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Vortex structure in magnetic nanodots: Dipolar interaction, mobile spin model, phase transition and melting.

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Title: Vortex structure in magnetic nanodots: Dipolar interaction, mobile spin model, phase transition and melting.
Authors: Bailly-Reyre, Aurélien1 (AUTHOR) abaillyr@lpnhe.in2p3.fr, Diep, H.T.1,2 (AUTHOR) diep@cyu.fr
Source: Journal of Magnetism & Magnetic Materials. Jun2021, Vol. 528, pN.PAG-N.PAG. 1p.
Subjects: Magnetic structure, Phase transitions, Spheromaks, Spin exchange, Melting, Magnetic anisotropy
Abstract: • Dipolar interaction causes the vortex magnetic structure in nanodots. • Non-zero perpendicular magnetization at the dot center may have interesting applications. • Mobility of spins causes the melting of nanodots layer by layer. • Phase transition is shown as a function of spin concentration. We study in this article properties of a nanodot embedded in a support by Monte Carlo simulation. The nanodot is a piece of simple cubic lattice where each site is occupied by a mobile Heisenberg spin which can move from one lattice site to another under the effect of the temperature and its interaction with neighbors. We take into account a short-range exchange interaction between spins and a long-range dipolar interaction. We show that the ground-state configuration is a vortex around the dot central axis: the spins on the dot boundary lie in the xy plane but go out of plane with a net perpendicular magnetization at the dot center. Possible applications are discussed. Finite-temperature properties are studied. We show the characteristics of the surface melting and determine the energy, the diffusion coefficient and the layer magnetizations as functions of temperature. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• Dipolar interaction causes the vortex magnetic structure in nanodots. • Non-zero perpendicular magnetization at the dot center may have interesting applications. • Mobility of spins causes the melting of nanodots layer by layer. • Phase transition is shown as a function of spin concentration. We study in this article properties of a nanodot embedded in a support by Monte Carlo simulation. The nanodot is a piece of simple cubic lattice where each site is occupied by a mobile Heisenberg spin which can move from one lattice site to another under the effect of the temperature and its interaction with neighbors. We take into account a short-range exchange interaction between spins and a long-range dipolar interaction. We show that the ground-state configuration is a vortex around the dot central axis: the spins on the dot boundary lie in the xy plane but go out of plane with a net perpendicular magnetization at the dot center. Possible applications are discussed. Finite-temperature properties are studied. We show the characteristics of the surface melting and determine the energy, the diffusion coefficient and the layer magnetizations as functions of temperature. [ABSTRACT FROM AUTHOR]
ISSN:03048853
DOI:10.1016/j.jmmm.2021.167813