Dependence of Magnetic Properties of ac Electroformed Co(P) Nanowires on Applied Voltage

摘要

We have investigated the magnetic properties of Co( P) nanowire arrays fabricated by ac electroforming into self-ordered nanosized pores in anodic aluminum oxide (AAO), prepared by anodizing the pure aluminum foil. The nanopores were found to have an average diameter of 20 um and aspect ratios of more than several hundreds. Magnetic properties of Co(P) nanowires were found to have the coercivity of more than 2.6 kOe due to the shape anisotropy and squareness(M_r/M_s) of approx 0.8. It was particularly interesting to note that Co(P) nanowires showed different crystallographic structures depending on the applied potential. Co(P) nanowire prepared at ac-10 V_(rms), exhibited better magnetic properties than one prepared at ac-11 V_(rms) due to the crystallographic structural variation.