Fe纳米线的制备及其磁性能研究

Fabrication and magnetic properties of Fe nanowire arrays

采用电化学沉积法封装阳极氧化铝（AAO）模板，制备出不同直径的Fe纳米线阵列。Fe纳米线阵列的形貌、组成、晶型、磁争性能分别通过场发射扫描电子显微镜（SEM）、X-射线能谱仪（EDS）、X-射线衍射仪（XRD）、震动样品磁强计（VSM）进行表征。结果表明：电化学沉积法可以制备出直径为33～95nm的Fe纳米线；纳米线排列有序，粗细均匀，具有明显的[110]择优取向。VSM测试结果表明纳米线的直径对其磁性能影响很大。当纳米线直径为33-40nm时，纳米线具有明显的磁各向异性，垂直模板表面的方向为易磁化方向，该方向上矫顽力达112745．4A／m以上，矩形比达0．43以上：当纳米纤维直径为75-95nm时，纳米线的磁各向异性较弱，轴向上矫顽力和矩形比也较小。

Fe nanowire arrays with different diameters were prepared by electrochemical deposition method within anodic aluminum oxide （AAO） template. The morphologies, compositions, crystal structures and magnetic properties of Fe nanowire arrays were characterized respectively by field emission scanning electron microscope （SEM）, energy-dispersive x-ray spectrometer （EDS）, X-ray diffraction （XRD） and vibrating sample magnetometer （VSM）. The results show that Fe nanowire arrays with diameters of 33-95 nm can be prepared by electrochemical deposition method. Nanowire arrays with uniform diameters are arranged orderly and have obvious preferred orientation of [110]. The VSM measurements results show that diameter of the nanowires have a great influence on magnetic property. Fe nanowires with the diameter of 33-40 nm have obvious magnetic anisotropy and easy magnetization direction which is perpendicular to the sample plane with coercivity of above 112 745.4 A/m and squareness ratio of above 0.43 in this direction; Fe nanowires with the diameter of 33 -40 nm have poor magnetic anisotropy and coercivity and squareness ratio are low.