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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/126026
Change in the magnetic configurations of tubular nanostructures by tuning dipolar interactions
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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.
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SALINAS, H. D., RESTREPO, Johans and IGLESIAS, Òscar. Change in the magnetic configurations of tubular nanostructures by tuning dipolar interactions. Scientific Reports. 2018. Vol. 8, num. 10275. ISSN 2045-2322. [consulted: 12 of June of 2026]. Available at: https://hdl.handle.net/2445/126026