Optical and magnetic properties of 30 and 60 nm Ni nanowires

Ni nanowire arrays of high aspect ratio with the diameters of about 30 nm and 60 nm were prepared by DC applied AC electrodeposition. We observe the different preferred orientation and various magnetic behaviors of 30 and 60 nm diameter nanowires. In addition, the coercivity H-c(parallel to), squareness S(parallel to) and the ratio H-c(parallel to)/H-c(perpendicular to) where the applied field is parallel (parallel to) and perpendicular (perpendicular to) to the long axis of nanowires increase with decreasing wire diameter. This is the first time that optical results of Ni nanowires were presented. (c) 2007 Elsevier B.V. All rights reserved.