Prida V M, Pirota K R, Navas D, Asenjo A, Hernández-Vélez M, Vázquez M
Depto. Física, Universidad de Oviedo, Calvo Sotelo s/n, 33007-Oviedo, Spain.
J Nanosci Nanotechnol. 2007 Jan;7(1):272-85.
Densely packed arrays of magnetic nanowires have been synthesized by electrodeposition filling of nanopores in alumina and titania membranes formed by self-assembling during anodization process. Emphasis is made on the control of the production parameters leading to ordering degree and lattice parameter of the array as well as nanowires diameter and length. Structural, morphological and magnetic properties exhibited by nanowire arrays have been studied for several nanowire compositions, different ordering degree and for different nanowire aspect ratios. The magnetic behaviour of nanowires array is governed by the balance between different energy contributions: shape anisotropy of individual nanowires, the magnetostatic interaction of dipolar origin among nanowires, and magnetocrystalline and magnetoelastic anisotropies induced by the pattern templates. These novel nanocomposites, based on ferromagnetic nanowires embedded in anodic nanoporous templates, are becoming promising candidates for technological applications such as functionalised arrays for magnetic sensing, ultrahigh density magnetic storage media or spin-based electronic devices.
通过在阳极氧化过程中自组装形成的氧化铝和二氧化钛膜中的纳米孔进行电沉积填充，合成了密集排列的磁性纳米线阵列。重点在于控制生产参数，这些参数会影响阵列的有序度和晶格参数，以及纳米线的直径和长度。针对几种纳米线组成、不同的有序度和不同的纳米线纵横比，研究了纳米线阵列所展现的结构、形态和磁性特性。纳米线阵列的磁行为由不同能量贡献之间的平衡所决定：单个纳米线的形状各向异性、纳米线之间偶极起源的静磁相互作用，以及图案模板诱导的磁晶和磁弹各向异性。这些基于嵌入阳极纳米多孔模板中的铁磁纳米线的新型纳米复合材料，正成为技术应用的有前途的候选材料，如用于磁传感的功能化阵列、超高密度磁存储介质或自旋基电子器件。
