Magnetoresistance studies of two-dimensional Fe3GeTe2nano-flake

Xiangyu Zeng; Ge Ye; Shuyi Huang; Liang Zhang; Hongsheng Xu; Yulu Liu; Haoze Kuang; Boyang Ma; Jikui Luo; Xin Lu; Xiaozhi Wang

doi:10.1088/1361-648X/ac76fe

Magnetoresistance studies of two-dimensional Fe₃GeTe₂nano-flake

J Phys Condens Matter. 2022 Jun 24;34(34). doi: 10.1088/1361-648X/ac76fe.

Authors

Xiangyu Zeng¹, Ge Ye², Shuyi Huang³, Liang Zhang⁴, Hongsheng Xu⁵, Yulu Liu¹, Haoze Kuang¹, Boyang Ma¹, Jikui Luo¹, Xin Lu^{2

6}, Xiaozhi Wang¹

Affiliations

¹ College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
² Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China.
³ Shanghai Precision Metrology and Test Research Institute, 3888 Yuanjiang Road, Shanghai 201109, People's Republic of China.
⁴ Research Center for Humanoid Sensing and Perception, Zhejiang Lab, Hangzhou 311100, People's Republic of China.
⁵ Industry-Education-Research Institute of Advanced Materials and Technology for Integrated Circuits, Anhui University, 111 Jiulong Road, Hefei 230601, People's Republic of China.
⁶ Zhejiang Province Key Laboratory of Quantum Technology and Device, Zhejiang University, Hangzhou 310027, People's Republic of China.

PMID: 35675805
DOI: 10.1088/1361-648X/ac76fe

Abstract

The magneto-transport properties of two-dimensional (2D) Fe₃GeTe₂(FGT) nano-flakes are carefully investigated with the variation of the temperature and the direction of the applied magnetic field (B). Four magnetoresistance (MR) behavior are obtained at different temperatures withBparalleling 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 ofBat a low temperature in a lowBrange, 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.

Keywords: Fe3GeTe2; magnetic domain merging; negative magnetoresistance; spin fluctuation; spin momentum flipping.