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: 
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