Rezumat
We report the results of experimental study of temperature dependencies of critical current density jc(H,T) for thin epitaxial YBCO films prepared by laser ablation on single crystal substrate SrTiO3. A method for conversion of experimental temperature dependence of magnetization to the temperature dependence of critical current density taking into account for incomplete saturation of magnetization is presented. It allows expanding the application field of this method for lower magnetic fields and temperatures.