Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Spindynamics / Switching III
MA 33.7: Vortrag
Freitag, 30. März 2007, 12:30–12:45, H23
Linear and nonlinear phase accumulation of dipolar spin waves propagating in yttrium-iron-garnet films — •Thomas Schneider1, Alexander A. Serga1, Burkard Hillebrands1, and Mikhail P. Kostylev2 — 1Fachbereich Physik, TU Kaiserslautern, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern, Germany — 2School of Physics, M013, University of Western Australia, 35 Stirling Highway, Crawle, WA 6009, Australia
We report on phase resolved investigations of dipolar spin waves propagating in Yttrium-Iron-Garnet spin-wave waveguides. Microwave excited spin-wave packets with different intensities have been observed using space, time and phase resolved Brillouin light scattering spectroscopy. The phase sensitivity of our system allows the measurement of the phase profiles (i.e., the time dependent phase difference between the exciting microwave signal and the spin wave at any given point) and thus the phase accumulation over the complete propagation range. Changing the power of the input microwave signal gives the possibility to excite either linear or nonlinear spin-wave pulses. In the latter case we were able to investigate the influence of the spin-wave amplitude on the spin-wave phase. Nonlinear phase splitting between the peak and the tail of nonlinear spin-wave pulses was observed. An interpretation of this effect is presented.
Financial support by the DFG (Graduiertenkolleg 792 and Grant No. Hi 380/13) and the Australian Research Council is gratefully acknowledged.