SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.8: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Design of an rf antenna for fast skyrmion lattice relaxation — •Ephraim Spindler1, Philipp Schwenke1, Abbass Hamadeh1, Raphael Gruber2, Vitaliy Vasyuchka1, Mathias Kläui2, and Mathias Weiler1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Institut für Physik, Johannes Gutenberg-Universität Mainz, Mainz, Germany
Understanding skyrmion dynamics is a key requirement for their potential applications in data storage and processing. We designed an omega-type microwave antenna to study the lattice formation dynamics of micrometer-scale skyrmions in thin film materials under rf excitation. We evaluated the antenna performance by measuring its electrical transmission and the magnetic field generated by dc current flow through the antenna. To quantify the rf performance of the antenna further, we used it for ferromagnetic resonance (FMR) measurements on reference thin-film Y3Fe5O12 samples. From our power-dependent FMR measurements we determined the microwave power of the transition to the nonlinear regime. The microwave power threshholds are compared to expectations from micromagnetic simulations considering the inhomogeneous rf field profile of the antenna. These power-dependent measurements and simulations allowed us to quantify the rf fields generated by the antenna. The rf fields generated by the omega antenna can potentially accelerate the skyrmion lattice relaxation through its direct influence on skyrmion size oscillations.