Spin pumping in YIG/Pt bilayers as a function of layer thickness
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We systematically investigate the spin-pumping effect in a series of yttrium-iron-garnet (YIG)–platinum (Pt) bilayers, comparing both broadband ferromagnetic resonance and electrically detected spin-pumping experiments. We infer the effective spin-mixing conductance as a function of YIG and Pt layer thickness from ferromagnetic resonance measurements on pure YIG layers as well as on bilayer YIG/Pt samples in a frequency range from 2 to 20 GHz. In bare YIG films, we determine a Gilbert damping constant of approximately α=0.001. With an additional platinum layer on top of the YIG samples, the damping is significantly enhanced. The effective spin-mixing conductance extracted from the ferromagnetic resonance experiments is in agreement with that determined from independent electrically detected spin-pumping experiments.
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HAERTINGER, Markus, Christian H. BACK, Johannes LOTZE, Mathias WEILER, Stephan GEPRÄGS, Hans HUEBL, Sebastian T. B. GÖNNENWEIN, Georg WOLTERSDORF, 2015. Spin pumping in YIG/Pt bilayers as a function of layer thickness. In: Physical Review B. American Physical Society (APS). 2015, 92(5), 054437. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.92.054437BibTex
@article{Haertinger2015pumpi-52429, year={2015}, doi={10.1103/PhysRevB.92.054437}, title={Spin pumping in YIG/Pt bilayers as a function of layer thickness}, number={5}, volume={92}, issn={2469-9950}, journal={Physical Review B}, author={Haertinger, Markus and Back, Christian H. and Lotze, Johannes and Weiler, Mathias and Geprägs, Stephan and Huebl, Hans and Gönnenwein, Sebastian T. B. and Woltersdorf, Georg}, note={Article Number: 054437} }
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