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MA: Fachverband Magnetismus
MA 20: Magnonics II
MA 20.7: Vortrag
Mittwoch, 19. März 2025, 11:00–11:15, H16
Spatially Resolved Investigation of Spin Wave frequency Multiplication — •Roméo Beignon1, Chris Körner2, Rouven Dreyer2, Georg Woltersdorf2, Vincent Jacques1, and Aurore Finco1 — 1Laboratoire Charles Coulomb, Université de Montpellier, CNRS, Montpellier, France — 2Martin Luther University Halle-Wittenberg, Halle, Germany
Interactions between spin waves and magnetic textures offer promising tools for designing magnonic devices. Among new developments, a frequency multiplication phenomenon has been observed in permalloy microstructures [1]. This generation of a high harmonic frequency has been observed using magnetic resonance measurements on NV center ensembles.
Here, we use scanning NV-center microscopy to investigate this phenomenon further. Our aim is to obtain maps of the harmonic generation with a spatial resolution of about 50 nm, and to correlate them with the magnetic state of the Py microstructures (edges, domain walls, ...).
Our results show that we can detect the spin wave frequency comb with a single NV center in a scanning probe tip. Furthermore, we are able to spatially map the effect of each harmonic on the NV center separately, revealing a non-trivial behavior. These measurements are a first step towards the understanding of the interplay between the non-linear process that generates the harmonics and the magnetic texture.
[1] Köerner et al., Science 375. 1165-1169 (2022)
Keywords: spin waves; non-linear excitations; scanning NV center microscopy; magnetic texture