title: Free-standing and single-crystalline Fe(1-x)Mn(x)Si nanowires with room-temperature ferromagnetism and excellent magnetic response.
abstract: High-aspect-ratio Fe(1-x)Mn(x)Si nanowires with room-temperature ferromagnetism were synthesized by a chemical vapor deposition (CVD) method in one step. This is the first report of ternary silicide nanowires using magnetic Mn ions to partially replace metal sites in the host matrix. Here we report the excellent magnetic characteristics of Fe(1-x)Mn(x)Si nanowires, which exhibit strong ferromagnetism at room temperature and high magnetoresistance (MR) variation. As-synthesized Fe(1-x)Mn(x)Si nanowires show a hyperbranched morphology and a spin-disorder behavior. The strong spin interaction in Fe(1-x)Mn(x)Si nanowires, induced by the substitution of Fe sublattices for magnetic Mn ions, was revealed in the hysteresis loops. The magnetization versus magnetic field (M-H) curves of Fe(1-x)Mn(x)Si nanowires are much less sensitive to the temperature variation from 10 to 300 K than those of FeSi nanowires. Remarkably, the excellent MR performance, -41.6% at 25 K with a magnetic field of 9 T, was demonstrated in an individual Fe(0.88)Mn(0.12)Si nanowire.
authors.affiliation: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, 30013, ROC.
authors.forename: Min-Hsiu
authors.initials: MH
authors.lastname: Hung
authors.forename: Chiu-Yen
authors.initials: CY
authors.lastname: Wang
authors.forename: Jianshi
authors.initials: J
authors.lastname: Tang
authors.forename: Ching-Chun
authors.initials: CC
authors.lastname: Lin
authors.forename: Te-Chien
authors.initials: TC
authors.lastname: Hou
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Jiang
authors.forename: Kang L
authors.initials: KL
authors.lastname: Wang
authors.forename: Lih-Juann
authors.initials: LJ
authors.lastname: Chen
mesh_terms: D003460:Crystallization / Q000379:methods; D046911:Macromolecular Substances / Q000737:chemistry; D060526:Magnetic Fields; D059346:Magnets; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D008968:Molecular Conformation; D010316:Particle Size; D013499:Surface Properties; D013696:Temperature
chemical_list: D046911:Macromolecular Substances