Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Spin Dynamics and Transport: Spin Excitations and Spin Torque Phenomena
MA 48.4: Vortrag
Donnerstag, 23. März 2017, 10:15–10:30, HSZ 101
Auto-oscillations in YIG/Pt nanostructures driven by the spin Seebeck effect — •Viktor Lauer1, Micheal Schneider1, Thomas Meyer1, Philipp Pirro1, Frank Heussner1, Carsten Dubs2, Bert Lägel1, Vitaliy I. Vasyuchka1, Alexander A. Serga1, Burkard Hillebrands1, and Andrii V. Chumak1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2INNOVENT e.V., Technologieentwicklung, Prüssingstraße 27B, 07745 Jena, Germany
We report on experimental investigations of magnetization auto-oscillations excitated in the YIG layer of a YIG/Pt nanowire driven by the spin Seebeck effect (SSE). DC current pulses applied to the nanowire result in Joule heating of the Pt layer, and lead to the formation of a thermal gradient across the YIG/Pt interface. The thermal gradient gives rise to a SSE-induced spin current injected into the YIG layer which exerts an anti-damping torque on the magnetization, and, eventually, excites magnetization precession. Time-resolved Brillouin light scattering microscopy is used to investigate the temporal evolution and spatial distribution of the excited magnetization dynamics in the nanowire. These findings are of interest since they suggest the generation of a coherent precession state from incoherent SSE-injected magnons and reveal a realization of microwave sources at room temperature. This research has been supported by: EU-FET Grant InSpin 612759, ERC Starting Grant 678309 MagnonCircuit, and DFG (DU 1427/2-1, and SE 1771/4-2 within SPP 1538)