Magnetic insulators, in particular, rare-earth iron garnets, have low damping compared to metallic ferromagnetic materials due to lack of conduction electrons. In analogy to spin-transfer-torque devices, the low-damping nature is presumed to be an advantage for spintronic applications. We report that perpendicular magnetic anisotropy material with low damping actually does not favor reliable spin–orbit torque (SOT) switching. Increasing damping, introducing interfacial Dzyaloshinskii–Moriya interactions, or field-like torques may help SOT switching in some cases. Having notches in a nanometer-scale element, which is a more realistic size for practical applications, can also improve switching stability.

中文翻译：

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低阻尼磁绝缘体中的自旋轨道扭矩切换：微磁研究

磁性绝缘体，特别是稀土铁石榴石，由于缺乏传导电子，与金属铁磁材料相比具有低阻尼。与自旋转移扭矩装置类似，低阻尼特性被认为是自旋电子应用的优势。我们报告说，具有低阻尼的垂直磁各向异性材料实际上不利于可靠的自旋轨道扭矩 (SOT) 切换。在某些情况下，增加阻尼、引入界面 Dzyaloshinskii-Moriya 相互作用或类似场的扭矩可能有助于 SOT 切换。在纳米级元件中具有凹口，这是实际应用中更现实的尺寸，也可以提高开关稳定性。