摘要
在纳米尺度上实现对低维自旋结构可逆、低能耗的调控,对于自旋电子学器件在未来的应用十分重要.磁性涡旋是一种典型的纳米磁畴结构,对称性由极性和旋性决定,传统手段磁场已经实现了对二者的控制.然而,因为磁性涡旋具有时间反演对称性及面内各向同性,通过电场实现对磁性涡旋的控制依旧存在挑战.本文构建了多铁性异质结,通过施加面内双轴脉冲电场,利用空间动态应变的特殊机制,可逆地实现了对磁性涡旋旋性的定向翻转.相场模拟揭示了磁弹能量在空间变化的起因,获得了磁性涡旋畴旋性翻转动力学过程.电场对磁性涡旋畴的定向控制,成功地展示了一种将低维磁性结构集成于低能耗的磁电薄膜器件的新途径.
The ability to control magnetic vortex is critical for their potential applications in spintronic devices.Traditional methods including magnetic field,spin-polarized current etc.have been used to flip the core and/or reverse circulation of vortex.However,it is challenging for deterministic electric-field control of the single magnetic vortex textures with time-reversal broken symmetry and no planar magnetic anisotropy.Here it is reported that a deterministic reversal of single magnetic vortex circulation can be driven back and forth by a space-varying strain in multiferroic heterostructures,which is controlled by using a bi-axial pulsed electric field.Phase-field simulation reveals the mechanism of the emerging magnetoelastic energy with the space variation and visualizes the reversal pathway of the vortex.This deterministic electric-field control of the single magnetic vortex textures demonstrates a new approach to integrate the low-dimensional spin texture into the magnetoelectric thin film devices with low energy consumption.
作者
张跃林
王传寿
黄厚兵
鲁京迪
梁仁荣
刘坚
彭仁赐
张钦彤
张庆华
王静
谷林
韩秀峰
陈龙庆
Ramamoorthy Ramesh
南策文
张金星
Yuelin Zhang;Chuanshou Wang;Houbing Huang;Jingdi Lu;Renrong Liang;Jian Liu;Renci Peng;Qintong Zhang;Qinghua Zhang;Jing Wang;Lin Gu;Xiu-Feng Han;Long-Qing Chen;Ramamoorthy Ramesh;Ce-Wen Nan;Jinxing Zhang(Department of Physics,Beijing Normal University,Beijing 100875,China;Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China;Tsinghua National Laboratory for Information Science and Technology,Institute of Microelectronics,Tsinghua University,Beijing 100084,China;Department of Materials Science and Engineering and Department of Physics,University of California,Berkeley and Materials Science Division,Lawrence Berkeley National Laboratory,Berkeley,CA 94720,USA;State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;Beijing National Laboratory of Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Department of Materials Science and Engineering,The Pennsylvania State University,University Park,PA 16802,USA)
基金
supported by the National Key Research and Development Program of China(2016YFA0302300 and 2017YFA0206200)
Basic Science Center Program of the National Natural Science Foundation of China(51788104)
National Natural Science Foundation of China(11974052,51972028)
Beijing Natural Science Foundation(Z190008)
Chinese Academy of Sciences Interdisciplinary Innovation Team
funded by the Director,Office of Science,Office of Basic Energy Sciences,Materials Science and Engineering Department of the US Department of Energy(DOE)in the Quantum Materials Program(KC2202)under Contract No.DEAC02-05CH11231
the support by the Science Alliance Joint Directed Research&Development Program
the Transdisciplinary Academy Program at the University of Tennessee。
关键词
定向控制
动态应变
脉冲电场
低能耗
翻转
相场模拟
多铁性
磁性
Deterministic reversal
Electric-field control
Space-varying strain
Single magnetic vortex
Multiferroic heterostructures
