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.

*This work in UM is supported by FDCT-013/2017/AMJ, CPG-2019-00022-IAPME, MYRG-2018-00142-IAPME, NSFC 91733302. In SUSTech is supported by JCYJ20170817105007999, 2019B030301001), and NSFC 2017A030310661.

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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