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PGI-1 Talk: Prof. Dr. Helen Gomonay

Spin Hall magnetoresistance in antiferromagnet/normal metal heterostructures

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25 Jul 2018 12:00
venue
PGI Lecture Hall

Uni Mainz

Abstract:

In my presentation I give a review of the recent studies of the spin Hall magnetoresistance in thin film bilayer heterostructures of the normal metal Pt and the antiferromagnetic insulator NiO. While rotating an external magnetic field in different planes of NiO, the longitudinal and the transverse resistivity of the Pt layer shows an amplitude modulation consistent with the spin Hall magnetoresistance. In comparison to Pt on collinear ferrimagnets, the modulation is phase shifted by 90$^\circ$ 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 multi-domain materials.

Contact

Prof. Dr. Yuriy Mokrousov
Phone: +49 2461 61-4434
email: y.mokrousov@fz-juelich.de