Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.25: Poster

Tuesday, March 12, 2013, 10:30–13:30, Poster D

Ac spin Hall effect in FMR spin pumping — •Dahai Wei, Martin Obstbaum, Markus Härtinger, Georg Woltersdorf, and Christian Back — Institut für Experimentelle und Angewandte Physik, Universität Regensburg,Regensburg, Germany

The spin Hall effect (SHE), which converts charge current into or from a spin current, has been intensively studied in order to understand its basic mechanism. Furthermore, different materials are investigated in the search for larger spin Hall angles needed for more efficient spin-charge conversions on the basis of dc spin and charge currents. In addition to searching for materials with larger SH angles, ac spin currents, which can be two orders of magnitude larger than the dc ones in spin pumping, may be very promising [1].

We studied both the ac and the dc SHE of Pt/Py bilayers by the ferromagnetic resonance (FMR) based spin pumping technique. The spin currents pumped into the Pt layer have both dc, and a much larger ac component which has not been measured up to now. The ac voltages generated by the ac spin Hall effect was directly picked up at the same frequency of the spin pumping.

[1]Hujun Jiao & Gerrit E. W. Bauer, AC Voltage Generation by Spin Pumping and Inverse Spin Hall Effect. arXiv:1210.0724.