Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 48: Magnetization / Demagnetization Dynamics IV

MA 48.5: Talk

Thursday, March 19, 2015, 16:00–16:15, EB 301

Parametric amplification of spin waves in a microstructured magnonic waveguide — •Thomas Brächer, Frank Heussner, Philipp Pirro, Tobias Fischer, Alexander A. Serga, and Burkard Hillebrands — Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany

Parallel parametric amplification has proven to be a useful means of spin-wave excitation and amplification in microstructured magnonic waveguides. Therefore, it is a very versatile tool for the field of magnonics, where the limited lifetime of magnons still constitutes a major limitation for, e.g., the construction of microstructured magnonic circuits.

Here, we report on some of the perspectives and limitations of the this technique. In particular, we focus on the velocity and the range of spin waves which are amplified throughout their propagation along a magnonic waveguide. We show that, for the use of a single amplification pulse, one has to find a trade-off between a fast signal propagation and a large range of the amplified spin waves. Here, the latter is limited by the amplification of the thermal noise.