α-Fe纳米线阵列膜磁各向异性的穆斯堡尔谱研究  

M?SSBAUER SPECTRUM STUDIES OF MAGNETIC ANISOTROPY OF α\|Fe NANOWIRE ARRAYS IN ALUMINA TEMPLATE 

作　　者：王成伟[1] 彭勇[1] 潘善林[1] 张浩力[1] 力虎林[1] 

机构地区：[1]兰州大学化学系,兰州730000

出　　处：《物理学报》1999年第11期2146-2150,共5页Acta Physica Sinica

基　　金：国家自然科学基金

摘　　要：在具有纳米级孔洞的多孔氧化铝模板上，用电沉积方法成功地制备出α Ｆｅ 纳米线有序阵列组装膜．分别用透射电子显微镜（ Ｔ Ｅ Ｍ） 、穆斯堡尔谱仪（ Ｍ Ｓ） 和振动样品磁强计（ Ｖ Ｍ Ｓ）对样品进行了测试分析． Ｔ Ｅ Ｍ 和电子衍射的结果显示，阵列中的纳米线均匀有序，彼此独立，由一串α Ｆｅ 单晶磁性颗粒构成． Ｖ Ｓ Ｍ 测试结果表明，这种纳米阵列结构具有高度垂直磁各向异性．当外磁场垂直磁化时，磁滞回线具有很高矩形比（０９８） 和矫顽力（１７６ ×１０５ Ａ／ ｍ） ．尤其 Ｍ Ｓ 的测试结果显示，阵列中的每根纳米线的总磁矩都沿其轴线高度取向，垂直于膜面，其饱和磁化强度接近其块材的值（０１７ Ｔ） ．A new kind of Fe nanowire array was successfully prepared by electrochemical deposition in nanoporous anodic aluminum oxide(AAO)template.Its micrography and crystalloid structure was investigated by transmission electron microscopy and electron diffraction.The results indicated that the nanowires in the array are very uniform and well isolated,and parallel to each other.Each nanowire appeared as a chain of peanuts,and the particle in this chain was proposed to be a single crystal of α\|Fe. Its magnetic anisotropy was characterized by using Vibrating Sample Magnetometer(VSM) and Mssbauer spectrum(MS).The VSM results clearly revealed that the α\|Fe nanowire array in the alumite shows a strong perpendicular magnetic anisotropy with the easy direction normal to the alumite.And the perpendicular hysteresis loops curve has high squareness (0\^98) and coercive force (1\^76×10\+5?A/m).The MS proved that the moment of each nanowire in AAO template is highly orientated along its axis and perpendicular to the surface of the membrane.The saturation magnetization ( M \-s)of the nanowire array is similar to that of the bulk materials(0\^17?T). PACC: 7560; 7570K; 8115L

关 键 词：穆斯堡尔谱 磁各向异性 Α-FE 纳米线阵列 薄膜 

分 类 号：O484.43[理学—固体物理] O482.5[理学—物理]