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  • Letter

Separating RKKY interaction from other exchange mechanisms in two-dimensional magnetic materials

Y. Zhu1,2,*,†, Y. F. Pan1,2,*, L. Ge3,*, J. Y. Fan1,2, D. N. Shi1,2, C. L. Ma4, J. Hu5,‡, and R. Q. Wu6,§

  • 1College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • 2MIIT Key Laboratory of Aerospace Information Materials and Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
  • 3School of Science, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
  • 4Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China
  • 5School of Physical Science and Technology and Institute of High Pressure Physics, Ningbo University, Ningbo 315211, China
  • 6Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA

  • *These authors contributed equally to this work.
  • †yzhu@nuaa.edu.cn
  • ‡hujun2@nbu.edu.cn
  • §wur@uci.edu
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Phys. Rev. B 108, L041401 – Published 5 July, 2023

DOI: https://doi.org/10.1103/PhysRevB.108.L041401

Abstract

We developed an effective procedure to single out the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction from the other exchange mechanisms in metallic two-dimensional (2D) magnetic materials, and applied this procedure to study two prototypical systems, 2D CrS2 and Fe3GeTe2, using first-principles calculations. In particular, the RKKY interaction is nearly independent of the lattice size in a reasonably large range and the number of CrS2 layers. In contrast, the other magnetic interactions such as superexchange strongly depend on the lattice size and thickness of CrS2 films. In Fe3GeTe2, the RKKY interaction is relatively weak and does not play a leading role in the magnetic structure, whereas the strong intralayer antiferromagnetic superexchange and interlayer ferromagnetic direct exchange dominate the magnetic configuration of Fe3GeTe2. Our work uncovers the universal role of the 2D RKKY interaction and proposes an effective way to analyze and control the magnetic coupling of 2D magnetic materials.

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Phys. Rev. B 108, L041401– Published 5 July, 2023
  • Received 5 March 2022
  • Revised 18 March 2023
  • Accepted 8 June 2023
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