Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 50: Poster II
MA 50.80: Poster
Freitag, 15. März 2013, 10:30–13:30, Poster D
Heat-induced damping manipulation in YIG/Pt hetero-structures — •Matthias Benjamin Jungfleisch1, Toshu An2, Kazuya Ando2, Yosuke Kajiwara2, Ken-ichi Uchida2, Vitaliy I. Vasyuchka1, Andrii V. Chumak1, Alexander A. Serga1, Eiji Saitoh2, and Burkard Hillebrands1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany — 2Institute for Material Research, Tohoku University, Sendai 980-8577, Japan.
One of the main objectives in the field of magnon spintronics is the control and manipulation of magnetization relaxation and the generation of spin waves.
Here, we show the manipulation of spin-wave damping utilizing a temperature difference across the thickness of an yttrium iron garnet (YIG)/platinum (Pt) multi-structure. This temperature difference Δ T gives rise to the longitudinal spin Seebeck effect: an imbalance between the effective magnon and the effective electron temperatures causes a spin current across the YIG/Pt interface. Since the created spin current transfers spin angular momentum, a torque is exerted on the magnetization. Consequently, the magnetization precession is either enhanced or suppressed depending on the sign of Δ T. This damping variation can be expressed as a change of the ferromagnetic resonance linewidth Δ HFMR that is measured by spin pumping in the adjacent Pt layer as well as by microwave reflection.
Financial support by the Deutsche Forschungsgemeinschaft within the projects SE 1771/4-1 and CH 1037/1-1 is gratefully acknowledged.