1. Shape-dependent magnetic properties of gradient-diameter Co nanowire arrays
- Author
-
John Q. Xiao, Xinyue Hu, Zhili Zuo, Hui Min Wen, Jing Wang, W.A. Muhammad, Y. F. Li, and Jun Hu
- Subjects
010302 applied physics ,Materials science ,Condensed matter physics ,Anodizing ,Exchange interaction ,Nanowire ,Physics::Optics ,02 engineering and technology ,Coercivity ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Magnetocrystalline anisotropy ,01 natural sciences ,Electronic, Optical and Magnetic Materials ,Condensed Matter::Materials Science ,Magnetization ,Dipole ,0103 physical sciences ,0210 nano-technology ,Saturation (magnetic) - Abstract
Magnetic nanowire arrays grown in anodized alumina templates offer a fertile ground to investigate the interplay among the exchange interaction, dipolar interaction, and magnetocrystalline anisotropy. In this study, we have successfully fabricated Co nanowire arrays with gradient diameter while maintaining the nanowire separation. Consequently, we are able to obtain nanowire arrays with dominant exchange interaction at one end with small nanowire dimeter and dominant dipolar interaction at the other with large nanowire diameter. These samples show very different magnetic properties from those observed in magnetic nanowire arrays with uniformly diameter. The easy magnetization axis, coercivity, saturation field, and reversal processes are all controlled collectively by both ends of the nanowires, which cannot be viewed as the combination of magnetic nanowire arrays with thin and thick diameters.
- Published
- 2019