Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 30: Focus Session "Spin Currents in Magnetic Nanostructures", Organization: Mathias Kläui (Univ. Mainz)
MA 30.2: Topical Talk
Mittwoch, 28. März 2012, 15:30–16:00, EB 301
Spin pumping with photons and phonons — •Mathias Weiler1, Franz D. Czeschka1, Hans Huebl1, Frederik S. Goerg1, Matthias Althammer1, Lukas Dreher2, Martin S. Brandt2, Rudolf Gross1, and Sebastian T. B. Goennenwein1 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Walter Schottky Institut, Technische Universität München, Garching, Germany
Spin pumping and the inverse spin Hall effect are key phenomena to generate and detect pure spin currents. In a systematic study of the photon-driven spin pumping effect in a series of ferromagnet/normal metal hybrids, we found that the inverse spin Hall voltage VDC scales with the magnetization precession cone angle, irrespective of the particular properties of the ferromagnet [1]. In a complimentary approach, we show that spin pumping can also be driven by exploiting the purely virtual magnetic driving field caused by coherent phonons in magnetoelastic media [2]. To this end, we excite a Co/Pt thin film bilayer by radio frequency surface acoustic wave pulses and measure VDC. In our time-resolved experiments, we can disentangle photon- and phonon-driven contributions to VDC and find evidence for resonant spin current generation in the exclusive presence of an elastic excitation.
This demonstrates that spin pumping in ferromagnet/normal metal hybrids is a generic phenomenon that can be consistently modeled irrespective of magnetic material and excitation mechanism.
[1] F. D. Czeschka et al. Phys. Rev Lett. 107, 046601 (2011)
[2] M. Weiler et al. (2011) arXiv:1110.1187