Co/Fe_3GaTe_2异质结构中自旋重取向转变的电热控制
Electrothermal control of spin-reorientation transition in Co/Fe_3GaTe_2 heterostructures
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中文总结 AI 辅助
研究Co/Fe_3GaTe_2异质结构中自旋重取向转变，通过焦耳热削弱FGaT各向异性实现热控和电热控制，电驱动装置有匹配回线演变，无Co的FGaT装置证明相关特性，展示了电热各向异性竞争对范德华磁性控制的作用。
中文摘要 AI 辅助
范德华磁体中磁各向异性的电控制是可重构二维自旋电子学的关键一步，但传统金属铁磁体与范德华磁体在直接界面处的竞争情况尚待探索。本文展示了Co/Fe_3GaTe_2（FGaT）异质结构中自旋重取向转变的可逆热控和电热控制。焦耳热削弱FGaT各向异性，异质结构在约311K（远低于居里温度）时从面外主导态转变为面内主导态，符合Co覆盖层与FGaT间的交换介导各向异性竞争。电驱动装置在80 - 100mW功率窗口内有匹配的回线演变，在无Co的FGaT装置中，克尔显微镜追踪到开关转变为功率可调的畴成核势垒，并证明在15mW阈值附近有功率阈值、场辅助磁化反转。这些结果证明电热各向异性竞争是热辅助和器件级控制范德华磁性的途径。
英文摘要
Electrical control of magnetic anisotropy in van der Waals (vdWs) magnets is a key step toward reconfigurable two-dimensional spintronics, yet how a conventional metallic ferromagnet competes with a van der Waals magnet across a direct interface has remained largely unexplored. Here we demonstrate reversible thermal and electrothermal control of a spin-reorientation transition in Co/Fe_3GaTe_2 (FGaT) heterostructures. As Joule heating weakens the FGaT anisotropy, the heterostructure switches from an out-of-plane- to an in-plane-dominated state at a reorientation temperature of approximately 311 K, well below the Curie temperature, consistent with an exchange-mediated anisotropy competition between the Co overlayer and FGaT. An electrically driven device shows a closely matching loop evolution within an 80-100 mW power window, reversibly over five measurement cycles, consistent with an electrothermal origin. In a Co-free FGaT device, Kerr microscopy traces the switching to a power-tunable domain nucleation barrier and demonstrates power-thresholded, field-assisted magnetization reversal at a threshold near 15 mW. These results demonstrate electrothermal anisotropy competition as a route to heat-assisted and device-level control of vdWs magnetism.
