Itinerant Helimagnetic Single-Crystalline MnSi Nanowires

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• 作者：Kwanyong Seo ; Hana Yoon ; Seong-Wan Ryu ; Sunghun Lee ; Younghun Jo ; Myung-Hwa Jung ; Jinhee Kim ; Yang-Kyu Choi ; Bongsoo Kim
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：May 25, 2010
• 年：2010
• 卷：4
• 期：5
• 页码：2569-2576
• 全文大小：528K
• 年卷期：0
• ISSN：1936-086X

文摘

We report the synthesis of free-standing MnSi nanowires via a vapor transport method with no catalyst and measurements of their electrical and magnetic properties for the first time. The single-crystalline MnSi nanowire ensemble with a simple cubic (B20) crystal structure shows itinerant helimagnetic properties with a T_c of about 30 K. A single MnSi nanowire device was fabricated by a new method using photolithography and a nanomanipulator that produces good ohmic contacts. The single-nanowire device measurements provide large (20%) negative magnetoresistance and very low electrical resistivity of 544 μΩcm for the MnSi nanowire.