Influence of sample thickness on magnetic domain structure in ferromagnetic superconductor

The phenomenological approach is applied to ferromagnetic superconductors with uniaxial anisotropy. The Bloch wall energy and the dependence of the domain width on sample thickness are obtained. The magnetic domain structure of the Landau-type (plate-like domain structure) and the chess-board pattern of the domains are considered and the comparision of its energies per unit area as a function of the samplie thickness is presented. Also the influence of the sample thickness on reduced and averaged magnetic induction vector is shown. (author)