论文标题
用局部旋转轨道扭矩稳定指数数量的离散remanent状态
Stabilization of exponential number of discrete remanent states with localized spin-orbit torques
论文作者
论文摘要
使用$β$ -TA/NI $ _ {0.8} $ Fe $ _ {0.2} $的双层胶片，我们制造了由两个，三个和四个交叉椭圆组成的结构，这些结构分别在交叉区域内表现出形状诱导的双轴，三轴和四轴和四轴磁性的磁性磁性。可以通过施加（和去除）外部磁场来稳定由n个交叉椭圆组成的结构。但是，我们表明，随着通过单个椭圆中流动的电流引起的无现场旋转轨道扭矩，剩余状态的数量将增长到2 $^\ text {n} $。此外，当电流在不同椭圆的边缘之间流动时，剩余状态的数量跳至2 $^\ text {2n} $，其中包括在重叠区域中显示出$π$-Néel域壁的状态。相对简单的磁性结构表现出的大量可及的磁性磁状态为有趣的Spintronics应用铺平了道路，包括存储器设备。
Using bilayer films of $β$-Ta/Ni$_{0.8}$Fe$_{0.2}$, we fabricate structures consisting of two, three and four crossing ellipses which exhibit shape-induced bi-axial, tri-axial and quadro-axial magnetic anisotropy in the crossing area, respectively. Structures consisting of N crossing ellipses can be stabilized in 2N remanent states by applying (and removing) an external magnetic field. However, we show that with field-free spin-orbit torques induced by flowing currents in individual ellipses, the number of remanent states grows to 2$^\text{N}$. Furthermore, when the current flows between the edges of different ellipses the number of remanent states jumps to 2$^\text{2N}$, including states which exhibit a $π$-Néel domain wall in the overlap area. The very large number of accessible remanent magnetic states that are exhibited by the relatively simple magnetic structures paves the way for intriguing spintronics applications including memory devices.
