Spin waves in magnonic systems: localization and propagation
M.Sc. Szymon Mieszczak

Date, Time
20.10, 15:00 - 16:00

Location
Link to MSTeams meeting

Magnonics is a field of research and technology which uses magnetic nanostructures to control the propagation and localization of magnetic excitations, called spin waves. This control is realized by tailoring the geometry of nanostructure and modifying the internal landscape of the magnetic field, or by coupling the spin waves to external biases. The steering of localization and propagation is essential for information transmission. The interplay between wave localization and propagation determines the speed and direction of the wave signal, and even then whether the signal will be transmitted at all.

The objective of my thesis is theoretical studies on spin waves in typical magnonic systems in the form of planar nanostructures, like waveguides, magnonic crystals, and quasicrystals. In my research, I worked on the coherent spin wave guiding in magnonic waveguides and on the spin wave localization in patterned layers in the presence of defects and interfaces. I was also interested in the steering of spin waves by non-magnetic signals.

The thesis contains four publications [1-4] covering these topics. In the first publication [1], I discussed the relation between the spatial distribution of spin waves in magnonic crystals and the coupling with surface acoustic waves. In the next work [2], I presented the studies on the spin wave propagation in curved waveguides. The later publication [3] focuses on the spin wave localization at the interface between two magnonic crystals. In the last paper included in the thesis [4], I discussed the impact of disorder in magnonic quasicrystal on the spin wave localization.

[1] C. L. Chang, S. Mieszczak, M. Zelent, V. Besse, U. Martens, R. R. Tamming, J. Janusonis, P. Graczyk, M. Münzenberg, J. W. Kłos, and R. I. Tobey, Driving
Magnetization Dynamics in an On-Demand Magnonic Crystal via the Magnetoelastic Interactions, Physical Review Applied, 10, 064051 (2018).
[2] S. Mieszczak, O. Busel, P. Gruszecki, A. N. Kuchko, J. W. Kłos, and M. Krawczyk, Anomalous Refraction of Spin Waves as a Way to Guide Signals in Curved Magnonic Multimode Waveguides, Physical Review Applied, 13, 054038 (2020).
[3] S. Mieszczak, and J. W. Kłos, Interface modes in planar one-dimensional magnonic crystals, Scientific Reports, 12, 11335 (2022).
[4] S. Mieszczak, M. Krawczyk, and J W. Kłos, Spin-wave localization on phasonic defects in a one-dimensional magnonic quasicrystal, Physical Review B, 106, 064430 (2022)