APS Logo

Uncovering two-dimensional intrinsic ferromagnetism from host antiferromagnet via super-exchange interaction modulation

ORAL

Abstract

Two-dimensional ferromagnetic semiconductors have been gaining great attention as they incorporate low-dimensionality, ferromagnetism and semiconductivity, which are promising for next-generation multifunctional spintronics. Here, we report an effective strategy to design ferromagnetic single crystals based on our previous extended super-exchange theory for polyvalent anion materials, e.g. CrOCl. We reveal that the magnetic order of one specific super-exchange cation-anion-cation path in CrOCl prototype is directly related to all anions' valence state. Choosing suitable anions (A1=VIIA, A2=VA element) in sites, all super-exchange paths are tuned into strongly ferromagnetic, leading to designed materials are intrinsic ferromagnets companied with high Curie temperatures. On the basis of the explored strategy and first-principles calculations, two stable monolayers CrIP and CrIAs are predicted to be ferromagnetic half-metal and semiconductor, respectively. The Curie temperature, estimated by Monte Carlo simulation using Heisenberg model, is as high as 1050 K and 655 K.

–

Presenters

  • Fang Zhang

    Institute of Applied Physics and Materials Engineering, University of Macau

Authors

  • Fang Zhang

    Institute of Applied Physics and Materials Engineering, University of Macau

  • xingqiang Shi

    Department of Physics, Southern University of Science and Technology of China

  • Steven Louie

    University of California at Berkeley, and Lawrence Berkeley National Laboratory, Department of Physics, University of California, Berkeley, Berkeley, California 94720, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, C, University of California, Berkeley, Department of Physics, University of California, Berkeley, Lawrence Berkeley National Laboratory and University of California at Berkeley, Department of Physics, University of California at Berkeley and Lawrence Berkeley National Laboratory, Department of Physics, UC Berkeley, Physics, Unviersyt of Calfornia, Berkeley, Physics, University of California, Berkeley, Physics, University of California, Berkeley and Lawrence Berkeley National Lab

  • Zi Kang Tang

    Institute of Applied Physics and Materials Engineering, University of Macau