Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 59: Magnonics III
MA 59.7: Talk
Friday, March 13, 2026, 11:15–11:30, POT/0361
Direction Selective Spin Waves Imaging in Microstructures — •Roméo Beignon1, Chris Köerner2, Rouven Dreyer2, Zeling Xiong3, Katrin Schultheiss3, Helmut Schultheiss3, Vincent Jacques1, Georg Woltersdorf2, and Aurore Finco1 — 1Laboratoire Charles Coulomb, Université de Montpellier, CNRS, Montpellier, France — 2Martin Luther University Halle-Wittenberg, Halle, Germany — 3Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Dresden, Germany
Spin waves can be generated and manipulated at the nanoscale using patterned microstructures and magnetization features. Harnessing these effects is key to the development of magnonic devices. With scanning NV microscopy, we are able to image spin waves with a spatial resolution of about 50 nm. Simultaneously, we probe the stray field produced by non-uniform static magnetic textures hosted in the microstructures and explore their interactions with spin wave modes.
Here, we apply this technique to observe spin waves in Permalloy microstructures. We first investigate spin waves generated via scattering and measure their dispersion relation. Then, we show that the NV center is sensitive to the handedness of the circularly polarized field emitted by spin waves. We can thus selectively image spin waves propagating in different directions and study how they interact with the edges of the Py structure. Finally, we observe discrete magnon modes with high azimuthal indices in disks featuring a vortex state. These measurements open the way to understanding complex non-linear dynamic phenomena in magnetic microstructures.
Keywords: spin waves; scanning NV center microscopy; magnetic texture; chirality