A method is reported for the fabrication of Fe-Pt binary alloy nanowire arrays embedded in porous alumina films with controlled diameters and high aspect ratios directly on glass substrates by successive anodization and cathodic electrodeposition in a novel bath with a simple composition. Porous alumina films with different pore sizes were initially formed by anodizing aluminum layers sputter-deposited on glass substrates covered with an indium tin oxide (ITO) film. After the insulative barrier layer was removed through a chemical dissolution, the porous alumina nanostructures on ITO/glass were used as template electrodes in dc electrodeposition to deposit Fe-Pt alloy within the nanopores, leading to integrated Fe-Pt nanowire (phi23-52 nm) arrays on glass with high densities of 1.92-7.85 x 10(14) wire per square meter. The as-deposited Fe-Pt nanowires are composed of polycrystalline tetragonal FePt phase with crystal sizes 2-6 nm across. Thermal annealing at 973 K induced the crystal growth of disordered tetragonal FePt phase with appearance of (001) facet and developed the preferential magnetic orientation and enhanced coercivity in perpendicular direction (along the nanowire axis). (C) 2004 The Electrochemical Society.