摘要
基于微磁学理论和模拟研究电流驱动的斯格明子的移动特性。相对于纳米带,凹槽纳米带可提供更大的边缘排斥力抑制斯格明子横向移动,最大驱动电流(J_(max))和最大斯格明子移动速度(V_(max))显著增加。随着注入电流密度的增加,凹槽纳米带内斯格明子移动速度先增加到最大速度,而后减小或保持不变。通过增加边缘宽度或厚度,J_(max)和V_(max)线性增加。研究凹槽纳米带边缘厚度与宽度对斯格明子移动的调制规律,并基于微磁学理论对其进行解释。为基于纳米带结构的自旋电子器件的开发提供理论依据。
Current-induced skyrmion motion is studied with theory and simulation of micromagnetism. Compared with those in the nanostripe, the maximum driving current density(J_(max)) and the maximum skyrmion speed(V_(max)) increase significantly in a fluted nanostripe structure which provides greater skyrmion-edge repulsion force to suppress transverse displacement of the skyrmion. As the driving current density increases, the skyrmion speed increases to V_(max), and then decreases or remains unchanged. As increasing the edge width or thickness, J_(max) and V_(max) increase linearly. We show dependence of the skyrmion speed on edge thickness and width in the fluted nanostripe and explain theoretically with micromagnetics. It provides guidance for the design and development of spintronic devices based on nanostripes.
作者
张光富
张赛文
邓杨保
熊翠秀
谭伟石
ZHANG Guangfu;ZHANG Saiwen;DENG Yangbao;XIONG Cuixiu;TAN Weishi(School of information and Electronic Engineering,Hunan City University,Yiyang,Hunan 413000,China;All-Solid-State Energy Storage Materials and Devices Key Laboratory of Hunan Province,Yiyang,Hunan 413000,China)
出处
《计算物理》
CSCD
北大核心
2021年第2期199-205,共7页
Chinese Journal of Computational Physics
基金
国家自然科学基金(11604091,11547186,11947088)
湖南省自然科学基金(2018JJ2019)
湖南省教育厅优秀青年项目(16B048,19B100)资助。
关键词
磁纳米带
斯格明子
微磁学模拟
自旋转移力矩
magnetic nanostripe
skyrmion
micromagnetic simulation
spin transfer torque