The effects of electrodeposition voltage and electrodeposition waveform on magnetic properties of cobalt nanowire arrays deposited in anodized aluminum oxide (AAO) template

High density cobalt (Co) nanowires were prepared by AC electrodeposition in porous Anodized Aluminium Oxide (AAO) as template. The as-obtained nanowires have a diameter of about 40 nm. The electrodeposition potential was (20-30 Vpp) in sine, triangle and square waveforms and electrodeposition was carried at 550 Hz. The electrodeposition current wave is not the same as electrodeposition voltage waveform and has different shape in positive and negative of half cycle. During the cathodic half cycle electordeposition of Co nanowire in AAO template occurs. By increasing cathodic potential electrons tunnel in thin barrier layer oxide (10nm thickness) and electrodeposition accrue and the optimum Vpp is 30V. The magnetic properties of Co nanowires measured by AGFM show obvious magnetic anisotropy that dominated by shape anisotropy.

Keywords:

Magnetic nanowire , Anodized Aluminium Oxide , Coercivity , Squareness