Regensburg 2007 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Spin-Dynamics/Switching I
MA 19.14: Talk
Wednesday, March 28, 2007, 18:30–18:45, H23
Effect of parametric pumping on phase profiles of dipolar spin waves in YIG film — •Natalia Sergeeva1,2, Timo Neumann1, Thomas Schneider1, Alexander Serga1, and Burkard Hillebrands1 — 1Fachbereich Physik, TU Kaiserslautern, Kaiserslautern, Germany — 2St. Petersburg Electrotechnical University, St. Petersburg, Russia
The phase profile of a spin wave (SW) packet propagating through the area of parametric pumping in a longitudinally magnetized yttrium-iron-garnet (YIG) film waveguide was studied. The magnetic media was influenced by spatially localized microwave parallel pumping of double frequency. The phase profile of the SW packet was measured by means of phase-sensitive time- and space-resolved Brillouin light scattering spectroscopy as well as by conventional microwave technique. The influence of pumping power, pumping duration and moment of application of pumping on the phase profiles was investigated. It was observed that a nonlinear phase accumulation process significantly distorts the initially flat phase profile of the SW packet. The mentioned effect is caused by the magnetic barrier formed by exchange dominated magnons, which were parametrically excited from the thermal level in the pumping area.
Financial support by the DFG (Graduiertenkolleg 792 and Grant No. Hi 380/13) and DAAD (Grant 6205-A0556601) is gratefully acknowledged.