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.
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)
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)。
