Frustrated magnetic vortices in hexagonal lattice of magnetic nanocaps

Сапожников, М. В.; Ermolaeva, O. L.; Gribkov, B. A.; Nefedov, I. M.; Karetnikova, I. R.; Gusev, S. A.; Rogov, Vladimir V.; Troitskii, B. B.; Khokhlova, L. V.

doi:10.1103/physrevb.85.054402

Cited by 28 publications

(19 citation statements)

References 36 publications

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“…It has been shown that the ferromagnetic behavior of such a structure is governed by the geometry of the network. [18][19][20][21] However, neither a detailed analysis of the magnetic properties has been done yet, nor has an appropriate model been suggested for this system so far.…”

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confidence: 99%

Three-dimensional artificial spin ice in nanostructured Co on an inverse opal-like lattice

et al. 2013

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The evolution of the magnetic structure for an inverse opal-like structure under an applied magnetic field is studied by small-angle neutron scattering. The samples were produced by filling the voids of an artificial opal film with Co. It is shown that the local configuration of magnetization is inhomogeneous over the basic element of the inverse opal-like lattice structure (IOLS) but follows its periodicity. Applying the "ice-rule" concept to the structure, we describe the local magnetization of this ferromagnetic three-dimensional lattice. We have developed a model of the remagnetization process predicting the occurrence of an unusual perpendicular component of the magnetization in the IOLS which is defined only by the direction and strength of the applied magnetic field.

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confidence: 99%

Three-dimensional artificial spin ice in nanostructured Co on an inverse opal-like lattice

et al. 2013

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“…The coupling strength, however, will strongly depend on the Py thickness. It is expected that this coupling might influence the in-plane circulation orientation of connected caps, leading to frustration in a hexagonal cap array [43,44] or even to the formation of anti-vortices [48,49] at the contact area when the circulations are contra-rotating. Please note that due to the curved particle surface, the thickness of the deposited Py layer in radial direction decreases from the top center of the film cap towards the rim, thus the vortex core area is expected to be enlarged compared to planar vortex structures.…”

Section: Resultsmentioning

confidence: 99%

“…Strong coupling is induced by deposition of thick Py films, where neighboring caps will be interconnected at the contact areas, resulting in direct magnetic exchange coupling. Here, we report on the influence of magnetic coupling on the reversal behavior and the in-plane circulation orientation of neighboring caps, which can lead to frustration in a hexagonal cap array [43,44] or even to unexpected magnetization configurations.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, a two dimensional vortex lattice was prepared by magnetic film deposition onto self-assembled densely packed particle arrays forming magnetic cap structures [25,[39][40][41][42][43][44]. Strong coupling is induced by deposition of thick Py films, where neighboring caps will be interconnected at the contact areas, resulting in direct magnetic exchange coupling.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic coupling of vortices in a two-dimensional lattice

et al. 2015

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We investigated the magnetization reversal of magnetic vortex structures in a two-dimensional lattice. The structures were formed by permalloy (Py) film deposition onto large arrays of selfassembled spherical SiO 2 -particles with a diameter of 330 nm. We present the dependence of the nucleation and annihilation field of the vortex structures as a function of the Py layer thickness (aspect ratio) and temperature. By increasing the Py thickness up to 90 nm or alternatively by lowering the temperature the vortex structure becomes more stable as expected. However, the increase of the Py thickness results in the onset of strong exchange coupling between neighboring Py caps due to the emergence of Py bridges connecting them. In particular, we studied the influence of magnetic coupling locally by in-field scanning magneto-resistive microscopy and full-field magnetic soft x-ray microscopy, revealing a domain-like nucleation process of vortex states, which arises via domain wall propagation due to exchange coupling of the closely packed structures. By analyzing the rotation sense of the reversed areas, large connected domains are present with the same circulation sense. Furthermore, the lateral core displacements when an in-plane field is applied were investigated, revealing spatially enlarged vortex cores and a broader distribution with increasing Py layer thickness. In addition, the presence of some mixed states, vortices and c-states, is indicated for the array with the thickest Py layer.

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“…Thus far the magneto-optical properties of magnetic films on colloidal crystals have been investigated 6 . Following this initial work there has been interest in geometrical frustration being built into such nanostructures [7][8][9] . In those works the frustration originated from the remanent state vortex on a given dome being unable to satisfy all it's nearest-neighbor interactions with other vortices within the HCP lattice.…”

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confidence: 99%