Bi‐Stability of Magnetic Skyrmions in Ultrathin Multilayer Nanodots Induced by Magnetostatic Interaction

Zelent, Mateusz; Tóbik, J.; Krawczyk, Maciej; Guslienko, K. Yu.; Mruczkiewicz, M.

doi:10.1002/pssr.201700259

Cited by 20 publications

(21 citation statements)

References 34 publications

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“…28 as a function of temperature. The skyrmion bi-stability at zero applied field was simulated recently in thick multilayer dots due to the effect of the dipolar interactions 30 . Importantly, our model also allows us to estimate the energy barrier between the states with the skyrmions of two diameters.…”

Section: Resultsmentioning

confidence: 99%

Distinct magnetic field dependence of Néel skyrmion sizes in ultrathin nanodots

Tejo

Riveros

Escrig

et al. 2018

Sci Rep

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We investigate the dependence of the Néel skyrmion size and stability on perpendicular magnetic field in ultrathin circular magnetic dots with out-of-plane anisotropy and interfacial Dzyaloshinskii-Moriya exchange interaction. Our results show the existence of two distinct dependencies of the skyrmion radius on the applied field and dot size. In the case of skyrmions stable at zero field, their radius strongly increases with the field applied parallel to the skyrmion core until skyrmion reaches the metastability region and this dependence slows down. More common metastable skyrmions demonstrate a weaker increase of their size as a function of the field until some critical field value at which these skyrmions drastically increase in size showing a hysteretic behavior with coexistence of small and large radius skyrmions and small energy barriers between them. The first case is also characterized by a strong dependence of the skyrmion radius on the dot diameter, while in the second case this dependence is very weak.

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Section: Resultsmentioning

confidence: 99%

Distinct magnetic field dependence of Néel skyrmion sizes in ultrathin nanodots

Tejo

Riveros

Escrig

et al. 2018

Sci Rep

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“…However, the magnetostatic interaction increases with the dot thickness increasing and inevitable results in the stabilization of the Bloch skyrmions for relatively small values of the interface DMI. This effect was very recently simulated by Zelent et al [34]. It was shown that increasing the dot thickness the multilayer (Ir/Co/Pt) n dot is in the Bloch skyrmion state for the number of the layer repeats  n 9 if J D <0.5 mJ m −2 or, alternatively, the large-radius Bloch skyrmion state is realized for the single layer Co/Pt dot at J D =0.95 mJ m −2 for the Cothickness >3 nm (the dot radius was 250 nm).…”

Section: Dm Ementioning

confidence: 62%

Collective magnetic skyrmion gyrotropic modes in a dot chain

Gareeva

Guslienko

2018

J. Phys. Commun.

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We investigate the collective gyrotropic modes in a linear chain of ferromagnetic nanodots in a skyrmion magnetization state. Individual skyrmions in the dots (with thickness about of 1 nm and radius about of 100 nm) are assumed to be stabilized by interplay of isotropic exchange and Dzyaloshinskii-Moriya exchange interactions, magnetic anisotropy and magnetostatic interactions. We consider the dipolar and quadrupolar interactions between moving skyrmions in the dots as prevailing mechanism responsible for dynamic interdot magnetostatic coupling. The frequency dispersion relations of the collective skyrmion gyrotropic excitations are calculated for Bloch and Neel skyrmion configurations and related differences in the frequencies are discussed. The accounting of magnetostatic interactions between the skyrmions removes phase degeneracy of the gyrotropic frequency existing for isolated skyrmions and allows distinguishing the Bloch and Neel skyrmionic configurations by their dynamic response. The interdot magnetostatic coupling and frequency bandwidth are maximal for the large-radius Bloch skyrmions in the relatively thick dots.

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“…Skyrmions can be stabilized in ultrathin films by the interplay of an external magnetic field, perpendicular anisotropy and the Dzyaloshinskii-Moriya interaction (DMI) that is induced at the interfaces of the ferromagnetic/non-magnetic metal [6]. In the case of multilayer structures, there is additional contribution from the dipolar interactions that leads to the stabilization of stray field skyrmions [7,8]. It was found that confinement due to geometry can increase the stability of the skyrmion significantly [9].…”

Section: Introductionmentioning

confidence: 99%

Skyrmion Formation in Nanodisks Using Magnetic Force Microscopy Tip

et al. 2021

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We demonstrated numerically the skyrmion formation in ultrathin nanodisks using a magnetic force microscopy tip. We found that the local magnetic field generated by the magnetic tip significantly affects the magnetization state of the nanodisks and leads to the formation of skyrmions. Experimentally, we confirmed the influence of the local field on the magnetization states of the disks. Micromagnetic simulations explain the evolution of the magnetic state during magnetic force microscopy scanning and confirm the possibility of skyrmion formation. The formation of the horseshoe magnetic domain is a key transition from random labyrinth domain states into the skyrmion state. We showed that the formation of skyrmions by the magnetic probe is a reliable and repetitive procedure. Our findings provide a simple solution for skyrmion formation in nanodisks.

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Bi‐Stability of Magnetic Skyrmions in Ultrathin Multilayer Nanodots Induced by Magnetostatic Interaction

Cited by 20 publications

References 34 publications

Distinct magnetic field dependence of Néel skyrmion sizes in ultrathin nanodots

Distinct magnetic field dependence of Néel skyrmion sizes in ultrathin nanodots

Collective magnetic skyrmion gyrotropic modes in a dot chain

Skyrmion Formation in Nanodisks Using Magnetic Force Microscopy Tip

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