Co-Ni合金纳米线有序阵列的制备与磁性研究  

PREPARATION AND MAGNETIC RESEACH OF Co-Ni ALLOY NANOWIRES ARRAY

作　　者：覃东欢[1] 彭勇[2] 王成伟[1] 力虎林[1,3] 

机构地区：[1]兰州大学化学系 [2]兰州大学国家教育部应用磁学开放实验室 [3]兰州大学国家教育部应用磁学开放实验室,兰州730000

出　　处：《物理学报》2001年第1期144-148,共5页Acta Physica Sinica

基　　金：国家自然科学基金!(批准号 :6 9890 2 2 0 )资助的课题 .&&

摘　　要：用交流电沉积方法 ,选一定比例的CoSO4 和NiSO4 混合溶液为电解质 ,在多孔阳极氧化铝 (AAO)模板的柱形微孔内成功地制备出Co Ni合金纳米线有序阵列 .分别用透射电镜 (TEM ) ,X射线衍射仪 (XRD)和振动样品磁强计 (VSM )对样品的形貌结构和磁学性质进行了表征测试 .TEM和X射线衍射的结果显示 ,阵列中合金纳米线均匀有序 ,长径比可控 (1— 10 0 ) ,纳米线中的晶粒在生长过程中有 (111)、(0 11)择优取向 .VSM测试结果表明 ,这种纳米线阵列结构具有较高的垂直磁各向异性 .当外场垂直磁化时 ,磁滞回线有较高的矩形比 (0 6— 0 9)和矫顽力(0 6 4— 0 8)× 10 5A/m .矩形比和矫顽力都比一般的二维Co Ni合金薄膜材料大得多 ,样品热处理后 ,矩形比普遍得到提高 ,均在 0 8以上 .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(0.63 x 10(5) A/m-0.8 x 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.

关 键 词：矩形比 垂直膜面各向异性 软磁材料 钴-镍合金纳米线 磁性 

分 类 号：O482[理学—固体物理]