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- Vortex-antivortex annihilation dynamics in a square mesoscopic superconducting cylinder
- Universidade Estadual Paulista (UNESP)
- Universidade Federal de Pernambuco (UFPE)
- Universidade Federal de São Carlos (UFSCar)
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco (FACEPE)
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
- 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.
- Physical Review B. College Pk: Amer Physical Soc, v. 80, n. 1, p. 4, 2009.
- Amer Physical Soc
- current density
- flux pinning
- Ginzburg-Landau theory
- magnetic field effects
- Acesso restrito
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