非晶Fe_(89.7)P_(10.3)合金纳米线阵列的磁性研究  

Magnetic properties of amorphous Fe_(89.7)P_(10.3) alloy nanowire arrays

作　　者：史慧刚[1] 付军丽[1] 薛德胜[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,兰州730000

出　　处：《物理学报》2005年第8期3862-3866,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10374038;50171032)资助的课题.~~

摘　　要：利用电化学沉积方法在阳极氧化铝模板中制备了Fe89·7P10·3非晶合金纳米线阵列.利用x射线衍射仪、透射电子显微镜、振动样品磁强计和穆斯堡尔谱仪研究了样品的结构和磁性,发现纳米线阵列是非晶结构,且拥有垂直磁各向异性和高的矫顽力,Hc=3·04×104A/m.纳米线内部的平均超精细场和平均同质异能移分别为2·15×106A/m和0·07mm/s;而纳米线末端的平均超精细场(2·33×106A/m)大于内部的值,平均同质异能移(0·04mm/s)小于内部的值.另外,纳米线内部Fe原子磁矩与线轴的夹角约为16°,而在纳米线末端Fe原子磁矩与线轴的夹角约为28°.这些结果表明,由于形状各向异性,在纳米线中实现了无序非晶合金磁矩的有序排列.Amorphous Fe89.7P10.3 alloy nanowire arrays were fabricated in an anodic aluminum oxide template by means of electrodeposition. X-ray diffraction, transmission electron microscopy, vibrating sample magnetometer and Mossbauer spectrometer are employed to study the structure and magnetic properties of the nanowire arrays. The results show that the nanowire arrays are amorphous with a perpendicular magnetic anisotropy and high coercivity H-c = 3.04 x 10(4) A/m. The mean hyperfine field and the mean isomer shift of the inside of nanowires are - 2.15 x 10(6) A/m and 0.07 mints, respectively. The mean hyperfine field (2.33 x 10(6) A/m) at the end of nanowires is higher than that of the inside of nanowires, but the mean isomer shift (0.04 mm/s) at the end of nanowires is smaller than that of the inside of nanowires. The average angle between the Fe magentic moment and the wire axis is 16 degrees in the the inside of nanowires, but the average angle is at the end of nanowires. Due to the shape anisotropy of nanowires, the ordered alignment of magnetic moments is realized in the disordered amorphous alloy system.

关 键 词：金纳米线阵列 磁性研究 阳极氧化铝模板 透射电子显微镜 振动样品磁强计 垂直磁各向异性 同质异能移 穆斯堡尔谱仪 形状各向异性 超精细场 原子磁矩 沉积方法 非晶结构 有序排列 非晶合金 平均 内部 电化学 衍射仪 矫顽力 

分 类 号：TB383[一般工业技术—材料科学与工程]