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MA: Fachverband Magnetismus
MA 54: Spin Excitations I
MA 54.6: Talk
Thursday, March 17, 2011, 16:15–16:30, HSZ 04
Scaling behavior of the spin pumping effect in conductive ferromagnet/platinum bilayers — Franz D. Czeschka1, Lukas Dreher2, Martin S. Brandt2, Matthias Althammer1, Inga-Mareen Imort3, Günter Reiss3, Andy Thomas3, Wladimir Schoch4, Wolfgang Limmer4, Hans Huebl1, Rudolf Gross1, and •Sebastian T.B. Goennenwein1 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Walter Schottky Institut, Technische Universität München, Garching, Germany — 3Fakultät für Physik, Universität Bielefeld, Germany — 4Abteilung Halbleiterphysik, Universität Ulm, Germany
Spin pumping experiments allow to measure spin currents or the spin Hall angle. We have systematically studied the spin pumping DC voltage occurring in conjunction with ferromagnetic resonance in a series of conductive ferromagnet/platinum bilayers, made from elemental 3d transition metals, Heusler compounds, ferrite spinel oxides, and magnetic semiconductors. In all bilayers, we invariably observe the same DC voltage polarity. Moreover, we find that the voltage magnitude scales with the magnetization precession cone angle with a universal prefactor, irrespective of the magnetic properties, the charge carrier transport mechanism, and the charge carrier type in a given ferromagnet. These findings quantitatively corroborate the present theoretical understanding of spin pumping in combination with the inverse spin Hall effect, and establish spin pumping as a generic phenomenon.
Financial support by the Excellence Cluster Nanosystems Initiative Munich (NIM) and the NRW MIWF is gratefully acknowledged.