Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.50: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Dependence of the temporal dynamics of the longitudinal spin Seebeck effect on the magnetic layer thickness in YIG/Pt bilayers — •Timo Noack, Thomas Langner, Frank Heussner, Viktor Lauer, Alexander Serga, Burkard Hillebrands, and Vitaliy Vasyuchka — FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Kaiserslautern, Germany

The longitudinal spin Seebeck effect (LSSE) attracts a rising interest for both fundamental studies and application developments. The spectral properties of the LSSE are not completely understood so far. Our main focus was to investigate the temporal dynamics of the LSSE with focus on the dependence of the transition processes on the thickness of a magnetic film (in our case yttrium-iron-garnet, YIG) (0.27µm-50µm) in YIG/Pt bilayers. To obtain spectral properties of the LSSE a time resolved measurement technique with single pulsed microwave-induced heating, as well as a frequency resolved measurement technique with amplitude modulated heating were utilized. Both experiments show that the temporal dynamics of the LSSE becomes slower with increase of the YIG thickness. Specifically, with decrease of the YIG film thickness single-pulse measurements result in an decrease in the LSSE rise-time, while the frequency modulation method results in an increase of the cut-off frequencies (-3dB of initial LSSE voltage at 1kHz). This behavior evidences the significant contribution of bulk magnon modes to the LSSE. Financial support by the Deutsche Forschungsgemeinschaft within Priority Program 1538 "Spin Caloric Transport" is gratefully acknowledged.