Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 46: Spin: Transport, Orbitronics and Hall Effects I
MA 46.3: Talk
Thursday, March 19, 2020, 10:00–10:15, HSZ 403
Spin Hall magnetoresistance in heterostructures consisting of noncrystalline paramagnetic YIG and Pt — •Michaela Lammel1, Richard Schlitz2, Kevin Geishendorf1, Denys Makarov3, Tobias Kosub3, Savio Fabretti2, Helena Reichlova2, Rene Huebner3, Kornelius Nielsch1, Andy Thomas1, and Sebastian T.B. Goennenwein2 — 1Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden) — 2Institut für Festkörper- und Materialphysik, Technische Universität Dresden — 3Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research
The spin Hall magnetoresistance (SMR) effect arises from spin-transfer across the interface between a metal with large spin orbit coupling and an (insulating) magnet. While the SMR response of ferrimagnetic and antiferromagnetic insulators has been studied extensively, the SMR of a paramagnetic spin ensemble is not well established. We here experimentally investigate the magnetoresistance of sputtered yttrium iron garnet/platinum thin film heterostructures1. Although we find no evidence for crystalline order or spontaneous magnetization in the yttrium iron garnet layer, we observe a clear magnetoresistive response with a dependence on the magnetic field orientation characteristic for the SMR. We propose two models for the origin of the SMR response in paramagnetic insulator/platinum bilayers and critically compare them to our experimental data.
[1] Lammel et al., Appl. Phys. Lett. 114, 252402 (2019)