Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 26: Spin Dynamics / Spin -Torque II

MA 26.4: Talk

Thursday, February 28, 2008, 15:15–15:30, EB 301

Wave-vector Resolved Brillouin Light Scattering Observation of Parametrically Generated Excitations in a Magnon Gas — •Timo Neumann, Aleksandr Serga, and Burkard Hillebrands — Fachbereich Physik, TU Kaiserslautern, Kaiserslautern, Germany

The parametric pumping technique is a very powerful tool to selectively control the density of a magnon gas.

Here we report on the identification of the wave vectors of parametrically generated magnons in a ferrite film.

Using Brillouin Light Scattering (BLS) spectroscopy with wave vector resolution we have studied the process of parametric interaction between an electromagnetic field and the spin wave subsystem of an yttrium iron garnet film in order to unambiguously identify the spectral positions of the generated groups of magnons. Moreover, the process of energy transfer from the overheated areas was investigated.

To achieve this, the possibility to retrieve information about the wave vectors was implemented in an existing BLS-setup by means of spatial selection of the scattered light. Advantages and shortcomings of different methods of such a selection procedure are discussed.

Financial support by the MATCOR Graduate Program is acknowledged gratefully.