自旋电子学
Weyl半金属
铁磁性
凝聚态物理
Berry连接和曲率
拓扑(电路)
磁性
半金属
物理
材料科学
带隙
几何相位
数学
组合数学
作者
Jiahao Han,Brooke C. McGoldrick,Chung-Tao Chou,Taqiyyah Safi,Justin T. Hou,Luqiao Liu
摘要
The introduction of magnetic moments to topological materials provides rich opportunities for studying the interplay among magnetism, electron correlation, and topological orders, which can give rise to exotic magnetoelectric effects and allow one to manipulate the topological band structure via spintronic approaches. Here, we report current-induced switching in a thin film of ferromagnetic Weyl semimetal Co2MnGa with perpendicular magnetic anisotropy, via the spin–orbit torque from a neighboring heavy metal Pt. The reversal of the large anomalous Hall signal indicates an effective electrical control of the Berry curvatures associated with the Weyl nodes in the topological band structure. The efficiency of the spin–orbit torque switching is calibrated to be comparable to that in conventional ferromagnets. Given the compatibility of Co2MnGa films with various spintronic devices and techniques, our work represents an essential step toward memory and computing devices built by topological ferromagnetic materials.
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