AAO模板法自组装磁性纳米线阵列及其超顺磁性

高纯铝片在草酸溶液中经直流2次阳极氧化,得到多孔氧化铝(AAO)模板。通过扩孔、缩孔和脱模实现对模板的性能优化。通过交流沉积的方法,在AAO模板内自组装Fe磁性纳米线,形成Fe纳米点阵。扫描电子显微镜(SEM)和透射电子显微镜(TEM)图像分析表明,纳米线粗细均匀,长径比约为100。单根Fe纳米线的TEM衍射花样表明其具有单晶结构。振动样品磁强计(VSM)对纳米线的宏观磁性测量可知Fe纳米线的易磁化方向均沿线长轴方向,Fe的退磁场计算表明阵列中纳米线之间存在着磁相互作用减小了退磁场的作用。Fe纳米线阵列的Mossbauer谱表现出超顺磁性,可能是来源于组成纳米线的小晶粒的超顺磁性。

Self- Assembly and Superparamagnetism of Magnetic Nanowire Array in Porous Anodic Aluminum Oxide Templates

Porous anodic aluminum oxide template was prepared by using direct current anodic oxidation method in oxalic acid solution, and then it was optimized according to bearizing porous, shrinkage cavity and demoulding membranes. Iron magnetic nanowires were fabricated in Anodic Aluminum Oxide （AAO） templates by the method of alternating current （AC） electrochemical deposition. Iron nanowires were demonstrated as single crystal structure, with uniform diameter and aspect ratio of 100. Vibrating sample magnetometer （VSM） measurement revealed that the easy direction of magnetization of Iron nanowire array was parallel to the long axis of nanowire. And the magnetic in- teractions between the neighboring nanowires reduced the effect of demagnetizing field. The Mossbauer spectrum of I- ron nanowire array displayed superparamagnetie properties of crystal nanooarticles formed nanowires.