Eigenmodes of Néel skyrmions in ultrathin magnetic films

Zhang, Vanessa Li; Hou, C. G.; Di, Kai; Lim, H. S.; Ng, S. C.; Pollard, Shawn; Yang, Hyunsoo; Kuok, M. H.

doi:10.1063/1.4983806

Cited by 23 publications

(20 citation statements)

References 39 publications

(87 reference statements)

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“…It is instructive to compare our results with previous work on bulk magnets with a Dzyaloshinskii–Moriya interaction 3 – 8 . The magnetic skyrmion lattice of these systems at low temperatures is known to possess a CCW mode and a clockwise (CW) mode for IP ac magnetic fields, as well as a breathing mode for OP ac fields.…”

Section: Discussionmentioning

confidence: 53%

“…GaV 4 S 8 ) 1 , 2 . In both types of system, the skyrmions exhibit clockwise (CW) and counterclockwise (CCW) gyration modes as well as a breathing (BR) mode 3 – 8 . In contrast with magnetic skyrmion arrays in bulk single crystals, Néel skyrmions at ferromagnet–heavy-metal (FM-HM) interfaces are stabilised by the interfacial Dzyaloshinskii–Moriya interaction.…”

Section: Introductionmentioning

confidence: 99%

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Microwave resonances of magnetic skyrmions in thin film multilayers

et al. 2021

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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.

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Section: Discussionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Microwave resonances of magnetic skyrmions in thin film multilayers

et al. 2021

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“…Due to the fundamental interest and high importance for the applications the number of studies of magnon spectra of skyrmions were recently carried out [23][24][25][26][27][28][29][30][31][32]. However, most of these studies are numerical and the existing theories are far from the completeness.…”

Section: Introductionmentioning

confidence: 99%

Spin eigenmodes of magnetic skyrmions and the problem of the effective skyrmion mass

et al. 2018

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Properties of magnon modes localized on a ferromagnetic skyrmion are studied. Three types of possible asymptotic behavior of the modes eigenfrequencies are found for the case of large skyrmion radius Rs, namely ω0 ∼ R −2 s for the breathing mode, ω −|µ| ∼ R −1 s and ω |µ| ∼ R −3 s for modes with negative and positive azimuthal quantum numbers, respectively. A number of properties of the magnon eigenfunctions are determined. This enables us to demonstrate that the skyrmion dynamics based on the traveling wave model is described by the massless Thiele equation.

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“…GaV 4 S 8 ) [1,2]. In both types of system, the skyrmions exhibit clockwise (CW) and counterclockwise (CCW) gyration modes as well as a breathing (BR) mode [3][4][5][6][7][8]. In contrast with magnetic skyrmion arrays in bulk single crystals, Néel skyrmions at ferromagnet-heavy metal (FM-HM) interfaces are stabilized by the interfacial Dzyaloshinskii-Moriya interaction.…”

Section: Introductionmentioning

confidence: 99%

Microwave resonances of magnetic skyrmions in thin film multilayers

Satywali,

Kravchuk,

Pan

et al. 2021

Preprint

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Non-collinear magnets exhibit a rich array of dynamic properties at microwave frequencies. They can host nanometer-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.

show abstract

Eigenmodes of Néel skyrmions in ultrathin magnetic films

Cited by 23 publications

References 39 publications

Microwave resonances of magnetic skyrmions in thin film multilayers

Microwave resonances of magnetic skyrmions in thin film multilayers

Spin eigenmodes of magnetic skyrmions and the problem of the effective skyrmion mass

Microwave resonances of magnetic skyrmions in thin film multilayers

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