Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.8: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Enhancement of the spin-wave propagation distance in microstructures by localized parallel parametric amplification — •Frank Heussner¹, Thomas Brächer², Philipp Pirro³, Thomas Meyer¹, Tobias Fischer¹, Moritz Geilen¹, Björn Heinz¹, Bert Lägel¹, Alexander A. Serga¹, and Burkard Hillebrands¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaisersautern, Germany — ²Univ. Grenoble Alpes, CNRS, CEA, INAC-SPINTEC, 38054 Grenoble, France — ³Institut Jean Lamour, Université Lorraine, CNRS, 54506 Vandoeuvre-lès-Nancy, France

We report on the localized parallel parametric amplification of a coherent spin wave in the non-adiabatic regime. We demonstrate that due to the co-propagating parametrically created magnons a strong enhancement of the propagation distance of the input spin wave can be realized. A microwave current flowing inside a transmission line with modulated width placed underneath the transversely magnetized Ni₈₁Fe₁₉ waveguide creates an alternating magnetic field, which is locally enhanced at the position of the narrowing. Only in the area of this locally enhanced field effective parametric pumping takes place. In addition to the strong amplification in the non-adiabatic regime, we show that the localization of the pumping field leads to a high signal-to-noise ratio of the amplification process behind the amplification area. Our results show that localized parallel parametric amplification recommends itself for applications in future spintronic devices to overcome the limitations due to a limited spin-wave propagation distance.