biostudies-literatureTacchi SFondo Nacional de Desarrollo Cient?fico y Tecnol?gicoFondazione CariploUniversidad T?cnica Federico Santa Mar?aEuropean Research CouncilCentro para el Desarrollo de la Nanociencia y la Nanotecnolog?aFondazione CDPRENATECH networkCentre National de la Recherche ScientifiqueMinistero dell'Universit? e della RicercaEuropean Commission6776-6783https://www.ebi.ac.uk/biostudies/studies/S-EPMC10375587biostudies-literatureUnknown23(14)Spin waves represent the collective excitations of the magnetization field within a magnetic material, providing dispersion curves that can be manipulated by material design and external stimuli. Bulk and surface spin waves can be excited in a thin film with positive or negative group velocities and, by incorporating a symmetry-breaking mechanism, magnetochiral features arise. Here we study the band diagram of a chiral magnonic crystal consisting of a ferromagnetic film incorporating a periodic Dzyaloshinskii-Moriya coupling via interfacial contact with an array of heavy-metal nanowires. We provide experimental evidence for a strong asymmetry of the spin wave amplitude induced by the modulated interfacial Dzyaloshinskii-Moriya interaction, which generates a nonreciprocal propagation. MoreoNano lettersExperimental Observation of Flat Bands in One-Dimensional Chiral Magnonic Crystals.PMC10375587ECS00000041R20FC3PX8R12106071201153948225PRIN-2020LWPKH7AFB2200012022-1881Albisetti EGallardo RACattoni AGirardi DCortes-Ortuno DTacchi SCarlotti GFlores-Farias JPetti DBrevis FLanderos PScaramuzzi GfalseExperimental Observation of Flat Bands in One-Dimensional Chiral Magnonic Crystals.Spin waves represent the collective excitations of the magnetization field within a magnetic material, providing dispersion curves that can be manipulated by material design and external stimuli. Bulk and surface spin waves can be excited in a thin film with positive or negative group velocities and, by incorporating a symmetry-breaking mechanism, magnetochiral features arise. Here we study the band diagram of a chiral magnonic crystal consisting of a ferromagnetic film incorporating a periodic Dzyaloshinskii-Moriya coupling via interfacial contact with an array of heavy-metal nanowires. We provide experimental evidence for a strong asymmetry of the spin wave amplitude induced by the modulated interfacial Dzyaloshinskii-Moriya interaction, which generates a nonreciprocal propagation. Moreo2023-01-01T00:00:00Z2023 Jul2025-04-05T13:54:27.746Z2025-02-19T03:56:30.72ZS-EPMC103755873734394210.1021/acs.nanolett.2c04215