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MA: Fachverband Magnetismus

MA 3: Spin Hall Effects

MA 3.2: Vortrag

Montag, 31. März 2014, 09:45–10:00, HSZ 403

Temperature dependence of the spin Hall magnetoresistance in YIG / Pt hybrids — •Sibylle Meyer¹, Matthias Althammer¹, Stephan Geprägs¹, Matthias Opel¹, Rudolf Gross^{1, 2}, and Sebastian T. B. Goennenwein¹ — ¹Walther - Meißner - Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — ²Physik - Department, Technische Universität München, 85748 Garching, Germany

The generation and detection of pure spin currents represents a new paradigm for spin electronics. Within the last two years, the spin Hall magnetoresistance (SMR), a novel type of magnetoresistance based on the interplay between spin and charge transport in ferromagnetic insulator/normal metal hybrids, has become a powerful tool to access the spin transport properties of normal metals. Here we study the temperature dependence of the SMR in Y₃Fe₅O₁₂/Pt hybrid structures via magnetization orientation dependent magnetoresistance measurements. Our experiments show that the SMR amplitude decreases with decreasing temperature, which can be modeled in terms of a spin Hall angle in Pt decreasing from 0.11 at room temperature to 0.075 at 10 K, while the spin diffusion length and the spin mixing conductance of the ferrimagnetic insulator/normal metal interface remain almost constant.
Financial support by the Deutsche Forschungsgemeinschaft via SPP 1538 (project no. GO 944/4) and the German Excellence Initiative via the "Nanosystems Initiative Munich (NIM)" is gratefully acknowledged.