Fabrication and magnetic properties of ordered Co_(100-x)Pb_x nanowire arrays electrodeposited in AAO templates: Effects of annealing temperature and frequency

摘要

Co_xPb_(1-x) nanowire arrays within an anodic aluminum oxide (AAO) template were electrodeposited from an appropriate acetate bath by applying alternating current (ac). The effect of the Pb content on magnetic properties of nanowire arrays was investigated. By adding Pb~(2+) to an electrolyte containing Co~(2+), the coercivity field of nanowires decreased from 1508 Oe in Co_(100) to 921 Oe in Co_(92.5)Pb_(7.5) while squareness increased from 0.74 for Co nanowires to about 0.82 for Co_(92 5)Pb_(7.5) nanowire alloy sample. The effect of annealing on the magnetic properties of nanowires in the temperature range between 300 °C and 600 °C was also investigated. It was observed that the coercivity field of Co_(97.5)Pb_(2.5) nanowire increases from 1290 Oe at room temperature to 1785 Oe at 600 °C. Furthermore, the effect of electrodeposition frequency on the magnetic properties of Co_(97.5)Pb_(2.5) nanowires was studied. The coercivity was enhanced with increasing frequency; however, after annealing all samples exhibited enhanced coercivity regardless of the electrodeposition frequency.