Spin structure and spin Hall magnetoresistance of epitaxial thin films of the insulating non-collinear antiferromagnet SmFeO${}_3$

Abstract

We report a combined study of imaging the antiferromagnetic (AFM) spin structure and measuring the spin Hall magnetoresistance (SMR) in epitaxial thin films of the insulating non-collinear antiferromagnet SmFeO${}_3$. X-ray magnetic linear dichroism photoemission electron microscopy measurements reveal that the AFM spins of the SmFeO${}_3$(110) align in the plane of the film. Angularly dependent magnetoresistance measurements show that SmFeO${}_3$/Ta bilayers exhibit a positive SMR, in contrast to the negative SMR expected in previously studied collinear AFMs. The SMR amplitude increases linearly with increasing external magnetic field at higher magnetic field, suggesting that field-induced canting of the AFM spins plays an important role. In contrast, around the coercive field, no detectable SMR signal is observed, indicating that SMR of AFM and canting magnetization components cancel out. Below 50~K, the SMR amplitude increases sizably by a factor of two as compared to room temperature, which likely correlates with the long-range ordering of the Sm ions. Our results show that the SMR is a sensitive technique for non-equilibrium spin system of non-collinear AFM systems.

arXiv commentAccepted for publication in Journal of Physics: Condensed Matter. This is the version of the article before peer review or editing, as submitted by an author to Journal of Physics: Condensed Matter. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it

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• Structural sensitivity of the spin Hall magnetoresistance in antiferromagnetic thin films
• Sign reversal of anomalous Hall conductivity and magnetoresistance in cubic non-collinear antiferromagnet Mn${}_3$Pt thin films
• Magnetic order of Dy${}^{3+}$ and Fe${}^{3+}$ moments in antiferromagnetic DyFeO${}_3$ probed by spin Hall magnetoresistance and spin Seebeck effect
• Role of substrate clamping on anisotropy and domain structure in the canted antiferromagnet $\alpha$-Fe${}_2$O${}_3$
• An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit
• Effective strain manipulation of the antiferromagnetic state of polycrystalline NiO
• Electrical detection of the spin reorientation transition in antiferromagnetic TmFeO${}_3$ thin films by spin Hall magnetoresistance
• Insight into the structural and magnetotransport properties of epitaxial heterostructures $\alpha$-Fe${}_2$O${}_3$-Pt(111): Role of the reversed layer sequence
• Probing magnetic anisotropy and spin-reorientation transition in 3D antiferromagnet, Ho${}_{0.5}$Dy${}_{0.5}$FeO${}_3|$Pt using spin Hall magnetoresistance