Preparation And Study On The Magenetic Properties Of CoCu Nanowires

CoCu nanowire arrays with different shapes and structures were prepared by the electrodeposition method and their magenetic properties were investigated.CoCu nanowires with different compositions and phases have been made by adjusting pH value. An apparent pH value rule for nanowires phase and composition has been found. We consider that the adjusting function of pH value is due to the influence of the pH value on the depositing rate of Co2+. CoCu nanowire arrays with hcp+fcc phase have been fabricated by adjusting the deposition parameters. Nanowires with composite phase show much higher magenetic property than those with single phase.When pH=3.3, we have made a serious of composite phase CoxCu1-x(x=0.38~0.87) nanowires by adjusting different deposition potentials. The change of the composition of nanowires shows the influence of Cu on the strcture of nanowires:with the increasing of the Cu composition, the composite phase of the CoxCu1-x can regularly chang, from the coexistence coexistence of the hcp Co and a small quantity of fcc Cu to the coexistence coexistence of three different phases , hcp Co,fcc CoCu alloy and fcc Cu,and the proportions of the different phases can also regularly change with the increasing of the Cu composition. We found the optimal composition of coercivity and squareness respectively appeared at Co60Cu40 and Co75Cu25.The CoCu nanowire arrays with bunchiness and ring shape have been fabricated by adjusting the deposition parameters.The results indicate that they respectively show a single hcp and fcc structure. Magnetic measurement reveals that they respectively show a much higher coercivity and squareness which normal structures and topographys nanowires can not reach.The angle dependence of the coercivity indicateds that the magnetization reversal mechanism of these different structures and topographys nanowires are different. The results of the coercivity which is calculated by respective magnetization reversal model further prove the consistency of the modle and experimental results.