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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.80: Poster
Freitag, 26. März 2010, 11:00–14:00, Poster B1
Optical detection of magnetoelastic interaction in a magnetic film — •Christian W. Sandweg, Benjamin Jungfleisch, Vitaliy I. Vasyuchka, Björn Obry, Helmut Schultheiss, Alexander A. Serga, and Burkard Hillebrands — FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany
The technique of parametric microwave pumping plays an important role for transferring energy to magnon systems. In the case of longitudinal pumping, when the microwave magnetic field is parallel to the bias magnetic field, a microwave photon splits into two magnons with half of the pumping frequency and opposite wave-vector. The exact spectral definition of the magnon groups created hereby is crucial for the deeper understanding of the energy transfer into a magnon gas and further applications. Here we report on the wave-vector sensitive detection of the magnons at half of the pumping frequency by means of Brillouin light scattering spectroscopy. We measured the wave number of these magnons from 0 to 1.75 · 105 cm−1 in a range of the bias magnetic field from 1560 to 1680 Oe. We present the experimental evidence of hybridization of parametrically pumped magnons with acoustic waves in Yttrium-Iron-Garnet films used in our experiment.