Gradual magnetization switching via domain nucleation driven by spin-orbit torque
Gradual magnetization switching via domain nucleation driven by spin-orbit torque
复制标题
通过自旋轨道扭矩驱动的磁畴成核实现逐渐磁化切换
DOI：
10.1063/5.0035667
复制
发表时间：
2021-01-18
影响因子：
4
通讯作者：
Samardak, A. S.
中科院分区：
文献类型：
--
作者：
Wan, C. H.;Stebliy, M. E.;Samardak, A. S.
由自旋轨道力矩（SOT）驱动的逐渐磁化切换是自旋电子学方式的神经形态计算的首选。在这里，我们已经应用聚焦离子束选择性地照射图案化区域的Pt/Co/MgO条与垂直磁各向异性，软化的照明区域，并实现逐步切换由SOT驱动的成核过程。结果表明，较大的面内场有助于降低成核势垒，增加转变过程中的成核畴数和中间态数，最终使转变曲线平坦化.我们提出了一个唯象模型来解释磁化强度的电流依赖性和成核畴数对外加电流和磁场的依赖性。本研究可能会促进适用于神经形态计算应用的SOT器件的诞生。由AIP Publishing授权出版。
Gradual magnetization switching driven by spin orbit torque (SOT) is preferred for neuromorphic computing in a spintronic manner. Here we have applied focused ion beam to selectively illuminate patterned regions in a Pt/Co/MgO strip with perpendicular magnetic anisotropy, soften the illuminated areas, and realize the gradual switching by a SOT-driven nucleation process. It is found that a large in-plane field is helpful to reduce the nucleation barrier, increase the number of nucleated domains and intermediate states during the switching progress, and finally flatten the switching curve. We proposed a phenomenological model for descripting the current dependence of magnetization and the dependence of the number of nucleation domains on the applied current and magnetic field. This study may promote the birth of SOT devices applicable in neuromorphic computing applications. Published under license by AIP Publishing.