Speaker
Description
Nanotechnology in magnonics advanced considerably in recent years and allowed for on-chip excitation of coherent magnons with wavelengths down to about 50 nm [1]. Still further progress is needed to optimize the performance of magnons in integrated circuits. We explore two routes to advance nanomagnonics and enhance the frequency bandwidth of on-chip excited magnons. On the insulating ferrimagnet yttrium iron garnet (YIG) we integrated metallic nanodisks which we irradiated by microwave-modulated laser light to excite their plasmonic resonance. Using inelastic light scattering (BLS) microscopy we evidenced the emission of short-wave magnons in YIG [2]. Stimulated by magnon band structure modifications by surface corrugation [3] we deposited ferromagnetic thin films of metallic Ni80Fe20 on specific periodic lattices of DNA nanostructures with feature sizes (lattice periods) on the nm (10 nm) length scale. Spatially resolved x-ray magnetic circular dichroism and BLS measurements indicated the local modification of static and dynamic Ni80Fe20 properties, respectively, by the DNA. In our talk, we report on our recent experiments in nanomagnonics. We thank SNSF for financial support via grant No. 197360 and the following collaborators for their cooperation: V. Karakhanyan, M. Xu, M.A. Suarez, A.J.M. Deenen, M. Raschetti, A. Mucchietto, T. Grosjean, S. Wintz, M. Pascal, and M.M.C. Bastings.
References
[1] B. Flebus et al., J. Phys.: Condens. Matter 36, 363501 (2024).
[2] A. Duvakina et al., https://arxiv.org/abs/2507.10742
[3] R. A. Gallardo et al., Phys. Rev. B 97, 144405 (2018).