Regensburg 2013 – scientific programme
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MA: Fachverband Magnetismus
MA 50: Poster II
MA 50.79: Poster
Friday, March 15, 2013, 10:30–13:30, Poster D
Magnon temperature measurement: new insights into spin Seebeck effect — •Milan Agrawal1, Vitaliy I. Vasyuchka1, Alexander A. Serga1, Alexy D. Karenowska2, Gennadiy A. Melkov3, and Burkard Hillebrands1 — 1Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, 67663, Germany — 2Department of Physics, University of Oxford, Oxford OX1 3PU, UK — 3Faculty of Radiophysics, Taras Shevchenko National University of Kyiv, 03127 Kyiv, Ukraine
The study of magnon-phonon interaction is very important for the advancement of the emerging field of spin caloritronics [1]. The distribution of magnon and phonon temperatures in ferromagnets can explain the thermal spin-transport phenomena which have been observed electrically by measuring the induced inverse spin Hall voltage in normal metal placed over the ferromagnet [2-3]. Here, we report on the measurement of spatial distribution of magnon temperature in magnetic system imposed to a lateral thermal gradient by studying the variation of local magnetization. Our measurements reveal a strong correlation between magnons and phonons, and state that the contribution of magnons to the spin Seebeck effect in magnetic insulators is negligible or rather small. Furthermore, typical length scale of phonon-magnon interaction is calculated. Our results give new insights into the magnon contribution to the spin Seebeck effect.
[1] Bauer, G. E. W. & et al. Nature Mater. 11, 391-399 (2012)
[2] Xiao, J. & et al. Phys. Rev. B 81, 214418 (2010)
[3] Uchida, K. & et al. Nature Mater. 9, 894-897 (2010)