Zhao Xuebing, Tang Jin, Pei Ke, Wang Weiwei, Lin Shi-Zeng, Du Haifeng, Tian Mingliang, Che Renchao
Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Department of Materials Science, Fudan University, Shanghai200438, China.
School of Physics and Optoelectronics Engineering Science, Anhui University, Hefei230601, China.
Nano Lett. 2022 Nov 23;22(22):8793-8800. doi: 10.1021/acs.nanolett.2c02061. Epub 2022 Nov 4.
We report the current-induced creation of magnetic skyrmions in a chiral magnet FeGe nanostructure by using Lorentz transmission electron microscopy. We show that magnetic skyrmions with controllable polarity can be transferred from the helical ground state simply by controlling the direction of the current flow at zero magnetic fields. The force analysis and symmetry consideration, backed up by micromagnetic simulations, well explain the experimental results, where magnetic skyrmions are created because of the edge instability of the helical state in the presence of spin-transfer torque. The on-demand generation of skyrmions and control of their polarity by electric current without the need for a magnetic field will enable novel purely electric-controlled skyrmion devices.
我们报告了通过洛伦兹透射电子显微镜在一种手性磁体FeGe纳米结构中利用电流诱导产生磁斯格明子的研究。我们表明，在零磁场下，只需控制电流方向，具有可控极性的磁斯格明子就能从螺旋基态转移出来。在微磁模拟的支持下，力分析和对称性考虑很好地解释了实验结果，即在自旋转移力矩存在的情况下，由于螺旋态的边缘不稳定性而产生了磁斯格明子。无需磁场，通过电流按需产生斯格明子并控制其极性，将实现新型的纯电控斯格明子器件。
