Design of a novel bilayered structure of ferromagnetic metal and nonmagnetic insulator wires while maintaining the distance between the constituent skyrmions
Design of a novel bilayered structure of ferromagnetic metal and nonmagnetic insulator wires while maintaining the distance between the constituent skyrmions
复制标题
设计一种新型铁磁金属和非磁性绝缘体线双层结构，同时保持组成斯格明子之间的距离
DOI：
10.1088/1361-6463/ac941d
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Honda Syuta
中科院分区：
文献类型：
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作者：
Kato Masataka;Ohsawa Tomokatsu;Honda Syuta
基于磁skyrmion的赛道存储器是用于存储由低功率驱动的信息的高密度存储器，其中skyrmion的排列以二进制数字组合的形式存储。这种安排是改变的基础上的skyrmion运动所产生的自旋转移扭矩的影响。我们提出了一种新的分层结构的铁磁金属（FM）线/绝缘体线/FM线中的skyrmions移动，同时保持的安排。它由两个垂直磁化的FM线组成。其中一个包含几个skyrmions，它们充当二进制数字（数据skyrmions）。另一条线由足够数量的紧密堆积的skyrmions组成，允许自旋极化电流流动。偶极-偶极相互作用在这两个FM线之间起作用。数据skyrmion的运动是由压缩skyrmion的电流引起的运动引起的。通过微磁学方法模拟了Skyrmions的运动。数据skyrmion移动，同时保持每个skyrmion之间的距离。数据skyrmion的模拟位置由流过另一根导线的电流控制。稳定数据skyrmion运动具有阈值电流。当电流大于阈值电流时，skyrmion断裂，和/或skyrmion之间的距离断裂。阈值电流密度随着真空层厚度的增加而减小，随着FM线流动电流的厚度的增加而增加。我们的研究结果表明，在所提出的结构中的skyrmion运动可以驱动skyrmion的自旋电流密度低于耦合颗粒/连续结构和边缘缺口纳米线结构。该结构可用于开发基于Skyrmion运动的低功耗操作装置。
Magnetic-skyrmion-based racetrack memory is a high-density memory for storing information driven by low-power, wherein the arrangement of skyrmions is stored in the form of binary digit combinations. This arrangement is altered based on the skyrmion motion resulting from the influence of the spin-transfer torque. We propose a novel layered structure of a ferromagnetic metal (FM) wire/nonmagnetic insulator wire/FM wire in which the skyrmions move while maintaining the arrangement. It consists of two FM wires that are perpendicularly magnetized. One of these comprises several skyrmions, which act as binary digits (data skyrmions). The other wire constitutes a sufficient number of skyrmions that are closely packed and allow the spin-polarized current to flow. A dipole–dipole interaction acts between these two FM wires. The motion of the data skyrmion is induced by the current-induced motion of the packed skyrmion. The motion of skyrmions is simulated via micromagnetic approaches. The data skyrmions move while maintaining the distance between each skyrmion. The analog position of the data skyrmion is controlled by the current flowing through another wire. The stable data skyrmion motion has a threshold current. When the current is larger than the threshold current, the skyrmion breaks, and/or the distance between skyrmions breaks. The threshold current density is found to decrease with an increasing vacuum layer thickness and increase with increasing thickness of the FM wire flowing current. Our results show that the skyrmion motion in the proposed structure can drive skyrmions with a spin-current density lower than that of the coupled granular/continuous structure and the edge-notched nanowire structure. This structure can be used in developing low-power operational devices based on skyrmion motion.