Fabrication of Iron-Cobalt-Indium Alloy Nanowires in AAO Template by AC Electrodeposition: Investigation of the Indium Concentrations on the Magnetic Properties of Nanowires

Iron-cobalt and iron-cobalt-indium nanowires were fabricated with a diameter of 32 nm. Iron-cobalt and iron-cobalt-indium alloy nanowire arrays were grown using AC electrodeposition into nanopores of anodic aluminum oxide (AAO) template. Anodic aluminum oxide template with a diameter of 32 nm and a distance between holes of 100 nm was synthesized as a template by using the two-step anodizing method of aluminum foil and using oxalic acid. The effect of adding indium impurities on the magnetic properties of iron-cobalt nanowires was studied. Indium impurities with different amounts were added to iron-cobalt nanowires by varying the concentrations of indium ions in the electrocoagulation solution. The results showed that the coercivity of iron-cobalt nanowires was reduced by adding indium impurity as a nonmagnetic material from 1854 Oe to 801 Oe by adding 0.05M In-ions in the electrochemical bath during electrodeposition. The crystalline structure of the nanowires was concentration dependent and change of bcc structure of CoFe to amorphous and then cubic structure of Indium. The broadening of the spectrum along the Hc axis of FORC analysis shows that the magnetization reversal in the domains of nanowires is diverse and the interaction between of the adjacent nanowires in the template is low.