Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 4: Topological insulators and spin-dependent transport phenomena

MA 4.7: Vortrag

Montag, 1. April 2019, 11:00–11:15, H52

Spin Hall magnetoresistance in metals on antiferromagnetic α-Cr2O3 — •Tobias Kosub1, Asser Elsayed1, Richard Schlitz2, Jürgen Fassbender1, Sebastian Gönnenwein2, and Denys Makarov11Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany — 2TU Dresden, Dresden, Germany

Spin Hall magnetoresistance (SMR) is a crucial phenomenon for insulator spintronics as it enables regular metals to be used to drive and sense magnetic effects in the insulators. While the effect has been thoroughly studied for ferrimagnetic insulators [1], antiferromagnetic [2] and paramagnetic insulators are interesting materials for future spintronics applications.

We present a thorough study of both longitudinal and transverse magnetotransport signatures of the spin Hall magnetoresistance, for various metals on Cr2O3. We monitor the system above and beyond the Nèel temperature - in the antiferromagnetic and paramagnetic phases. The magnetotransport effects are generally larger in the paramagnetic phase, highlighting the potential importance of paramagnets for spintronic applications.

Several inconsistencies with established SMR theory are reported and we offer different explanations taking into account the paramagnetic nature of the material.

[1] H. Nakayama et al., Phys. Phys. Lett. 110, 206601 (2013)

[2] R. Schlitz et al., Appl. Phys. Lett. 112, 132401 (2018).

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