Dresden 2014 – scientific programme
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MA: Fachverband Magnetismus
MA 3: Spin Hall Effects
MA 3.7: Talk
Monday, March 31, 2014, 11:00–11:15, HSZ 403
Experimental observation of a large ac-spin Hall effect — •Dahai Wei1, Martin Obstbaum1, Christian Back1, and Georg Woltersdorf1,2 — 1Universität Regensburg, 93053 Regensburg, Germany — 2Martin-Luth-Universität Halle, 06120 Halle, Germany
Spin pumping is the most popular approach to inject pure spin currents into various classes of nonmagnetic materials. The polarization direction of the injected spin currents is time dependent and contains only a very small dc-component [1]. This dc-component has been intensely studied in recent years. However in contrast, the two orders of magnitude larger ac-component has escaped experimental detection so far. Here we show that the large ac-component of the spin currents can be detected very efficiently using the inverse spin Hall effect (ISHE) leading to signals one order of magnitude larger than the conventional dc-ISHE measured on the same device. The spectral shape, angular dependence, power scaling behavior and absolute magnitude of the signals are in line with spin pumping and ISHE theory. Our results demonstrate that FM-NM junctions are very efficient sources of pure spin currents in the GHz frequency range.
[1] H. Jiao and G. E. Bauer, Phys. Rev. Lett., 110, 217602 (2013)