Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 46: Spin: Transport, Orbitronics and Hall Effects I

MA 46.8: Talk

Thursday, March 19, 2020, 11:30–11:45, HSZ 403

Anomalous spin Hall angle in a metallic ferromagnet determined by a multiterminal spin injection/detection device — •T. Wimmer^1,2, B. Coester¹, S. Geprägs¹, R. Gross^1,2,3,4, S. T. B. Goennenwein⁵, H. Huebl^1,2,3,4, and M. Althammer^1,2 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — ²Physik-Department, Technische Universität München, Garching, Germany — ³Nanosystems Initiative Munich (NIM), München, Germany — ⁴Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, D-80799 München — ⁵Institut für Festkörper- und Materialphysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01062 Dresden, Germany

The spin Hall effect and its characterizing parameter, the spin Hall angle, is crucial for spin to charge conversion processes in spintronics applications. Here, we report on the determination of the anomalous spin Hall angle in the ferromagnetic metal alloy cobalt-iron (Co₂₅Fe₇₅, CoFe). This is accomplished by measuring the spin injection/detection efficiency in a multiterminal device with nanowires of platinum (Pt) and CoFe deposited onto the magnetic insulator yttrium iron garnet (Y₃Fe₅O₁₂, YIG). Applying a spin-resistor model to our spin transport data, we determine the transport properties of YIG and the anomalous spin Hall angle of CoFe as a function of its spin diffusion length in a single device. Our experiments reveal a negative anomalous spin Hall angle of the ferromagnetic metal CoFe, but a vanishing ordinary spin Hall angle. Financial support by the DFG is gratefully acknowledged.