SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Posters Magnetism V
MA 18.40: Poster
Freitag, 1. Oktober 2021, 10:00–13:00, P
Characterization of superconducting niobium lumped-element-resonators for strong magnon-photon coupling to yttrium-iron-garnet (YIG) structures — •Philipp Geyer1, Karl Heimrich1, Philip Trempler1, Frank Heyroth2, Sandra Gottwals1, and Georg Schmidt1,2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120 Halle (Saale), Germany — 2Interdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, Nanotechnikum Weinberg, 06120 Halle (Saale), Germany
In the past years the field of hybrid quantum magnonics appears a promising candidate for quantum information processing. Here, magnons can be an important mediator for coupling between different quantum states [1]. We investigate superconducting Nb lumped-element-resonators grown on annealed sapphire (0001) substrates. The resonators are fabricated by optical lithography, Nb sputtering and lift-off. The deposition of niobium was done by argon ion sputtering at room-temperature and the niobium was not covered by a protecting layer. Nevertheless, we observe for 50 nm thin films superconducting transition temperatures above 7 K and sufficiently high critical B-fields. Our work is focused on resonators which excite preferably high localized magnetic fields. YIG particles will be transferred from high quality free standing YIG microstructures to achieve strong coupling between microwave photons and magnons [3]. [1] D. Lachange-Quirion et.Al. Science, Vol. 367, Issue 6476, pp. 425-428 (2020) [2] P. Trempler et. Al. Appl. Phys. Lett. 117, 232401 (2020)