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 Hillebrands1 — 1Fachbereich 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.