模板法制备DyCoxZnyOz纳米管阵列及磁性研究

Synthesis of DyCoxZnyOz Nanotube Arrays in AAM and Performance of Magnetism

采用减压抽滤法在多孔阳极氧化铝模板（AAM）纳米孔道中构筑DyCo_xZn_yO_z纳米管阵列,采用扫描电镜（SEM）和透射电镜（TEM）观察DyCo_xZn_yO_z纳米管阵列和单根纳米管形貌,用选区电子衍射（SAED）、X-射线衍射（XRD）及能量色散谱（EDS）表征纳米管的结构和元素组成,结果表明,DyCoxZnyOz纳米管为非晶态结构,纳米管元素组成的原子百分比Dy：Co：Zn：O为4.86：1.67：1.70：91.77,质量百分比Dy：Co：Zn：O为32：4.42：4.07：59.51。以振动样品磁强计（VSM）研究了DyCo_xZn_yO_z纳米管阵列磁性能,实验结果表明,DyCo_xZn_yO_z纳米管阵列易磁化方向为垂直于纳米管阵列方向,磁各向异性源于形状各向异性,DyCo_xZn_yO_z纳米管阵列具备软磁体特征。

DyCoxZnyOz nanotube arrays have been fabricated in an anodic alumina membrane （AAM） by filtering at subatmospheric. The images of DyCoxZnyOz nanotube arrays and single nanotube arc observed by scanning electron microscope （SEM） and transmission electron microscope （TEM）, respectively. Selected area electron diffraction （SAED）, X-ray diffraction （XRD） and energy dispersive spectra （EDS） are employed to study the morphology and chemical composition of the nanotubes. The results indicate that the DyCoxZnyOz nanotube is amorphous,and the ratio of atomic percentage of DyCoxZnyOz is 4.86：1.67：1.70：91.77, and the ratio of mass percentage of Dy：Co：Zn：Ois32：4.42：4.07：59.51. The hysteresis loops characterized by a vibrating .sample magnetometer （VSM） indicated that the easily magnetized direction of DyCoxZnyOz is perpendicular to the nanotube arrays and that there exhibits magnetic anisotropy as a result of the shape anisotropy. DyCoxZnyOz nanotube arrays possess soft magnetic characteristics.