Vortex-antivortex annihilation dynamics in a square mesoscopic superconducting cylinder
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Data
2009-07-17
Autores
Sardella, Edson [UNESP]
Lisboa Filho, Paulo Noronha [UNESP]
Silva, Clecio C. de Souza
Cabral, Leonardo Ribeiro Eulálio
Ortiz, Wilson Aires
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Editor
Amer Physical Soc
Resumo
The dynamics of the annihilation of a vortex-antivortex pair is investigated. The pair is activated magnetically during the run of a simulated hysteresis loop on a square mesoscopic superconducting cylinder with an antidot inserted at its center. We study the nucleation of vortices and antivortices by first increasing the magnetic field, applied parallel to the axis of the sample, from zero until the first vortex is created. A further increase in the field pulls the vortex in, until it reaches the antidot. As the polarity of the field is reversed, an antivortex enters the scene, travels toward the center of the sample, and eventually the pair is annihilated. Depending on the sample size, its temperature, and Ginzburg-Landau parameter, the vortex-antivortex encounter takes place at the antidot or at the superconducting sea around it. The position and velocity of the vortex and antivortex singularities were evaluated as a function of time. The current density, magnetization, and order-parameter topology were also calculated. © 2009 The American Physical Society.
Descrição
Palavras-chave
current density, flux pinning, Ginzburg-Landau theory, hysteresis, magnetic field effects, magnetisation, nucleation
Como citar
Physical Review B - Condensed Matter and Materials Physics, v. 80, n. 1, 2009.