Spin Transport Properties of MnBi_(2)Te_(4)-Based Magnetic Tunnel Junctions  

作　　者：董新龙 贾鑫 严志 申学敏 李泽宇 乔振华 许小红 Xinlong Dong;Xin Jia;Zhi Yan;Xuemin Shen;Zeyu Li;Zhenhua Qiao;Xiaohong Xu(College of Physics and Information Engineering,Shanxi Normal University,Taiyuan 030031,China;Key Laboratory of Magnetic Molecules and Magnetic Information Materials of the Ministry of Education,Research Institute of Materials Science,Shanxi Normal University,Taiyuan 030031,China;International Center for Quantum Design of Functional Materials,University of Science and Technology of China,Hefei 230026,China;Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China)

机构地区：[1]College of Physics and Information Engineering,Shanxi Normal University,Taiyuan 030031,China [2]Key Laboratory of Magnetic Molecules and Magnetic Information Materials of the Ministry of Education,Research Institute of Materials Science,Shanxi Normal University,Taiyuan 030031,China [3]International Center for Quantum Design of Functional Materials,University of Science and Technology of China,Hefei 230026,China [4]Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China

出　　处：《Chinese Physics Letters》2023年第8期80-85,共6页中国物理快报（英文版）

基　　金：supported the National Key Research and Development Program of China(Grant No.2022YFB3505301);the Natural Science Basic Research Program of Shanxi(Grant Nos.20210302124252,202203021222219)。

摘　　要：The van der Waals heterojunctions,stacking of different two-dimensional materials,have opened unprecedented opportunities to explore new physics and device concepts.Here,combining the density functional theory with non-equilibrium Green’s function technique,we systematically investigate the spin-polarized transport properties of van der Waals magnetic tunnel junctions(MTJs),Cu/MnBi_(2)Te_(4)/MnBi_(2)Te_(4)/Cu and Cu/MnBi_(2)Te_(4)/hBN/n·MnBi_(2)Te_(4)/Cu(n=1,2,3).It is found that the maximum tunnel magnetoresistance of Cu/MnBi_(2)Te_(4)/hBN/3·MnBi_(2)Te_(4)/Cu MTJs can reach 162.6%,exceeding the system with only a single layer MnBi_(2)Te_(4).More interestingly,our results indicate that Cu/MnBi_(2)Te_(4)/h-BN/n·MnBi_(2)Te_(4)/Cu(n=2,3)MTJs can realize the switching function,while Cu/MnBi_(2)Te_(4)/h-BN/3·MnBi_(2)Te_(4)/Cu MTJs exhibit the negative differential resistance.The Cu/MnBi_(2)Te_(4)/h-BN/3·MnBi_(2)Te_(4)/Cu in the parallel state shows a spin injection efficiency of more than 83.3%.Our theoretical findings of the transport properties will shed light on the possible experimental studies of MnBi_(2)Te_(4)-based van der Waals magnetic tunneling junctions.

关 键 词：EXCEEDING EQUILIBRIUM 

分 类 号：O469[理学—凝聚态物理]