Co纳米阵列的制备及其直径对磁性的影响

Preparation of Co Nanowire Arrays and the Effect of Diameter on Magnetic Properties

采用电化学沉积法,在氧化铝模板中制备了不同直径的Co纳米线的高度有序阵列。纳米线的结构和磁学特性分别用透射电子显微镜(TEM),扫描电子显微镜(SEM),X射线衍射(XRD)仪和振动样品磁力计(VSM)测试。结果表明,Co纳米线是以fcc和hcp结构同时存在。磁学性质研究表明,这种阵列具有较强的垂直磁各向异性。直径对纳米有序阵列磁学特性的影响研究表明,当直径超过100nm后,Co纳米线磁学性质与块体Co已经没有什么区别。

Highly ordered Co nanowires arrays with different diameters have been fabricated in the pores of a porous anodic aluminum oxide （AAO） template by the electro-deposition of magnetic material. The structure and magnetic properties were characterized by transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, X-ray diffraction （XRD） and vibrating sample magnetometer （VSM）, respectively. The results show that such nanowire arrays possess both fee and hcp structures at the same time. The magnetic properties indicate that the nanowires have excellent perpendicular anisotropy. The relation between magnetic properties and Co nanowires diameters were investigated, and shown that the magnetic properties for the Co nanowires with diameter over 100 nm are not too much different from the bulk Co.