We prepared MgB2 thin films on non-textured aluminum (Al) tapes using an electron-beam evaporation technique. Single phases of MgB2 films with a c-axis and without biaxial crystal orientation were obtained with the critical temperatures (Tc) of 19-29.8 K, corresponding to the substrate temperature of 200-280°C. The magnetic field dependences of the critical current density (Jc) were measured at 4.2, 10 and 20 K in the field of 0-12 T applied parallel and perpendicular to the film surface. The Jc at 10 and 20 K in the self field were 3.1×106 A/cm2 and 1.2×106 A/cm2, respectively. Jc at 4.2 K exceeded 106 A/cm2 in the parallel and perpendicular fields of between 0 and 10 T. These results suggest that a MgB2 coated conductor may be one of the most promising candidates for practical MgB2 superconducting wires.
