摘要
Two-dimensional (2D) magnets have broad application prospects in the spintronics,but how to effectively control them with a small electric field is still an issue.Here we propose that 2D magnets can be efficiently controlled in a multiferroic heterostructure composed of 2D magnetic material and perovskite oxide ferroelectric (POF) whose dielectric polarization is easily flipped under a small electric field.We illustrate the feasibility of such strategy in the bilayer CrI_(3)/BiFeO_(3)(001) heterostructure by using the first-principles calculations.Different from the traditional POF multiferroic heterostructures which have strong interface interactions,we find that the interface interaction between CrI_(3) and BiFeO_(3)(001) is van der Waals type.Whereas,the heterostructure has particular strong magnetoelectric coupling where the bilayer CrI_(3) can be efficiently switched between ferromagnetic and antiferromagnetic types by the polarized states P↑ and P↓ of BiFeO_(3)(001).We also discover the competing effect between electron doping and the additional electric field on the interlayer exchange coupling interaction of CrI_(3),which is responsible to the magnetic phase transition.Our results provide a avenue for the tuning of 2D magnets with a small electric field.
基金
This work is supported by National Natural Science Foundation of China(Nos.12074301 and 12004295)
National Key R&D Program of China(2018YFB0407600)
the Science Fund for Distinguished Young Scholars of Hunan Province(No.2018JJ1022)
P.L.thanks China’s Postdoctoral Science Foundation funded project(No.2020M673364)
the Open Project of the Key Laboratory of Computational Physical Sciences(Ministry of Education).Z.X.G.thanks the Fundamental Research Funds for Central Universities(No.xzy012019062)
Open Research Fund of Key Laboratory of Polar Materials and Devices,Ministry of Education.
