Microstructure and magnetic properties in arrays of ac electrodeposited Fe_χNi_(1-χ) nanowires induced by the continuous and pulse electrodeposition

摘要

FeNi nanowires were fabricated by ac and pulse electrodeposition into the alumina template matrix. The ef-fects of continuous ac electrodeposition as well as pulse features on the structure and magnetic properties of the nanowire arrays were studied. The microstructures and mag-netic properties of the Fe_χNi_(1-χ) nanowires are seen to be in-dependent of the deposition frequency and off-time between the pulses. The ac electrodeposited Ni nanowires were not formed at more than 400 Hz deposition frequency, while the Fe_χNi_(1-χ) nanowires, containing a small amount of Fe, formed in the all frequencies. For x less than 50% the coer-civity slowly increases but over 50% Fe added to the FeNi alloy increases the coercivity with a higher rate and maxi-mum coercivity was seen for the Fe_(0.97)Ni_(0.03). The Fe and Fe_χNi_(1-χ) nanowires containing less than 30 at.% Ni was seen to have a bcc structures with (110) preferential direc-tion while Fe_χNi_(1-χ) nanowires with more than 30 at.% Ni showed (110) bcc (Fe) and/or (111) bcc (FeNi) plus (111) fcc (Ni). A preferential (111) fcc structure was obtained for the Ni nanowires.