Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: POSTER Ib

MA 20.17: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Temperature Dependence of the Spin Seebeck Effect in Iron Garnets — •Francesco Della Coletta^1,2, Andreas Kehlberger³, Tomek Schulz³, Christian Mix³, Sibylle Meyer^1,2, Matthias Althammer¹, Hans Huebl^1,4, Gerhard Jakob³, Stephan Geprägs¹, Rudolf Gross^1,2,4, Sebastian T. B. Goennenwein^1,4, 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.