The Effect of the Cu Concentration on the Magnetic Properties and Microstructure of the Electrodeposited CoCu Nanowires

Perpendicular magnetic recording system is one of the most promising candidates to realize the extremely high-density recording (HDR) due to its superior thermal stability and high track density [1]. One such technology to prepare sample with high perpendicular magnetic anisotropy is based on nanowires. Different techniques have been employed to fabricate nanowires . Among them, the template method has proved to be a simple and versatile approach. Electrodepositing the magnetic metal wires with nanoscale into the porous anodic aluminum oxide (AAO)templates have been utilized previously by many groups to prepare the one-dimensional nanostructure[2]. Recently, ferromagnetic-nonmagnetic alloy systems have attracted much interest[3]. Examples of such nanostructures are magnetic Co/Cu multilayers exhibiting giant magnetoresistance (GMR)[4] . A coercivity of 278, 244 and 238 Oe is reported for Co0.77Cu0.23 nanowires with 20, 30 and 40 nm, diameter, respectively [5]. In the present work, we fabricated CoCu nanowires by pulse electrodeposition of ions into PAO templates, using different composition. The magnetic properties and microstructures of composition have been investigated.