近日，瑞典哥德堡大学的Johan Akerman&Akash Kumar及其研究团队取得一项新进展。经过不懈努力，他们实现了自旋霍尔纳米振荡器中自旋波介导的相互同步和相位调谐。相关研究成果已于2025年1月8日在国际知名学术期刊《自然—物理学》上发表。

该研究团队证明了两个纳米收窄自旋霍尔纳米振荡器之间的可变相位耦合，及其通过传播的自旋波实现的相互同步。通过电学测量和相位分辨微聚焦布里渊光散射显微镜，研究人员证明相互同步的相位，可以通过调节驱动电流或施加的外场来调谐。该研究的微磁学模拟探索了，利用电压门控实现相位可调性的方法。

这项研究结果提升了相互同步自旋霍尔纳米振荡器的功能，并为基于自旋波逻辑的器件应用开辟了可能性。

据悉，自旋轨道转矩可以驱动纳米缩窄自旋霍尔纳米振荡器中，传播自旋波模式的自激振荡。这些模式促进了长程耦合和控制其相位的可能性，这是器件应用的关键方面。

附：英文原文

Title: Spin-wave-mediated mutual synchronization and phase tuning in spin Hall nano-oscillators

Author: Kumar, Akash, Chaurasiya, Avinash Kumar, Gonzlez, Victor H., Behera, Nilamani, Alemn, Ademir, Khymyn, Roman, Awad, Ahmad A., Akerman, Johan

Issue&Volume: 2025-01-08

Abstract: Spin–orbit torque can drive auto-oscillations of propagating spin-wave modes in nano-constriction spin Hall nano-oscillators. These modes facilitate both long-range coupling and the possibility of controlling their phase, which is a crucial aspect for device application. Here, we demonstrate variable-phase coupling between two nano-constriction spin Hall nano-oscillators and their mutual synchronization driven by propagating spin waves. Using electrical measurements and phase-resolved micro-focused Brillouin light scattering microscopy, we show that the phase of the mutual synchronization can be tuned by modulating the drive current or the applied field. Our micromagnetic simulations explore the phase tunability using voltage gating. Our results advance the capabilities of mutually synchronized spin Hall nano-oscillators and open the possibilities for applications in spin-wave logic-based devices.

DOI: 10.1038/s41567-024-02728-1

Source: https://www.nature.com/articles/s41567-024-02728-1