Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 46: Poster II

MA 46.35: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster C

Homogeneous permanent magnetic field for magnonic applications — •Gabriel Schwöbel, Vitaliy I. Vasyuchka, Aleksander A. Serga, and Burkard Hillebrands — Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Universität Kaiserslautern Landau, 67663 Kaiserslautern, Germany

Our work addresses the development of a homogeneous permanent magnetic field experimental setup for a variety of applications, primarily in the field of magnonics. Particularly sensitive are spin-wave phase measurements, which require a high degree of homogeneity, as well as the minimisation of any noise that might be imposed by using an electromagnet.

The setup is inspired from a paper which includes two NeFeB permanent magnets, a soft magnetic yoke and pole shoes. The main goal is to figure out a suitable shape of the yoke and the pole shoes which provide a homogenious magnetic flux distribution over macroscopic distances (e.g. 10 mm) with. To achieve this goal, COMSOL Multiphysics was used to simulate the field strength distribution for different shapes of pole shoes.

We analysed different types of pole shoes to ensure improved homogeneity for different gap sizes. Since the required homogenity is approximately given by the line width of the spin wave excitations studied in yttrium-iron garnet, we looked for a value of around 50 µT in a 1 cm cube centred on the gap.

Keywords: Magnonics; Permanentmagnet