Nakatani Yoshinobu, Yamada Keisuke, Hirohata Atsufumi
Graduate School of Informatics and Engineering, University of Electro-Communications, Chofu, Tokyo, Japan.
Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Gifu-shi, Gifu, Japan.
Sci Rep. 2021 Apr 16;11(1):8415. doi: 10.1038/s41598-021-87742-6.
Recently many works on magnetic memories and logic circuits, which use a magnetic skyrmion have been reported. Previously we micromagnetically simulated a method to switch a chirality of a magnetic skyrmion formed in a magnetic thin film by introducing a pulsed heat spot. In this paper, we propose a method to discriminate the chirality of a skyrmion in a branched nanowire by using spin-orbit torque (SOT) and spin-transfer torque (STT), and confirm the validity of the method by using simulation. The simulated results show that the motion changes depending on the chirality when additional SOT is applied on a skyrmion moving in a branch by STT. This method can be used as a fundamental building block for electrical detection in memory and logic devices using the chirality of skyrmions as a data bit in addition to the presence (and polarity) of the skyrmions as conventionally used, which can be lead to multiple-valued operation.
最近，已有许多关于使用磁斯格明子的磁存储器和逻辑电路的研究报道。此前，我们通过微磁模拟提出了一种方法，即通过引入脉冲热斑来切换在磁性薄膜中形成的磁斯格明子的手性。在本文中，我们提出了一种利用自旋轨道转矩（SOT）和自旋转移转矩（STT）来区分分支纳米线中斯格明子手性的方法，并通过模拟验证了该方法的有效性。模拟结果表明，当通过STT在分支中移动的斯格明子上施加额外的SOT时，其运动变化取决于手性。除了像传统那样利用斯格明子的存在（和极性）之外，该方法还可以用作基于斯格明子手性作为数据位的存储器和逻辑器件中电检测的基本构建模块，这可能会导致多值操作。
