Inhomogeneous states in a small magnetic disk with single-ion surface anisotropy

Kireev, V. E.; Иванов, Б. А.

doi:10.1103/physrevb.68.104428

Cited by 21 publications

(24 citation statements)

References 37 publications

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“…Let us start from the energy functional (5). Substituting the vortex solution in the form (7) one can rewrite the vortex energy in the following form .…”

Section: Discussionmentioning

confidence: 99%

“…In common with stray field effects which favour the vortex configuration, the vortex can form the lowest energy state in magnets with a surface anisotropy [5,6]. Such anisotropy, which always appears in real samples, is originated from the symmetry breaking for the boundary sites of the lattice and can result in the specific uniaxial singleion anisotropy of different sings [5,7]. In the disk-shaped magnets the edge surface anisotropy can pin the magnetization along the border in the circular, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Effects of surface anisotropy on magnetic vortex core

Pylypovskyi

Sheka

Kravchuk

et al. 2014

Journal of Magnetism and Magnetic Materials

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“…Let us start from the energy functional (5). Substituting the vortex solution in the form (7) one can rewrite the vortex energy in the following form .…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of surface anisotropy on magnetic vortex core

Pylypovskyi

Sheka

Kravchuk

et al. 2014

Journal of Magnetism and Magnetic Materials

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“…20 Highly non-uniform ground state is found for small particles with a sufficiently high surface anisotropy as well. 21,22 From the perspective of a search for vortex states, the promising magnetic systems are those in which the exchange interaction suppressed or non-existent and the main source of interaction among structural elements is the dipole-dipole interaction of their magnetic moments. These are so-called dipolar magnets, i.e.…”

Section: Introductionmentioning

confidence: 99%

Vortex ground state for small arrays of magnetic particles with dipole coupling

et al. 2013

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We show that a magnetic vortex is the ground state of an array of magnetic particles shaped as a hexagonal fragment of a triangular lattice, even for an small number of particles in the array N ≤ 100. The vortex core appears and the symmetry of the vortex state changes with the increase of the intrinsic magnetic anisotropy of the particle β; the further increase of β leads to the destruction of the vortex state. Such vortices can be present in arrays as small in size as dozen of nanometers.

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“…There are also reports of Monte Carlo simulations of twodimensional magnetic nanodots with surface anisotropy. 17,18 Here the focus is on three-dimensional particles with positive s . We investigate the magnetization processes and hysteresis for the throttled and hedgehog states.…”

mentioning

confidence: 99%

Ferromagnetic nanoparticles with strong surface anisotropy: Spin structures and magnetization processes

et al. 2008

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Monte Carlo simulations are used to investigate the effect of surface anisotropy on the spin configurations and hysteresis loops of ferromagnetic nanoparticles. Spherical particles of radius a are composed of N atoms located on a simple cubic lattice with interatomic spacing a. The particles have 2 ഛ ഛ 13. A classical Heisenberg model is assumed, with surface and bulk anisotropy. When surface anisotropy is positive there are two types of ground states separated by a large energy barrier: a "throttled" configuration with reduced magnetization for intermediate values of surface anisotropy and a "hedgehog" configuration with zero magnetization in the strong surface anisotropy limit. Beyond a threshold, surface anisotropy of either sign induces ͗111͘ easy axes for the net magnetization. Easy-axis hysteresis loops are then square, with a continuous approach to saturation, and the effective anisotropy is deduced either from the switching field or from the initial slope of the perpendicular magnetization curve. The hedgehog state shows a stepwise magnetization curve involving discrete configurations, and it passes to a throttled configuration before saturating. The hysteresis loop has the unusual feature that it involves a state in the first quadrant, which lies on the reversible initial magnetization curve; it is possible to recover the zero-field cooled state after saturation. A survey of the exchange and anisotropy parameters for a range of ferromagnetic materials indicates that the effects of surface anisotropy on the spin configuration should be most evident in nanoparticles of ferromagnetic actinide compounds such as US, and rare-earth metals and alloys with Curie points below room temperature; the effects in nanoparticles of 3d ferromagnets and their alloys are usually insignificant, with the possible exception of FePt.

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Inhomogeneous states in a small magnetic disk with single-ion surface anisotropy

Cited by 21 publications

References 37 publications

Effects of surface anisotropy on magnetic vortex core

Effects of surface anisotropy on magnetic vortex core

Vortex ground state for small arrays of magnetic particles with dipole coupling

Ferromagnetic nanoparticles with strong surface anisotropy: Spin structures and magnetization processes

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