Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Spin Hall Effects
MA 3.1: Vortrag
Montag, 31. März 2014, 09:30–09:45, HSZ 403
YIG thickness dependence of spin pumping in YIG/Pt heterostructures — •Viktor Lauer1, Matthias Benjamin Jungfleisch1, Andrii Chumak1, Andreas Kehlberger2, Dong Hun Kim3, Mehmet Cengiz Onbasli3, Caroline Ross3, Mathias Kläui2, and Burkard Hillebrands1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany — 3Department of Materials Science and Engineering, MIT, Cambridge, MA 02139, USA
The transport and processing of spin information via magnons, as well as their generation and detection are at the heart of magnon spintronics. A very convenient method to detect magnon currents electrically is the combination of spin pumping and the inverse spin Hall effect (ISHE). In our studies the YIG thickness dependence of the spin-pumping effect in YIG/Pt structures was investigated in the nanometer range (20−300 nm YIG films), which is shorter then the exchange correlation length. The observed increase of the ISHE-voltage with increasing film thickness is compared to the theoretically expected behavior. The effective damping parameter of the YIG/Pt samples is found to be enhanced with decreasing film thickness. The investigated samples exhibit a spin mixing conductance of g = (7.43 ± 0.36)×1018 m−2 and a spin Hall angle of θISHE = 0.009 ± 0.001.
Support by the DFG within the project CH 1037/1-1 is gratefully acknowledged.