Monte Carlo simulation of the hysteresis phenomena on ferromagnetic nanotubes.
In this work the hysteretic properties of single wall ferromagnetic nanotubes were studied. Hysteresis loops were computed on the basis of a classical Heisenberg model involving nearest neighbor interactions and using a Monte Carlo method implemented with a single spin movement Metropolis dynamics. Nanotubes with square and hexagonal unit cells were studied varying their diameter, temperature and magneto-crystalline anisotropy. Effects of the diameter were found stronger in the square unit cell magnetic nanotubes (SMNTs) than in the hexagonal unit cell magnetic nanotubes (HMNTs). The ferromagnetic behavior was observed in SMNTs at higher temperature than in HMNTs. Moreover in both cases, SMNTs and HMNTs, the magneto-crystalline anisotropy in the longitudinal direction showed a linear correspondence with the coercive field.
PCM Computational Applications, Universidad Nacional de Colombia, Sede Manizales, A. A. 127 Manizales-Colombia.
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Salazar-Enríquez
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J
Restrepo
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Restrepo-Parra
D003198:Computer Simulation; D060526:Magnetic Fields; D059346:Magnets; D008422:Materials Testing; D008962:Models, Theoretical; D009010:Monte Carlo Method; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D017711:Nonlinear Dynamics; D010316:Particle Size; D012542:Scattering, Radiation