Magnetization of Layered High-temperature Superconductors with Extended Ferromagnetic Defects

The magnetization of layered high-temperature superconductors (HTSC) with ferromagnetic nanorods as bulk pinning centers is studied in the 2D model of layered HTSC by using a Monte Carlo method. Magnetic part of the interaction energy between a ferromagnetic cylinder of arbitrary radius and constant magnetization and an Abrikosov vortex was calculated in London approximation. The periodic and non-periodic lattices of magnetic defects were considered. The magnetization was investigated at different radii of magnetic defects. The results of calculations were compared with the results for extended nonmagnetic defects.