超导涡旋磁场对纳米盘中拓扑磁织构的影响  

The Influence of Superconductor-vortex Magnetic Fields on Confined Topological Magnetic Textures in Nanodisks

作　　者：吴鸿业[1] 宋子龙 陈梦蝶 徐宝[1] WU Hongye;SONG Zilong;CHEN Mengdie;XU Bao(Department of Physics Sciences and Technologies,Baotou Teachers'College,Baotou 014030,China;Tongliao Fifth Senior High School,Tongliao 028000,China)

机构地区：[1]包头师范学院物理科学与技术学院,内蒙古包头014030 [2]通辽第五中学,内蒙古通辽028000

出　　处：《山西大学学报（自然科学版）》2024年第6期1246-1256,共11页Journal of Shanxi University(Natural Science Edition)

基　　金：国家自然科学基金(61565013)。

摘　　要：当用于赛道磁存储时,超导涡旋是操纵磁斯格明子的方案之一。通过数值求解Ginzburg-Landau方程和微磁学模拟研究了超导涡旋产生的磁场对纳米盘中斯格明子磁织构和双半子磁织构的影响。研究结果表明在超导涡旋磁场中双半子不稳定,转变成均一磁化单畴态,斯格明子能稳定存在。通过改变纳米盘中斯格明子磁织构受到的涡旋磁场,不同尺寸纳米盘中斯格明子磁织构的能量,尺寸和壁宽发生相似的演化行为,只存在定量的差别。我们将其归因于均匀磁化区与畴壁区对超导涡旋磁场的变化有不同的响应行为。改变涡旋磁场时,斯格明子中心相对于纳米盘中心发生偏移,该偏移沿平移方向存在振荡行为,沿垂直方向的偏移量没有振荡行为。我们将初始偏移量归因于斯格明子磁织构与超导涡旋之间存在微弱的钉扎效应。Superconducting vortices offer a potential scheme for manipulating magnetic skyrmions,and this paper explores the effects of the magnetic fields generated by such vortices on the magnetic texture of both skyrmions and bimerons confined in nanodisks using micromagnetic simulations.Specifically,we investigate the energy,size and wall width of the skyrmion magnetic texture in nanodisks of different sizes as the horizontal spacing between the center of the superconducting vortex and the center of the nanodisks is increased.We find that while these factors undergo similar behavior across different sized nanodisks,there are quantitative differences that can be attributed to the varied response of the uniform magnetization and domain wall regions to the magnetic field generated by the superconducting vortex.Additionally,we observe oscillatory behavior in the offset of the center of the skyrmion relative to the center of the nanodisks along the translational direction,but no such behavior perpendicular to this direction.This initial offset is due to a weak pinning effect between the skyrmion magnetic texture and the superconducting vortex.Finally,we find that bimerons are unstable in the superconducting-vortex magnetic field and transition to a uniform magnetization state,likely the result of the poorer stability of bimerons in the stray field.

关 键 词：超导涡旋 磁斯格明子 双半子 微磁学模拟 

分 类 号：O4[理学—物理]