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Room-Temperature Ferromagnetism, Perpendicular Anisotropy, and Reverse Magnetostriction in 2D MnGaN

ORAL

Abstract

MnGaN-2D has been discovered as an ultimately-thin (2D) DMS material showing 300 K ferromagnetism as demonstrated using spin-polarized scanning tunneling microscopy and confirmed by density functional theory revealing highly spin-split and spin-polarized manganese states.[1] SQUID magnetometry confirms these results and finds a high spin-polarization of ∼79% at room temperature and perpendicular magnetic anisotropy.[2] Spin-orbit coupling is included in the first-principles theoretical calculations, which indicate either in-plane or out-of-plane anisotropy, depending on the type of strain. Clear evidence for both compressive and tensile local lattice strains is also found by detailed analysis of atomic resolution STM images. Furthermore, scanning tunneling spectroscopy finds fluctuations in the electronic position of the filled states manganese peak, which is also found to depend on lattice strain in the theoretical calculations, thus indicating a connection between electronic states and magnetic anisotropy.

[1] Yingqiao Ma et al., Nano Letters, Vol. 18, p. 158 (2018)
[2] Yingqiao Ma et al., Physical Review Materials, Vol. 4, p. 064006 (2020)

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Presenters

  • Yingqiao Ma

    Nanoscale and Quantum Phenomena Institute, Department of Physics and Astronomy, Ohio University

Authors

  • Yingqiao Ma

    Nanoscale and Quantum Phenomena Institute, Department of Physics and Astronomy, Ohio University

  • Diego Hunt

    Departamento de Fisica de la Materia Condensada, GIyA, CAC, Comision Nacional de Energia Atomica, Buenos Aires, Argentina

  • Kengyuan Meng

    Physics Department, The Ohio State University, Columbus, Ohio 43210

  • Tyler Erickson

    Nanoscale and Quantum Phenomena Institute, Department of Physics and Astronomy, Ohio University

  • Fengyuan Yang

    Ohio State Univ - Columbus, Deparment of Physics, The Ohio State University, Department of Physics, The Ohio State University, Physics, The Ohio State University, Department of Physics, Ohio State University, The Ohio State University, Physics, Ohio State University, Physics Department, The Ohio State University, Columbus, Ohio 43210

  • Maria Andrea Barral

    Departamento de Fisica de la Materia Condensada, GIyA, CAC, Comision Nacional de Energia Atomica, Buenos Aires, Argentina

  • Valeria Ferrari

    Departamento de Fisica de la Materia Condensada, GIyA, CAC, Comision Nacional de Energia Atomica, Buenos Aires, Argentina

  • Arthur Smith

    Ohio University, Department of Physics and Astronomy, Ohio University, Nanoscale and Quantum Phenomena Institute, Department of Physics and Astronomy, Ohio University