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arxiv: 2308.12500 · v1 · pith:CWGSVVIA · submitted 2023-08-24 · cond-mat.mtrl-sci · cond-mat.mes-hall

Strain Dependent Spin Hall Magnetoresistance in the Multiferroic Antiferromagnet BiFeO₃

D. Sando , S. Chen , O. Paull , B. Xu , J. J. L. van Rijn , C. Xu , S. Xu , F. Appert
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J. Juraszek L. Bellaiche V. Nagarajan T. Banerjee
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classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords bifeospintemperaturefilmshallmagnetoresistancealbeitantiferromagnet
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The spin Hall magnetoresistance (SMR) of epitaxial BiFeO$_3$ thin films is investigated. SMR consistent with ferromagnetic interfacial states for BiFeO$_3$ films fabricated on (001) SrTiO$_3$ (R' BFO) and LaAlO$_3$ (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 difference originates from the coupling of the applied magnetic field to oxygen octahedral rotation (R') and spin (T') degrees of freedom.

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