Self-Assembled Magnetic Nanohead-FeSi Nanowire Epitaxial Heterojunctions by Chemical Vapor Deposition

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• 作者：S. Liang ; X. Fang ; Tian-Long Xia ; Yujun Qing ; Zhi-Xin Guo
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：October 7, 2010
• 年：2010
• 卷：114
• 期：39
• 页码：16187-16190
• 全文大小：267K
• 年卷期：v.114,no.39(October 7, 2010)
• ISSN：1932-7455

文摘

Self-assembled magnetic nanohead-FeSi nanowire (NW) epitaxial heterojunctions by chemical vapor deposition (CVD) are reported. Free-standing FeSi NWs, 30 nm in diameter and several micrometers long, were grown by reduction of Fe₂O₃ in a H₂ atmosphere on a heated silicon substrate at 750 °C. These NWs shows very uniform dimensions, which is thought to be due to a higher diffusion activation energy for the nanostructure. A magnetic Fe₃O₄ head with a diameter of 30 nm was observed on each FeSi NW. The epitaxial relationship of these junctions is Si[001]//Fe₃O₄[01], Si(001)//Fe₃O₄(102). Ferromagnetic behavior of the nanoheads was identified, and the coercivity was characterized as 220 Oe at 10 K. This one-step CVD approach for self-assembling epitaxially magnetic heads could enable device integration for spintronics and sensors. Particularly, such FeSi nanowires with highly localized magnetic nanoheads are ideal for high resolution magnetic force microscopy (MFM).