Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 85: Spincaloric Transport II (organized by MA)
TT 85.2: Vortrag
Donnerstag, 3. April 2014, 09:45–10:00, HSZ 04
Thin film studies of the spin Seebeck effect in insulating ferrimagnets — •Andreas Kehlberger1, Gerhard Jakob1, Ulrike Ritzmann2, Denise Hinzke2, Ulrich Nowak2, Mehmet Onbasil3, Dong Hun Kim3, Caroline A. Ross3, Matthias Benjamin Jungfleisch4, Burkard Hillebrands4, and Mathias Kläui1 — 1University of Mainz, D-55099 Mainz — 2University of Konstanz, D-78457 Konstanz — 3Massachusetts Institute of Technology, USA MA-02139 — 4Technische Universität Kaiserslautern, D-67663 Kaiserslautern
One of the most basic and still unresolved questions is the origin of the spin-Seebeck effect (SSE) in magnetic insulators. Recent studies focused on the investigation of the dependence of the SSE on material parameters in bulk material [1], while for applications thin films are more appropriated. We study the longitudinal SSE (LSSE) in thin film garnets grown by PLD, which allows us to probe the dependence of the SSE on magnetic material parameters as well as on the thickness of the ferromagnetic material, revealing a relevant length scale for the LSSE in the order of 100 nm in YIG. A comparison with the magneto-resistance allows us to estimate its contributions and to identify the genuine origin of the SSE in the bulk of the YIG [2]. Beyond YIG, we study other garnets at variable temperatures to determine the SSE dependence on the dominating sub-lattice that governs the effective magnetic moment in a ferrimagnet [3]. [1] K. Uchida et al., Phys. Rev. B 87, 104412 (2013) [2] A. Kehlberger et al., arXiv:1306.0784 (2013) [3] Y. Ohnuma et al., Phys. Rev. B 87, 014423 (2013)