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http://hdl.handle.net/2445/126026
Title: | Change in the magnetic configurations of tubular nanostructures by tuning dipolar interactions |
Author: | Salinas, H. D. Restrepo, Johans Iglesias, Òscar |
Keywords: | Nanoestructures Moments dipolars Magnetisme Nanostructures Dipole moments Magnetism |
Issue Date: | 6-Jul-2018 |
Publisher: | Nature Publishing Group |
Abstract: | We have investigated the equilibrium states of ferromagnetic single wall nanotubes by means of atomistic Monte Carlo simulations of a zig-zag lattice of Heisenberg spins on the surface of a cylinder. The main focus of our study is to determine how the competition between short-range exchange (J) and long-range dipolar (D) interactions influences the low temperature magnetic order of the nanotubes as well as the thermal-driven transitions involved. Apart from the uniform and vortex states occurring for dominant J or D, we find that helical states become stable for a range of intermediate values of γ = D/J that depends on the radius and length of the nanotube. Introducing a vorticity order parameter to better characterize helical and vortex states, we find the pseudo-critical temperatures for the transitions between these states and we establish the magnetic phase diagrams of their stability regions as a function of the nanotube aspect ratio. Comparison of the energy of the states obtained by simulation with those of simpler theoretical structures that interpolate continuously between them, reveals a high degree of metastability of the helical structures that might be relevant for their reversal modes. |
Note: | Reproducció del document publicat a: https://doi.org/10.1038/s41598-018-28598-1 |
It is part of: | Scientific Reports, 2018, vol. 8, p. 10275 |
URI: | http://hdl.handle.net/2445/126026 |
Related resource: | https://doi.org/10.1038/s41598-018-28598-1 |
ISSN: | 2045-2322 |
Appears in Collections: | Articles publicats en revistes (Física de la Matèria Condensada) |
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