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In this work we investigate the vortex dynamics in a square mesoscopic superconducting cylinder in the presence of an applied magnetic field parallel to its axis. The rectangular cross-section of the sample is L 2 and an engineered columnar defect of area d 2 at the center is taken into account; L = 12x(0) for all simulations while d varies discretely from 1x(0) to 10x(0). We study the magnetization and the vortex configuration, increasing the magnetic field from zero to the normal state field. We found that for d 7x(0) no vortices in the superconductor area are possible. Also, if the size of the defect is reduced, the nucleation fields decrease.

Effect of an columnar defect on vortex configuration in a superconducting mesoscopic sample