Vortex structure of HTSC in an inhomogeneous magnetic field

The penetration of a magnetic flux into an anisotropic superconductor placed in a gradient magnetic field equivalent to a permanent magnet field is studied numerically. Vortex configurations formed in a defect-free superconductor and also in a superconductor contained defects are calculated. It is shown that the penetration of an inhomogeneous magnetic field into a layered superconductor occurs via the formation of incomplete vortex lines at the boundary, which implies to the appearance of a magnetic field component parallel to the layers. The dependences of the magnetization and energy in magnetic field are calculated for a tree-dimensional HTSC sample and it is shown that there are minima at the energy plot corresponding to stable positions of a magnet with respect to the superconductor.