title: Itinerant helimagnetic single-crystalline MnSi nanowires.
abstract: 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 microOmegacm for the MnSi nanowire.
authors.affiliation: Department of Chemistry, KAIST, Daejeon 305-701, Korea.
authors.forename: Kwanyong
authors.initials: K
authors.lastname: Seo
authors.forename: Hana
authors.initials: H
authors.lastname: Yoon
authors.forename: Seong-Wan
authors.initials: SW
authors.lastname: Ryu
authors.forename: Sunghun
authors.initials: S
authors.lastname: Lee
authors.forename: Younghun
authors.initials: Y
authors.lastname: Jo
authors.forename: Myung-Hwa
authors.initials: MH
authors.lastname: Jung
authors.forename: Jinhee
authors.initials: J
authors.lastname: Kim
authors.forename: Yang-Kyu
authors.initials: YK
authors.lastname: Choi
authors.forename: Bongsoo
authors.initials: B
authors.lastname: Kim