Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 85: Spincaloric Transport II (organized by MA)
TT 85.4: Talk
Thursday, April 3, 2014, 10:15–10:30, HSZ 04
Temporal evolution of the longitudinal spin Seebeck effect — •Vitaliy Vasyuchka1, Milan Agrawal1,2, Alexander Serga1, Akihiro Kirihara1,3, Philipp Pirro1, Thomas Langner1, Frank Heussner1, Benjamin Jungfleisch1, Andrii Chumak1, Evangelos Papaioannou1, and Burkard Hillebrands1 — 1FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz — 3Smart Energy Research Laboratories, NEC Corporation, Tsukuba, Japan
The spin Seebeck effect (SSE) is one of the most fascinating phenomena in the contemporary period of spin caloritronics. Further advancements in industrial applications like temperature gradient sensors and thermal spin-current generators require an in-depth understanding of this effect. We developed an experimental approach where we studied the temporal evolution of the SSE in YIG/Pt bilayer structures in the longitudinal configuration. Our findings reveal that this effect is a sub-microsecond fast phenomenon governed by the temperature gradient and the thermal magnons diffusion in the magnetic material. A comparison of our experimental results with the thermal-driven magnon-diffusion model shows that the temporal behavior of the SSE depends on the time development of the temperature gradient in the vicinity of the YIG/Pt interface. The effective thermal-magnon diffusion length for our YIG/Pt system is estimated to be around 500 nm.
Financial support by the Deutsche Forschungsgemeinschaft (SE 1771/4-1) within Priority Program 1538 "Spin Caloric Transport" is gratefully acknowledged.