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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 85: Spincaloric Transport II (organized by MA)

TT 85.2: Talk

Thursday, April 3, 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 Kläui11University 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)

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