Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Poster Session II
MA 48.37: Poster
Donnerstag, 10. März 2016, 15:00–18:00, Poster B1
Coplanar waveguide based ferromagnetic resonance in thin magnetic films: influence of a superconducting layer — •Philip D. Louis1,2, Matthias Althammer2, Hannes Maier-Flaig1,2, Mathias Weiler1,2, Hans Huebl1,2,3, Rudolf Gross1,2,3, and Sebastian T. B. Goennenwein1,2,3 — 1Physik-Department, Technische Universität München, Garching, Germany — 2Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 3Nanosystems Initiative Munich (NIM), München, Germany
The high-frequency properties of magnetic materials are of general interest from both an application and a fundamental research point of view. Coplanar waveguide (CPW) based ferromagnetic resonance (FMR) allows for a broadband spectroscopy of magnetization dynamics. In order to maximise the FMR signal and enhance sensitivity, it is important to efficiently drive magnetisation dynamics via a CPW. In our experiment, we study the FMR response of cobalt/niobium thin film heterostructures at temperatures above and below the Nb superconducting phase transition temperature. The sample is mounted Co-side down on a CPW and the complex transmission S21 is measured using vector network analysis. We observe an amplitude increase of the Co FMR signal by up to an order of magnitude when the Nb is in its superconducting state. This result can be explained by an efficient confinement of the FMR driving field between the superconducting Nb and the CPW. This effect can be used to increase the FMR signal of ultra thin/weakly magnetic films and has to be accounted for when including superconducting films into functional multi-layers.