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Anomalous spin Hall angle of a metallic ferromagnet determined by a multiterminal spin injection/detection device

Anomalous spin Hall angle of a metallic ferromagnet determined by a multiterminal spin injection/detection device

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WIMMER, Tobias, Birte COESTER, Stephan GEPRÄGS, Rudolf GROSS, Sebastian T. B. GÖNNENWEIN, Hans HUEBL, Matthias ALTHAMMER, 2019. Anomalous spin Hall angle of a metallic ferromagnet determined by a multiterminal spin injection/detection device. In: Applied Physics Letters. American Institute of Physics (AIP). 115(9), 092404. ISSN 0003-6951. eISSN 1077-3118. Available under: doi: 10.1063/1.5101032

@article{Wimmer2019-05-02T10:55:25ZAnoma-51779, title={Anomalous spin Hall angle of a metallic ferromagnet determined by a multiterminal spin injection/detection device}, year={2019}, doi={10.1063/1.5101032}, number={9}, volume={115}, issn={0003-6951}, journal={Applied Physics Letters}, author={Wimmer, Tobias and Coester, Birte and Geprägs, Stephan and Gross, Rudolf and Gönnenwein, Sebastian T. B. and Huebl, Hans and Althammer, Matthias}, note={Article Number: 092404} }

Geprägs, Stephan Gross, Rudolf 2020-11-13T12:35:43Z Anomalous spin Hall angle of a metallic ferromagnet determined by a multiterminal spin injection/detection device Althammer, Matthias Gönnenwein, Sebastian T. B. Gross, Rudolf Wimmer, Tobias 2020-11-13T12:35:43Z terms-of-use eng Huebl, Hans Althammer, Matthias Gönnenwein, Sebastian T. B. Huebl, Hans We report on the determination of the anomalous spin Hall angle in the ferromagnetic metal alloy cobalt-iron (Co<sub>25</sub>Fe<sub>75</sub>, 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 (Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>, YIG). Applying a spin-resistor model to our multiterminal spin transport data, we determine the magnon conductivity in YIG, the spin conductance at the YIG/CoFe interface, and finally the anomalous spin Hall angle of CoFe as a function of its spin diffusion length in a single device. Our experiments clearly reveal a negative anomalous spin Hall angle of the ferromagnetic metal CoFe, but a vanishing ordinary spin Hall angle. This work, therefore, adds new observations to the results reported in Tian et al. [Phys. Rev. B 94, 020403 (2016)] and Das et al. [Phys. Rev. B 96, 220408(R) (2017)] , where the authors found finite contributions of the ordinary spin Hall angle in the ferromagnetic metals Co and Permalloy. Coester, Birte Geprägs, Stephan 2019-05-02T10:55:25Z Wimmer, Tobias Coester, Birte

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