Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 67: Poster 4

MA 67.26: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG3

Spectral properties of the longitudinal spin Seebeck effect — •Timo Noack, Thomas Langner, Frank Heussner, Viktor Lauer, Oleksandr Serha, Burkard Hillebrands, and Vitaliy Vasyuchka — Fachbereich Physik der TU Kaiserslautern und Landesforschungszentrum OPTIMAS, 67663 Kaiserslautern, Germany

The transitional dynamics of the longitudinal spin Seebeck effect (LSSE) was investigated in YIG/Pt bilayers. Two experimental approaches were used to measure LSSE in a wide range of YIG thicknesses. Firstly, a pulsed microwave signal was applied to the structure and the subsequent thermal gradient gives rise to a LSSE-voltage pulse, which was measured by an oscilloscope. Over the thickness range from 270 nm to 53 µm we observed an increase of the rise-time by a factor of 42. Secondly, the heating microwave signal was modulated by a low-frequency signal and the LSSE-voltage was measured for different modulation frequencies. The cut-off frequency was extracted from the LSSE transfer function. It shows an inverse proportional dependence to the magnetic layer thickness. Both experiments can be understood by considering the transfer properties of the magnons in their diffusive process. Financial support by the Deutsche Forschungsgemeinschaft within SPP 1538 "Spin Caloric Transport" is gratefully acknowledged.