论文标题
基于铁磁金属/铁磁性绝缘体异质结构的混合自旋厅纳米振荡器
Hybrid spin Hall nano-oscillators based on ferromagnetic metal/ferrimagnetic insulator heterostructures
论文作者
论文摘要
旋转孔纳米振荡器（SHNOS）是有前途的自旋设备，可以在纳米级设备中实现当前受控的GHz频率信号，用于神经形态计算和创建ISING系统。但是，传统的SHNO（基于过渡金属的设备）具有高自动振荡阈值电流以及低质量因素和输出功率。在这里，我们以薄膜（LAFO）薄膜的形式以薄磁力 - 磁性金属纳米线和低阻尼的铁磁绝缘子（Lafo）薄膜的形式演示了一种新型的杂种SHNO。此类SHNO的出色特征与较大的自旋细胞角度和体积的激发有关。我们进一步发现，铁磁性绝缘子的存在增强了自旋边缘模式的自动振荡振幅，与我们的微磁建模一致。这种混合动力SHNO扩展了Spintronic应用程序，包括提供新的SHNOS用于神经形态计算和推进镁的方法。
Spin-Hall nano-oscillators (SHNOs) are promising spintronic devices to realize current controlled GHz frequency signals in nanoscale devices for neuromorphic computing and creating Ising systems. However, traditional SHNOs -- devices based on transition metals -- have high auto-oscillation threshold currents as well as low quality factors and output powers. Here we demonstrate a new type of hybrid SHNO based on a permalloy (Py) ferromagnetic-metal nanowire and low-damping ferrimagnetic insulator, in the form of epitaxial lithium aluminum ferrite (LAFO) thin films. The superior characteristics of such SHNOs are associated with the excitation of larger spin-precession angles and volumes. We further find that the presence of the ferrimagnetic insulator enhances the auto-oscillation amplitude of spin-wave edge modes, consistent with our micromagnetic modeling. This hybrid SHNO expands spintronic applications, including providing new means of coupling multiple SHNOs for neuromorphic computing and advancing magnonics.
