Journal
PHYSICAL REVIEW B
Volume 97, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.014417
Keywords
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Funding
- Deutsche Forschungsgemeinschaft [SPP 1538, GO 944/4, GR 1132/18]
- German Excellence Initiative via the Nanosystems Initiative Munich (NIM)
- Technical University of Munich
- Alexander von Humbolt Foundation
- ERC Synergy Grant SC2 [610115]
- Transregional Collaborative Research Center [(SFB/TRR) 173 SPIN+X]
- EUFET Open RIA Grant [766566]
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We investigate the spin Hall magnetoresistance in thin-film bilayer heterostructures of the heavy metal Pt and the antiferromagnetic insulator NiO. While rotating an external magnetic field in the easy plane of NiO, we record the longitudinal and the transverse resistivity of the Pt layer and observe an amplitude modulation consistent with the spin Hall magnetoresistance. In comparison to Pt on collinear ferrimagnets, the modulation is phase shifted by 90. and its amplitude strongly increases with the magnitude of the magnetic field. We explain the observed magnetic field dependence of the spin Hall magnetoresistance in a comprehensive model taking into account magnetic-field-induced modifications of the domain structure in antiferromagnets. With this generic model, we are further able to estimate the strength of the magnetoelastic coupling in antiferromagnets. Our detailed study shows that the spin Hall magnetoresistance is a versatile tool to investigate the magnetic spin structure as well as magnetoelastic effects, even in antiferromagnetic multidomain materials.
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