Co-Ni合金纳米线有序阵列的制备与磁性研究

关键词：

PREPARATION AND MAGNETIC RESEACH OF Co-Ni ALLOY NANOWIRES ARRAY

Co-Ni alloy nanowire arrays were prepared by AC electrochemical deposition into nanoporous anodic alumina oxide(AAO) template with mixed NiSO4 and CoSO4 solution as electrolyte. The microscopy, crystalloid structure and magnetic properties of the Co-Ni alloy nanowires were investigated by transmission electron microscopy (TEM), electron diffraction and vibrating sample magnetometer (VSM) respectively. The TEM and XRD results show that the nanowires in an array are very uniform and very regular, with an aspect ratio varying from 1 to 100, which have (111) and (011) preferred orientations during growth. VSM result shows that such nanowire arrays has a strong perpenticular magnetic anisotropy, the squareness (0.6-0.9) and the coercivity(0.64×105 A/m—0.8×105 A/m) of which were very high when the magnetic field was perpendicular to the axis of the nanowire. The coercivity and the squareness were much higher than those of planar Co-Ni alloy thin films. After heat treatment, the squareness of the sample was up to 0.8.