本一致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Magnetics Letters PHYSICS, APPLIED-

CiteScore

2.40

自引率

0.00%

发文量

期刊介绍： IEEE Magnetics Letters is a peer-reviewed, archival journal covering the physics and engineering of magnetism, magnetic materials, applied magnetics, design and application of magnetic devices, bio-magnetics, magneto-electronics, and spin electronics. IEEE Magnetics Letters publishes short, scholarly articles of substantial current interest. IEEE Magnetics Letters is a hybrid Open Access (OA) journal. For a fee, authors have the option making their articles freely available to all, including non-subscribers. OA articles are identified as Open Access.