All Zinc-Blende GaAs/(Ga,Mn)As Core鈥揝hell Nanowires with Ferromagnetic Ordering
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- 作者：Xuezhe Yu ; Hailong Wang ; Dong Pan ; Jianhua Zhao ; Jennifer Misuraca ; Stephan von Moln谩r ; Peng Xiong
- 刊名：Nano Letters
- 出版年：2013
- 出版时间：April 10, 2013
- 年：2013
- 卷：13
- 期：4
- 页码：1572-1577
- 全文大小：373K
- 年卷期：v.13,no.4(April 10, 2013)
- ISSN：1530-6992
文摘
Combining self-catalyzed vapor鈥搇iquid鈥搒olid growth of GaAs nanowires and low-temperature molecular-beam epitaxy of (Ga,Mn)As, we successfully synthesized all zinc-blende (ZB) GaAs/(Ga,Mn)As core鈥搒hell nanowires on Si(111) substrates. The ZB GaAs nanowire cores are first fabricated at high temperature by utilizing the Ga droplets as the catalyst and controlling the triple phase line nucleation, then the (Ga,Mn)As shells are epitaxially grown on the side facets of the GaAs core at low temperature. The growth window for the pure phase GaAs/(Ga,Mn)As core鈥搒hell nanowires is found to be very narrow. Both high-resolution transmission electron microscopy and scanning electron microscopy observations confirm that all-ZB GaAs/(Ga,Mn)As core鈥搒hell nanowires with smooth side surface are obtained when the Mn concentration is not more than 2% and the growth temperature is 245 掳C or below. Magnetic measurements with different applied field directions provide strong evidence for ferromagnetic ordering in the all-ZB GaAs/(Ga,Mn)As nanowires. The hybrid nanowires offer an attractive platform to explore spin transport and device concepts in fully epitaxial all-semiconductor nanospintronic structures.