后向体积磁静力自旋波的正向/反向多普勒效应

Xuhui Su, Dawei Wang, Shaojie Hu
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引用次数: 0

摘要

自旋波(SW)及其量子--磁子在未来的自旋电子器件中实现低功率信息传输方面起着至关重要的作用。在后向体磁静态自旋波(BVMSWs)中,由于偶极子-偶极子相互作用,其频散关系在低波数时显示负群速度,而在高波数时则显示正群速度,这是由交换相互作用驱动的。在这里,我们提供了一种创新方法,通过正/反自旋波多普勒效应更有效地区分波矢不同的自旋波。低波数的自旋波显示出反多普勒效应,因为它们的相位和群速度是反平行的。相反,在高波数时,由于相位和群速度平行排列,会出现正常的多普勒效应。分析自旋波多普勒效应对于理解内在相互作用至关重要,也有助于缓解自旋逻辑电路设计中的严重干扰问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Normal/inverse Doppler effect of backward volume magnetostatic spin waves
Spin waves (SWs) and their quanta, magnons, play a crucial role in enabling low-power information transfer in future spintronic devices. In backward volume magnetostatic spin waves (BVMSWs), the dispersion relation shows a negative group velocity at low wave numbers due to dipole-dipole interactions and a positive group velocity at high wave numbers, driven by exchange interactions. This duality complicates the analysis of intrinsic interactions by obscuring the clear identification of wave vectors. Here, we offer an innovative approach to distinguish between spin waves with varying wave vectors more effectively by the normal/inverse spin wave Doppler effect. The spin waves at low wave numbers display an inverse Doppler effect because their phase and group velocities are anti-parallel. Conversely, at high wave numbers, a normal Doppler effect occurs due to the parallel alignment of phase and group velocities. Analyzing the spin wave Doppler effect is essential for understanding intrinsic interactions and can also help mitigate serious interference issues in the design of spin logic circuits.
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