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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 Makarov¹ — ¹Helmholtz-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).