Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.17: Poster
Tuesday, March 17, 2015, 09:30–13:00, Poster A
Temperature Dependence of the Spin Seebeck Effect in Iron Garnets — •Francesco Della Coletta1,2, Andreas Kehlberger3, Tomek Schulz3, Christian Mix3, Sibylle Meyer1,2, Matthias Althammer1, Hans Huebl1,4, Gerhard Jakob3, Stephan Geprägs1, Rudolf Gross1,2,4, Sebastian T. B. Goennenwein1,4, and Mathias Kläui3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik-Department, TU München, 85748 Garching, Germany — 3Institute of Physics, University of Mainz, 55099 Mainz, Germany — 4Nanosystems Initiative Munich, 80799 München, Germany
In spin Seebeck effect (SSE) experiments, pure spin currents are driven across a magnetic insulator/normal metal interface by thermal gradients, and detected via the inverse spin Hall effect. Upon using ferrimagnetic insulators, e.g. iron garnets A3Fe5O12 (AIG), comprising different magnetic sublattices in SSE experiments, the question arises whether the spin current properties simply are connected to the net magnetization, or whether the different magnetic sublattices contribute in a more subtle way. We have measured the temperature dependence of the SSE signal in AIG/Pt bilayers with A=Gd,Dy, and find two consecutive sign changes. The first sign change occurs near the magnetic compensation temperature, where the net magnetization of the three sub-lattices is zero. The second sign change shows that the SSE signal results from a complex interplay of the three magnetic sublattices involved. — This work is supported by the DFG via SPP 1538.