Dynamical behavior of vortices in thin film magnetic systems

Costa, B. V.; Lima, Anderson Barbosa

doi:10.1016/j.jmmm.2011.09.038

Cited by 6 publications

(2 citation statements)

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“…An important lesson to learn from these fact is that the picture of free vortexes can no longer survive since it is not corroborated by experiments or simulations. However, the entropy can still be introduced by pairs fluctuation due to creation-annihilation processes [16]. To conclude our argument we have to go ahead a bit further.…”

Section: Introductionmentioning

confidence: 87%

“…The challenge then was to produce a reasonable phenomenology capable of explaining the central peaks observed in the simulations and experiments. More recently Costa and Lima [16] showed that the central peak in the two-dimensional XY model can be explained by a vortex-anti-vortex number fluctuation due to local diffusion and creation-annihilation processes. This behavior was seen more recently in the dynamics of vortexes in magnetic nano-dots [17].…”

Section: Introductionmentioning

confidence: 99%

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Kosterlitz-Thouless Transition: The Diluted XY model

Costa¹,

Lima²,

Coura³

et al. 2014

J. Phys.: Conf. Ser.

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Abstract. The effect of nonmagnetic disorder on Berezinskii-Kosterlitz-Thouless (BKT) transition in the two-dimensional ferromagnetic XY model on a square lattice, diluted by randomly placed vacancies can be an important source of information on the role played by vortexes in this transition. The transition temperature TBKT is determined as a function of vacancy density ρv by stiffness ρ and for different size of the lattice. The anomalous behavior for TBKT when ρv is close to the square lattice percolation limit is a consequence of the effect of finite size of lattice and not due the quantum fluctuations as concluded in literature. We obtain that TBKT falls to zero at ρv ≈ 0.40 close to the value 0.41 obtained for the classic model.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%