Strong Facet-Induced and Light-Controlled Room-Temperature Ferromagnetism in Semiconducting 尾-FeSi2 Nanocubes

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• 作者：Zhiqiang He ; Shijie Xiong ; Shuyi Wu ; Xiaobin Zhu ; Ming Meng ; Xinglong Wu
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：September 9, 2015
• 年：2015
• 卷：137
• 期：35
• 页码：11419-11424
• 全文大小：471K
• ISSN：1520-5126

文摘

Crystalline 尾-FeSi₂ nanocubes with two {100} facets and four {011} lateral facets synthesized by spontaneous one-step chemical vapor deposition exhibit strong room-temperature ferromagnetism with saturation magnetization of 15 emu/g. The room-temperature ferromagnetism is observed from the 尾-FeSi₂ nanocubes larger than 150 nm with both the {100} and {011} facets. The ferromagnetism is tentatively explained with a simplified model including both the itinerant electrons in surface states and the local moments on Fe atoms near the surfaces. The work demonstrates the transformation from a nonmagnetic semiconductor to a magnetic one by exposing specific facets and the room-temperature ferromagnetism can be manipulated under light irradiation. The semiconducting 尾-FeSi₂ nanocubes may have large potential in silicon-based spintronic applications.