Microwave resonances of magnetic skyrmions in thin film multilayers

Bhartendu Satywali, Volodymyr P. Kravchuk, Liqing Pan, M. Raju, Shikun He, Fusheng Ma, A. P. Petrović (), Markus Garst and Christos Panagopoulos ()
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Bhartendu Satywali: Nanyang Technological University
Volodymyr P. Kravchuk: Bogolyubov Institute for Theoretical Physics of National Academy of Sciences of Ukraine
Liqing Pan: Research Institute for Magnetoelectronics and Weak Magnetic Field Detection, College of Science, China Three Gorges University
M. Raju: Nanyang Technological University
Shikun He: Nanyang Technological University
Fusheng Ma: Nanyang Technological University
A. P. Petrović: Nanyang Technological University
Markus Garst: Institute for Theoretical Solid State Physics, Karlsruhe Institute of Technology
Christos Panagopoulos: Nanyang Technological University

Nature Communications, 2021, vol. 12, issue 1, 1-8

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

Date: 2021
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DOI: 10.1038/s41467-021-22220-1

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