title: Ferromagnetic CoPt3 nanowires: structural evolution from fcc to ordered L1(2).
abstract: This investigation demonstrates the magnetic properties and nanostructures of CoPt(3) wire arrays that were fabricated by electrodeposition using a porous alumina template. The X-ray absorption analysis clearly verified the occurrence of a phase transition in CoPt(3) nanowires. This phase transition significantly influences the magnetic properties and enhances coercivity and squareness. The phase transition of CoPt(3) nanowires was from a random alloy distribution to anisotropically ordered CoPt(3) (L1(2)). The thermally induced phase transition of CoPt(3) nanowires to ordered L1(2) CoPt(3) through a "cluster-in-cluster" intermediate state via interdiffusion processes is revealed. The mechanism exhibited by these CoPt(3) nanowires is proposed to explain the strong correlation between their magnetic character and their atomic distribution.
authors.affiliation: Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Hao Ming
authors.initials: HM
authors.lastname: Chen
authors.forename: Chia Fen
authors.initials: CF
authors.lastname: Hsin
authors.forename: Po Yuan
authors.initials: PY
authors.lastname: Chen
authors.forename: Ru-Shi
authors.initials: RS
authors.lastname: Liu
authors.forename: Shu-Fen
authors.initials: SF
authors.lastname: Hu
authors.forename: Chao-Yuan
authors.initials: CY
authors.lastname: Huang
authors.forename: Jyh-Fu
authors.initials: JF
authors.lastname: Lee
authors.forename: Ling-Yun
authors.initials: LY
authors.lastname: Jang
mesh_terms: D000497:Alloys / Q000737:chemistry*; D005583:Fourier Analysis; D008280:Magnetics; D008855:Microscopy, Electron, Scanning; D053770:Nanowires; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; C477450:cobalt platinum alloy