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HL: Fachverband Halbleiterphysik

HL 32: Spintronics and magnetic semiconductors (MA, jointly with HL)

HL 32.5: Vortrag

Dienstag, 12. März 2013, 10:30–10:45, H3

Optimization of spin pumping in YIG/Pt structures — •Matthias Benjamin Jungfleisch, Viktor Lauer, Roland Neb, Andrii V. Chumak, and Burkard Hillebrands — Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany

Spin pumping in yttrium iron garnet (YIG)/platinum (Pt) structures is an interface effect and, thus, it is of crucial importance to investigate the influence of surface processing of the ferromagnetic YIG layer before the Pt deposition.

Here, we present for the first time, systematic studies on the YIG/Pt interface, which improve the spin pumping efficiency. The spin currents generated by spin pumping in the Pt layer are detected by the inverse spin Hall effect (ISHE). Three sets of YIG/Pt samples with different YIG thicknesses and constant Pt thickness of 10 nm were investigated. Spin pumping was driven by the ferromagnetic resonance excited by an external microwave signal. We measure the FMR spectra using a conventional microwave technique, as well as the ISHE induced voltage, allowing us to calculate the spin pumping efficiency defined as the ratio of the detected ISHE charge current to the absorbed microwave power. We succeeded in improving the spin pumping efficiency by a factor of more than 150.

Financial support by the Deutsche Forschungsgemeinschaft CH 1037/1-1 is gratefully acknowledged.