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Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 23: Magnetization / Demagnetization Dynamics II

MA 23.3: Talk

Wednesday, March 28, 2012, 10:15–10:30, H 1012

Mode selective parametric excitation of spin waves in a Ni81Fe19 microstripe — •Thomas Braecher1,2, Philipp Pirro1, Björn Obry1, Alexander A. Serga1, Britta Leven1, and Burkard Hillebrands11Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Gottlieb-Daimler-Straße 47 67663 Kaiserslautern, Germany

Due to their potential application in logic devices and microwave signal processing spin-wave excitations have been intensively studied. However, experiments in microstructured systems remain a challenge since the spin-wave lifetime in commonly used materials like Permalloy (Ni81Fe19) is restricted to a few nanoseconds. We present the experimental observation of parallel parametric amplification of selected thermal spin-wave modes in a transversally magnetized Ni81Fe19 microstripe. By employing Brillouin light scattering microscopy we identify the dominant group, i.e. the spin-wave mode that is preferentially amplified. We show that due to the existing spin-wave quantization in the system it is possible to select one specific mode to be parametrically excited by changing the bias magnetic field. This gives access to transversal spin-wave eigenmodes of the stripe, promising the ability to amplify externally excited propagating spin waves that carry information, and also to modes localized at the stripe edges. This work was recently published in Applied Physics Letters (Appl. Phys. Lett. 99, 162501 (2011)).
Financial support by the DFG and MAINZ is gratefully acknowledged.

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