Strain Dependent Spin Hall Magnetoresistance in the Multiferroic Antiferromagnet BiFeO$_3$

B. Xu; C. Xu; D. Sando; F. Appert; J. J. L. van Rijn; J. Juraszek; L. Bellaiche; O. Paull; S. Chen; S. Xu

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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.

Strain Dependent Spin Hall Magnetoresistance in the Multiferroic Antiferromagnet BiFeO₃

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