Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 58: Spintronics II (jointly with TT, HL)
MA 58.3: Talk
Thursday, March 17, 2011, 17:45–18:00, HSZ 401
Temporal evolution of spin pumping from a magnetic insulator detected via the inverse spin Hall effect — •Matthias Benjamin Jungfleisch1, Andrii V. Chumak1, Vitaliy I. Vasyuchka1, Alexander A. Serga1, Peter A. Beck1, Eiji Saitoh2, and Burkard Hillebrands1 — 1Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
The spin pumping effect, which is the conversion of a magnetization precession into a pure spin current, and the inverse spin Hall effect (iSHE), which is the conversion of a spin current into a charge current, have recently been observed in a Platinum (Pt) / Yttrium Iron Garnet (YIG) structure [Y. Kajiwara, et al., Nature 464, 262 (2010)]. Up to now the temporal properties of this combined effect is not known. We used the spin pumping effect to inject a spin current pulse from the magnetic insulator YIG into a thin non-magnetic Pt layer and investigated simultaneously the temporal evolution of both, the iSHE voltage using a wide-band oscilloscope and the intensity of the spin waves by means of time resolved Brillouin light scattering spectroscopy. It is revealed that the iSHE voltage evolves slowler in time than the causing spin-wave mode. This is due to the fact, that secondary spin waves created by two-magnon scattering of the externally excited spin-wave mode make a strong contribution to the iSHE signal. The contributions of the externally excited coherent precession and the non-coherent spin waves have been clearly distinguished in our experiment.