Dresden 2011 – scientific programme

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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.