6533b85efe1ef96bd12c0953
RESEARCH PRODUCT
Spin Hall magnetoresistance in antiferromagnet/heavy-metal heterostructures
Hans HueblHans HueblMatthias OpelKathrin GanzhornOlena GomonayRichard SchlitzJohanna FischerMatthias AlthammerStephan GeprägsN. VlietstraRudolf GrossRudolf GrossSebastian T. B. Goennenweinsubject
PhysicsCondensed Matter - Materials ScienceMagnetoresistanceSpintronicsCondensed matter physicsSpin polarizationCondensed Matter - Mesoscale and Nanoscale PhysicsMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciences02 engineering and technologyQuantum Hall effect021001 nanoscience & nanotechnologyCondensed Matter::Mesoscopic Systems and Quantum Hall Effect01 natural sciencesSpin magnetic momentCondensed Matter::Materials ScienceQuantum spin Hall effectMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesSpin Hall effectAntiferromagnetismCondensed Matter::Strongly Correlated Electrons010306 general physics0210 nano-technologydescription
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 ${90}^{\ensuremath{\circ}}$ 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.
year | journal | country | edition | language |
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2017-09-13 |