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首页> 外文期刊>Nanotechnology >Superparamagnetic and ferromagnetic Ni nanorod arrays fabricated on Si substrates using electroless deposition
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Superparamagnetic and ferromagnetic Ni nanorod arrays fabricated on Si substrates using electroless deposition

机译：使用化学沉积在Si衬底上制造的超顺磁性和铁磁性Ni纳米棒阵列

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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.
机译：研究了使用阳极氧化铝模板和化学沉积法制备的镍纳米棒的微观结构和磁性。发现所沉积的纳米棒包含平均尺寸类似于2-3nm的纳米晶粒。与温度有关的磁滞曲线表明，由于铁磁微晶的还原，所沉积的棒的超顺磁行为。当在400摄氏度下退火时，超顺磁性（SM）镍纳米棒转变为铁磁性（FM）棒。暗场透射电子显微镜的结果表明，棒的微观结构趋于形成层状结构，且晶粒生长平行于长轴棒，以及沿相同方向的铁磁排序的增强。结果表明，获得的SM-FM相变是微观结构驱动的。通过无电沉积生产的Ni纳米棒还具有用作纳米级器件（例如高频电感器）中磁性构建基块的潜力。使用这些纳米棒制造了片上磁性螺旋电感器，并且证明了纳米棒可以提高高达6 GHz的电感。

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