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MA: Fachverband Magnetismus
MA 44: Spininjection / Spin currents in heterostructures
MA 44.11: Talk
Thursday, March 10, 2016, 17:45–18:00, H31
Investigation of the unidirectional spin heat conveyer effect in a 200nm thin Yttrium Iron Garnet film — •Olga Wid1, Jan Bauer2, Otwin Breitenstein2, and Georg Schmidt1,3 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Germany — 2Max Planck Institute of Microstructure Physics, Halle (Saale), Germany — 3Interdisziplinäres Zentrum für Materialwissenschaften, MLU Halle-Wittenberg, Germany
In 2013 An et al. have shown that nonreciprocal spin waves, so-called Damon-Eshbach modes, can be used to transport heat. The direction of the heat flow is independent from thermal gradients and can be switched by reversing the applied magnetic field [1]. The measurements reported so far were performed with an infrared camera on YIG films with thicknesses of few micrometers to hundreds of micrometers. We are able to demonstrate the unidirectional spin heat conveyer effect even on a 200nm thin YIG film, using Lock-in thermography [2]. In our measurements we can discern temperature differences smaller than 1 mK. These results are important for measurement of the inverse spin-hall effect (ISHE) and spin caloritronics, showing that small temperature differences can be created even in thin layers when Damon-Eshbach modes are involved. These can easily lead to thermovoltages with exactly the same signature as the ISHE voltage which also reverses sign with the magnetic field [3]. [1] T. An et al., Nat Mater 12, 549 (2013) [2] O. Breitenstein, M. Langenkamp, "Lock-in Thermography: Basics and Use for Functional Diagnostics of Electronic Components", Springer (2003) [3] Z. Qiu, AIP Advances 5, 057167 (2015)