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Magnetic Ordering in Chiral Nanotubes with Competing Interactions

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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2025, Tutor: Òscar Iglesias Clotas

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In this work, we investigate the low-temperature equilibrium magnetic configurations of single-wall magnetic nanotubes with competing exchange and dipolar interactions using Monte Carlo simulations within the framework of the classical 3D Heisenberg model. The nanotubes are constructed by folding planar spin lattices at various chiral angles, allowing control over radius, length, and underlying lattice. Through the analysis of the different magnetization components and energies, we have revealed a rich variety of stable magnetic states, including uniform, vortex-like, and helical configurations, whose nature strongly depends on the tube aspect ratio, length, chirality, and the ratio γ = g/J. The inclusion of anisotropy further enriches the phase space,
stabilizing radial and mixed magnetization textures. These findings highlight the crucial role of geometry and interaction competition in chiral nanomagnets and provide insight into the design of functional magnetic nanostructures.

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Magnetic Ordering in Chiral Nanotubes with Competing Interactions