发表机构
University of Gothenburg; Indian Institute of Science Education and Research Bhopal; Northwestern University; Tohoku University（哥德堡大学; 印度科学教育研究所博帕尔分校; 西北大学; 东北大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用外延Co/Pt的晶体各向异性替代磁场偏置，实现无场自旋霍尔纳米振荡器，支持高于10 GHz的自激振荡及非易失性重构，为可重构自旋电子振荡器网络提供新途径。
AI 中文摘要
自旋霍尔纳米振荡器（SHNOs）是用于无线通信、神经形态计算和基于振荡器的伊辛机的纳米级微波源，但传统器件需要全局磁场偏置。在此，我们通过外延Co/Pt中的晶体各向异性替代该偏置。具有c轴位于薄膜平面内的hcp Co的生长产生了约0.36 T的各向异性场，并在纳米收缩SHNOs中实现了高于10 GHz的无场自激振荡。有效电流极性由剩余磁化强度选择，从而提供振荡状态的非易失性重构。微聚焦布里渊光散射证实非线性响应局限于纳米收缩区域。电流与各向异性轴之间角度的光刻控制调节了激发阈值，并驱动两个光谱分支从分离模式转变为单一主导分支，这与相互同步一致。这些结果确立了外延晶体各向异性作为可重构无场自旋电子振荡器和振荡器网络的实现途径。
英文摘要
Spin Hall nano-oscillators (SHNOs) are nanoscale microwave sources for wireless communication, neuromorphic computing and oscillator-based Ising machines, but conventional devices require a global magnetic bias. Here we replace this bias through crystallographic anisotropy in epitaxial Co/Pt. Growth of hcp Co with its c-axis in the film plane produces an anisotropy field of about 0.36 T and enables field-free auto-oscillations above 10 GHz in nanoconstriction SHNOs. The active current polarity is selected by the remanent magnetization, providing nonvolatile reconfiguration of the oscillation state. Micro-focused Brillouin light scattering confirms that the nonlinear response is confined to the nanoconstriction region. Lithographic control of the angle between the current and anisotropy axes tunes the excitation threshold and drives two spectral branches from separated modes to a dominant single branch, consistent with mutual synchronization. These results establish epitaxial crystallographic anisotropy as a route to reconfigurable field-free spintronic oscillators and oscillator networks.
