Abstract
Hexagonal close-packed Co nanowire arrays in anodic aluminum oxide template with the diameter of 50 nm have been fabricated using an ac electrodeposition method. The effect of magnetic field annealing on the thermal stability and magnetic properties of these nanwire arrays was studied. XRD measurements indicate the increase of diffraction intensity with the increase of heat-treatment temperature without magnetic field. Furthermore, the intensity of diffraction peak decreases rapidly if the sample undergoes the magnetic field annealing. Influence of different annealing process on the magnetic properties of Co nanowire arrays has also been studied. It is found that the magnetocrystalline anisotropy of hcp Co becomes weaker after magnetic field annealing, which lead to increase of the total anisotropy of Co nanowire arrays.
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