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  • Letter

Anisotropy of antiferromagnetic domains in a spin-orbit Mott insulator

Longlong Wu1,*, Wei Wang1, Tadesse A. Assefa1,2, Ana F. Suzana1, Jiecheng Diao3, Hengdi Zhao4, Gang Cao4, Ross J. Harder5, Wonsuk Cha5 et al.

Kim Kisslinger6, Mark P. M. Dean1, and Ian K. Robinson1,3,†

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 3London Centre for Nanotechnology, University College London, London WC1E 6BT, United Kingdom
  • 4Department of Physics, University of Colorado at Boulder, Boulder, Colorado 80309, USA
  • 5Advanced Photon Source, Argonne National Laboratory, Illinois 60439, USA
  • 6Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11793, USA

  • *lwu@bnl.gov
  • †irobinson@bnl.gov
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Phys. Rev. B 108, L020403 – Published 20 July, 2023

DOI: https://doi.org/10.1103/PhysRevB.108.L020403

Abstract

The temperature-dependent behavior of magnetic domains plays an essential role in the magnetic properties of materials, leading to widespread applications. However, experimental methods to access the three-dimensional (3D) magnetic domain structures are very limited, especially for antiferromagnets. Over the past decades, the spin-orbit Mott insulator iridate Sr2IrO4 has attracted particular attention because of its interesting magnetic structure and analogy to superconducting cuprates. Here, we apply resonant x-ray magnetic Bragg coherent diffraction imaging to track the real-space 3D evolution of antiferromagnetic ordering inside a Sr2IrO4 single crystal as a function of temperature, finding that the antiferromagnetic domain shows anisotropic changes. The anisotropy of the domain shape reveals the underlying anisotropy of the antiferromagnetic coupling strength within Sr2IrO4. These results demonstrate the high potential significance of 3D domain imaging in magnetism research.

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Phys. Rev. B 108, L020403– Published 20 July, 2023
  • Received 6 August 2022
  • Accepted 10 July 2023
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