Fe_(0.68)Ni_(0.32)合金纳米线阵列的磁性行为  

Magnetic behavior of Fe_(0.68)Ni_(0.32) alloy nanowire array

作　　者：刘青芳[1] 王建波[1] 高存绪[1] 薛德胜[1] 李发伸[1] 

机构地区：[1]兰州大学磁学与磁性材料教育部重点实验室,甘肃兰州730000

出　　处：《兰州大学学报（自然科学版）》2004年第6期31-33,共3页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金(10404011)兰州大学引进人才启动基金资助项目.

摘　　要：　　采用电化学沉积方法,在多孔的三氧化二铝模板中,制备出直径约80 nm的Fe0.68Ni0.32合金纳米线阵列,X射线衍射结果表明,其结构为bcc,且沿着[110]方向有织构.转角度的磁滞回线表明,易轴沿着纳米线的长轴,矫顽力和剩磁比均随着外场与线轴的夹角的减小而减小,在θ=0°时达到最小.用穆斯堡尔谱对样品中磁矩进行了统计,1套谱拟合的结果显示,样品中存在一定程度的磁性织构,进一步2套谱拟合的结果表明,53％的磁矩沿着线轴方向排列,47％的磁矩成混乱分布,这导致了沿线方向矫顽力,剩磁的降低.Fe0.68Ni0.32 alloy nanowire array, with 80 nm in diameter, was successfully fabricated by an electrochemical-deposition method into the porous alumina templates. The X-ray diffraction results indicate that the sample is stabilized in bcc structure with a [110] texture oriented along the axes of nanowires. The hysteresis loops in different directions of applied field show that the easy magnetization axis is along the long axis of nanowires. The angle θ, between the applied field and the long axis of nanowires and with dependence upon coercivity and squareness, indicates that these two parameters increase with the increasing θ, and the minimum can be reached at θ=0°. The Mossbauer spectra show that the magnetic texture could be found in the sample. The fitting results show that 53% of the magnetic moments parallel to the long axis, and the residual 47% are distributed randomly, which may result in the decrease of coercivity and squareness withθ=0°.

关 键 词：纳米线阵列 磁性 穆斯堡尔谱 

分 类 号：O482.5[理学—固体物理]