Ferrimagnetic insulators promise low-power and high-speed spintronic applications, thanks to their insulating nature and fast dynamics near compensation points. In a ferrimagnetic insulator/heavy metal heterostructure, we investigate field- and current-induced magnetization switching at various temperatures and observe distinct magnetization switching behaviors owing to spin–orbit torque (SOT) and heating effect. We have realized SOT switching across the magnetization compensation temperature and discovered that the SOT switching is strongly heat-assisted: the temperature is always above the compensation temperature while the SOT switching happens in our case. Moreover, we show that the SOT efficiency is strongly magnetization-dependent by characterizing the current dependence of SOT efficiency and explaining the anomalous SOT switching back phenomena in the presence of a titled external field. Our results reveal the critical role of Joule heating on the dynamics of magnetic insulators and pave the way for the application of spintronic devices based on magnetic insulators.

中文翻译：

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亚铁磁绝缘体的强热辅助自旋轨道扭矩切换

由于其绝缘特性和补偿点附近的快速动态，亚铁磁绝缘体有望实现低功率和高速自旋电子应用。在亚铁磁绝缘体/重金属异质结构中，我们研究了不同温度下的场感应和电流感应磁化切换，并观察到由于自旋轨道扭矩 (SOT) 和热效应导致的不同磁化切换行为。我们已经实现了跨越磁化补偿温度的 SOT 切换，并发现 SOT 切换具有很强的热辅助性：在我们的案例中发生 SOT 切换时，温度始终高于补偿温度。而且，我们通过表征 SOT 效率的电流依赖性并解释在存在标题外场的情况下异常 SOT 切换回现象，表明 SOT 效率强烈依赖于磁化。我们的研究结果揭示了焦耳热对磁绝缘体动力学的关键作用，并为基于磁绝缘体的自旋电子器件的应用铺平了道路。