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arXiv · 2308.12500

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

D. Sando·S. Chen·O. Paull·B. Xu·J. J. L. van Rijn·C. Xu·S. Xu·F. Appert·J. Juraszek·L. Bellaiche·V. Nagarajan·T. Banerjee
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Abstract

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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D. Sando, S. Chen, O. Paull, B. Xu, J. J. L. van Rijn, C. Xu, S. Xu, F. Appert, J. Juraszek, L. Bellaiche, V. Nagarajan, T. Banerjee. 2023-08-24. Strain Dependent Spin Hall Magnetoresistance in the Multiferroic Antiferromagnet BiFeO$_3$. https://arxiv.org/abs/2308.12500

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