Regensburg 2013 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 22: Poster II
DF 22.61: Poster
Freitag, 15. März 2013, 10:30–13:30, Poster D
Spin Seebeck effect in FM/NM/NM hybrid structures — •Michael Schreier1, Kathrin Ganzhorn1, Mathias Weiler1, Matthias Althammer1,2, Sibylle Meyer1, Rudolf Gross1, and Sebastian T.B. Goennenwein1 — 1Walther-Meißner-Institut, Garching, Germany — 2Univeristy of Alabama, Center for Materials for Information Technology MINT, Tuscaloosa, AL, USA
In the spin Seebeck effect thermally excited magnetic moments in a ferromagnet (FM) give rise to a pure spin current which is then detected in a normal metal (NM), usually platinum. Platinum, however, can be subject to a pronounced magnetic proximity effect, which induces a static magnetic polarization adjacent to the interface to the FM. This could eventually give rise to additional contributions by the anomalous Nernst effect in the longitudinal spin Seebeck geometry [1]. Therefore, we have conducted a series of measurements and simulations on YIG/Pt, YIG/Au/Pt, YIG/Cu/Pt, YIG/Au and YIG/Cu samples to verify whether recent spin Seebeck experiments have to be reevaluated on these terms. We find that contributions by the anomalous Nernst effect to the measured voltage signals [2] are much smaller, likely entirely negligible, than those from the spin Seebeck effect. Furthermore, the reported [1] inverse relation between the platinum film thickness and the spin Seebeck voltage can be explained by taking the spin diffusion in the NM into account. This work is supported by the DFG via SPP1538.
[1] S. Y. Huang et al., Phys. Rev. Lett. 109, 107204 (2012)
[2] M. Weiler et al., Phys. Rev. Lett. 108, 106602 (2012)