標題: | Superparamagnetic and ferromagnetic Ni nanorod arrays fabricated on Si substrates using electroless deposition |
作者: | Liu, Chien-Min Tseng, Yuan-Chieh Chen, Chih Hsu, Ming-Chieh Chao, Tzu-Yzan Cheng, Yu-Ting 材料科學與工程學系 電子工程學系及電子研究所 Department of Materials Science and Engineering Department of Electronics Engineering and Institute of Electronics |
公開日期: | 14-十月-2009 |
摘要: | The microstructures and magnetic properties of nickel nanorods fabricated using an anodic alumina oxide template and electroless deposition were investigated. The as-deposited nanorods were found to contain nanocrystalline grains with an average size of similar to 2-3 nm. The temperature-dependent magnetic hysteresis curves indicated superparamagnetic behavior of the as-deposited rods as a result of the reduction of ferromagnetic crystallites. The superparamagnetic (SM) Ni nanorods transformed into ferromagnetic (FM) ones when annealed at 400 degrees C. Results from dark-field transmission electron microscopy reveal that the microstructure of the rods tends to form a laminar structure with grain growth parallel to the long axis of the rods, together with the enhancement of ferromagnetic ordering along the same direction. The results suggest that the SM-FM phase transition obtained is microstructure driven. The Ni nanorods manufactured by the electroless deposition also have the potential to serve as magnetic building blocks in nanoscale devices, such as high-frequency inductors. On-chip magnetic spiral inductors were fabricated using these nanorods, and it was demonstrated that the nanorods can enhance inductance up to 6 GHz. |
URI: | http://dx.doi.org/10.1088/0957-4484/20/41/415703 http://hdl.handle.net/11536/6566 |
ISSN: | 0957-4484 |
DOI: | 10.1088/0957-4484/20/41/415703 |
期刊: | NANOTECHNOLOGY |
Volume: | 20 |
Issue: | 41 |
結束頁: | |
顯示於類別: | 期刊論文 |