is rotating in the direction indicated by an arrow 12 after drying the film a laser beam having a 50 microns diameter is radiated repeatedly to the substrate the position of the laser beam is shifted to the right direction the axial direction of the cylinder 1 while the substrate 1 is rotating around its axis by this process a continuous helical supercondutor 5 is formed on the cylinder 1 each part of the helix 5 1 is isolated from the adjacent part 5 2 by the helical groove 3 which has been removed by laser sublimation as a result a superconducting electromagnet in the form of a coil is constructed when laser annealing is utilized in addition to laser sublimation an advanced process can be performed first a ceramic film is formed on a surface in such a way that the film does not have yet superconducting structure a presciribed portion of the film is melted by irradiation with a laser beam laser annealing the irradiated portion is endowed with superconducting property by recrystallization during cooling in the same time the ceramic film may be cooled if necessary then another prescribed portion of the ceramiq film is removed by laser sublimation by this process ceramic pattern which may be composed.