Zeng Xiangyu, Ye Ge, Huang Shuyi, Zhang Liang, Xu Hongsheng, Liu Yulu, Kuang Haoze, Ma Boyang, Luo Jikui, Lu Xin, Wang Xiaozhi
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China.
J Phys Condens Matter. 2022 Jun 24;34(34). doi: 10.1088/1361-648X/ac76fe.
The magneto-transport properties of two-dimensional (2D) FeGeTe(FGT) nano-flakes are carefully investigated with the variation of the temperature and the direction of the applied magnetic field (). Four magnetoresistance (MR) behavior are obtained at different temperatures withparalleling the flake's surface, because of the competition between the merging of different domains, spin fluctuation, and the spin momentum flipping. Different from the reported negative MR of bulk FGT, 2D FGT shows a positive MR behavior with the increase ofat a low temperature in a lowrange, owning to the domination of the spin momentum flipping induced by the weakening of the coupling between different layers with the decrease of the thickness of the FGT flake. The angle-dependence of the FGT MR is also investigated and can be well explained by the competition mentioned above.
二维（2D）FeGeTe（FGT）纳米片的磁输运特性随温度和外加磁场方向的变化进行了仔细研究。由于不同畴的合并、自旋涨落和自旋动量翻转之间的竞争，在与薄片表面平行的情况下，在不同温度下获得了四种磁电阻（MR）行为。与报道的块状FGT的负磁电阻不同，二维FGT在低温低范围内随增加呈现正磁电阻行为，这是由于随着FGT薄片厚度的减小，不同层之间耦合减弱导致自旋动量翻转占主导。还研究了FGT磁电阻的角度依赖性，并且可以用上述竞争很好地解释。
