Ni纳米线阵列的铁磁共振研究

通过改变氧化电压和酸性溶液制备了孔径、孔隙率不同的阳极氧化铝模板，用电沉积方法在模板中制备了Ni有序纳米线阵列，并用铁磁共振技术和振动样品磁强计对其进行了研究.研究表明Ni纳米线阵列存在着较强的偶极相互作用，偶极相互作用与纳米线的形状各向异性之间的竞争决定了纳米线的易磁化方向.随着纳米线阵列密度的增加，线间的偶极相互作用增加，使得纳米线易磁化方向从平行于纳米线方向渐趋向于垂直于纳米线的平面内.关键词：纳米线铁磁共振偶极相互作用氧化铝模板

Ferromagnetic resonance study of Ni nanowire arrays

Arrays of Ni nanowires were electrodeposited into anodic alumina oxide templates with various pore diameters and porosity. The magnetization behavior of the Ni nanowire arrays was investigated with ferromagnetic resonance techniques and the vibrating sample magnetometer. Both ferromagnetic resonance spectra and hysteresis loops show that there is a strong dipolar interaction between the nanowires. The easy axis of magnetization is mainly a result of a competition of shape anisotropy and dipolar interaction. With increasing array density, the dipolar interactions increase and the easy axis is tuned from parallel to perpendicular to the wire axis.