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Strain-dependent spin Hall magnetoresistance in the multiferroic antiferromagnet BiFeO3

D. Sando1,2,3,*,†, S. Chen4,*, O. Paull2,3, B. Xu5, J. J. L. van Rijn4, C. Xu6, S. Xu5, F. Appert7, J. Juraszek7 et al.

L. Bellaiche3,8, V. Nagarajan2,3, and T. Banerjee3,4,‡

  • 1The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Physical and Chemical Sciences, University of Canterbury, Christchurch 8041, New Zealand
  • 2School of Materials Science and Engineering, UNSW Sydney, Kensington 2052, Australia
  • 3Australian Research Council Centre of Excellence in Future Low Energy Electronics, Kensington 2052, Australia
  • 4University of Groningen, Zernike Institute for Advanced Materials, 9747 AG Groningen, The Netherlands
  • 5Jiangsu Key Laboratory of Frontier Material Physics and Devices, School of Physical Science and Technology, Soochow University, Suzhou 215006, China
  • 6Key Laboratory of Computational Physical Sciences (Ministry of Education), Institute of Computational Physical Sciences, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China and Shanghai Qi Zhi Institute, Shanghai 200030, China
  • 7Université Rouen Normandie, INSA Rouen Normandie, CNRS, Normandie Université, GPM UMR 6634, F-76000 Rouen, France
  • 8Smart Ferroic Materials Center, Department of Physics and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, Arkansas 72701, USA and Department of Materials Science and Engineering, Tel Aviv University, Ramat Aviv, Tel Aviv 6997801, Israel

  • *These authors contributed equally to this work.
  • †Contact author: daniel.sando@canterbury.ac.nz
  • ‡Contact author: t.banerjee@rug.nl

Phys. Rev. Materials 8, L071401 – Published 12 July, 2024

DOI: https://doi.org/10.1103/PhysRevMaterials.8.L071401

Abstract

The spin Hall magnetoresistance (SMR) of antiferromagnetic BiFeO3 thin film surfaces is investigated. SMR consistent with weak ferromagnetic order in films fabricated on (001) SrTiO3 (R′ BFO) and LaAlO3 (T′ BFO) substrates is found, albeit with different temperature dependencies. For T′ BFO, the SMR is enhanced at room temperature, and decays with reduced temperatures. By contrast, R′ BFO shows a monotonic decrease in SMR response with increasing temperature, mirroring the trend of a weak ferromagnet. Density functional theory shows that this intriguing difference originates due to the different octahedral rotation patterns in R′ and T′ BFO and their coupling to the applied magnetic field and spin degrees of freedom.

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