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Resonant properties of dipole skyrmions in amorphous Fe/Gd multilayers

Title
Resonant properties of dipole skyrmions in amorphous Fe/Gd multilayers
Authors
Montoya, S. A.Couture, S.Chess, J. J.Lee, J. C. T.Kent, N.Im, M. -Y.Kevan, S. D.Fischer, P.McMorran, B. J.Roy, S.Lomakin, V.Fullerton, E. E.
DGIST Authors
Im, M. -Y.
Issue Date
2017-06-05
Citation
Physical Review B, 95(22)
Type
Article
Article Type
Article
Keywords
DynamicsFieldMagnetic SkyrmionsPermeabilityRoom TemperatureThin Films
ISSN
2469-9950
Abstract
The dynamic response of dipole skyrmions in Fe/Gd multilayer films is investigated by ferromagnetic resonance measurements and compared to micromagnetic simulations. We detail thickness- and temperature-dependent studies of the observed modes as well as the effects of magnetic field history on the resonant spectra. Correlation between the modes and the magnetic phase maps constructed from real-space imaging and scattering patterns allows us to conclude that the resonant modes arise from local topological features such as dipole skyrmions but do not depend on the collective response of a close-packed lattice of these chiral textures. Using micromagnetic modeling, we are able to quantitatively reproduce our experimental observations which suggests the existence of localized spin-wave modes that are dependent on the helicity of the dipole skyrmion. We identify four localized spin-wave excitations for the skyrmions that are excited under either in-plane or out-of-plane rf fields. Lastly we show that dipole skyrmions and nonchiral bubble domains exhibit qualitatively different localized spin-wave modes. © 2017 American Physical Society.
URI
http://hdl.handle.net/20.500.11750/4156
DOI
10.1103/PhysRevB.95.224405
Publisher
American Physical Society
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceETC1. Journal Articles


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