Gradient magnetic binary alloy nanowire

CoNi gradient binary-alloy nanowires are prepared in porous anodic aluminum oxide (AAO) template via electrodeposition. The coercivity and remanence of the nanowires are of high anisotropy due to the axial deposition of the magnetic compositions. The magnetocrystalline anisotropy and crystalline structure of the nanowires show dependence on the treatment of the annealing process that may reduce the anisotropy and improve the squareness. The difference in intensity of the effective anisotropic field with easy magnetization direction along the wire axis is responsible for different variation of the magnetic properties which is dominated by the competition between shape anisotropy and magnetocrystalline anisotropy.