Vortex States of a Superconducting Film from a Magnetic Dot Array

Details Vortex States of a Superconducting Film from a Magnetic Dot Array Vortex States of a Superconducting Film from a Magnetic Dot Array

2003-10-09

arxiv.org/abs/cond-mat/0310221v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.93.057003

Using Ginzburg-Landau theory, we find novel configurations of vortices in superconducting thin films subject to the magnetic field of a magnetic dot array, with dipole moments oriented perpendicular to the film. Sufficiently strong magnets cause the formation of vortex-antivortex pairs. In most cases, the vortices are confined to dot regions, while the antivortices can form a rich variety of lattice states. We propose an experiment in which the perpendicular component of the dot dipole moments can be tuned using an in-plane magnetic field. We show that in such an experiment the vortex-antivortex pair density shows broad plateaus as a function of the dipole strength. Many of the plateaus correspond to vortex configurations which break dot lattice symmetries. In some of these states, the vortex cores are strongly distorted. Possible experimental consequences are mentioned.

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