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  • Letter

Antiferromagnetic hysteresis above the spin-flop field

M. J. Grzybowski1,2,*, C. F. Schippers1, O. Gomonay3, K. Rubi4,†, M. E. Bal4, U. Zeitler4, A. Kozioł-Rachwał5, M. Szpytma5, W. Janus5 et al.

B. Kurowska6, S. Kret6, M. Gryglas-Borysiewicz2, B. Koopmans1, and H. J. M. Swagten1

  • 1Department of Applied Physics, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands
  • 2Faculty of Physics, University of Warsaw, ul. Pasteura 5, PL-02-093 Warsaw, Poland
  • 3Institute of Physics, Johannes Gutenberg-University Mainz, 55128 Mainz, Germany
  • 4High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
  • 5Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland
  • 6Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, PL-02-668 Warsaw, Poland

  • *Michal.Grzybowski@fuw.edu.pl
  • †Present address: National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
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Phys. Rev. B 107, L060403 – Published 6 February, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L060403

Abstract

Magnetocrystalline anisotropy is essential in the physics of antiferromagnets and commonly treated as a constant, not depending on an external magnetic field. However, we demonstrate that in CoO the anisotropy should necessarily depend on the magnetic field, which is shown by the spin Hall magnetoresistance of the CoO|Pt device. Below the Néel temperature CoO reveals a spin-flop transition at 240 K at 7.0 T, above which a hysteresis in the angular dependence of magnetoresistance unexpectedly persists up to 30 T. This behavior is shown to agree with the presence of the unquenched orbital momentum, which can play an important role in antiferromagnetic spintronics.

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Phys. Rev. B 107, L060403– Published 6 February, 2023
  • Received 2 September 2021
  • Revised 21 November 2022
  • Accepted 25 January 2023
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