부산대학교 도서관

High-T/sub c/ superconducting magnets built with Y-Ba-Cu-O or Bi(Pb)-Sr-Ca-Cu-O thick films are discussed. Critical current densities of the samples prepared by an oxalate route are between 7000 and 23000 A/cm/sup 2/ at helium temperatures depending on the details of the preparation. The self-magnetic field of the individual layer rings are 0.5-1.7 mT which can produce field strength of the magnets of 55-178 mT, corresponding to the experimental critical currents. If the specimens of oxide-nitrate reactions can provide critical current densities of 5000-15000 A/cm/sup 2/ at nitrogen temperatures they lead to the number of ampere-turns of 550-22500 A/cm and magnetic field intensity of 69 mT -2.82 T. Since the applicable techniques of the film preparation are very flexible concerning the shape and size of the products, magnetic field profiles of different character can be obtained for various purposes.ETX