Microwave resonances of magnetic skyrmions in thin film multilayers

• DOI: 10.1038/s41467-021-22220-1
• Publication Date: 2021-03-26T11:03:06Z
• Authors: Bhartendu Satywali; Volodymyr P. Krav...; Liqing Pan; M. Raju; Shikun He; Fusheng Ma; A. P. Petrović; Markus Garst; Christos Panagopo...
• Keywords: Skyrmion; Magnon

Abstract Non-collinear magnets exhibit a rich array of dynamic properties at microwave frequencies. They can host nanometre-scale topological textures known as skyrmions, whose spin resonances are expected to be highly sensitive their local magnetic environment. Here, we report resonance study an [Ir/Fe/Co/Pt] multilayer hosting Néel skyrmions room temperature. Experiments reveal two distinct the skyrmion phase during in-plane ac excitation, with frequencies between 6–12 GHz. Complementary micromagnetic simulations indicate that net dipole moment rotates counterclockwise (CCW) both resonances. The magnon probability distribution for lower-frequency is localised within isolated unlike higher-frequency mode which principally originates from areas skyrmions. However, modes depend sensitively on out-of-plane dipolar coupling, controlled via ferromagnetic layer spacing in our heterostructures. gyrations stable reported this temperature encourage development new material platforms and applications based Moreover, architecture enables spectra tuned, thus extending functionality such over broadband frequency range.