title: Surface-Stress-Induced Phase Transformation of Ultrathin FeCo Nanowires.
abstract: Ultrathin metal nanowires have attracted wide attention becau se oftheir unique anisotropy and surface-to-volume effects. In this study, we use ultrathin Au nanowires as the templating core to epitaxially grow magnetic iron-cobalt (FeCo) shell through metal-redox with the control on their thickness and stoichiometry. Large surface-stress-induced phase transformation in Au nanowires triggers and stabilizes metastable tetragonal FeCo nanostructure to enhance its magnetic anisotropy and coercivity. Meanwhile, under illumination, plasmon-induced hotspot in ultrathin Au nanowires enables the light-control on magnetic characteristics of FeCo shell. This study demonstrates the feasibility of surface-stress-induced phase transformation to stabilize and control metastable nanostructures for enhanced magnetic anisotropy, which is one of the key properties of functional magnetic materials.
authors.affiliation: Department of Mechanical Engineering, Temple University , Philadelphia, Pennsylvania 19122, United States.
authors.forename: Jian
authors.initials: J
authors.lastname: Shen
authors.affiliation: Department of Mechanical Engineering, Temple University , Philadelphia, Pennsylvania 19122, United States.
authors.forename: Maogang
authors.initials: M
authors.lastname: Gong
authors.affiliation: Department of Mechanical Engineering, Temple University , Philadelphia, Pennsylvania 19122, United States.
authors.forename: Qilin
authors.initials: Q
authors.lastname: Dai
authors.affiliation: Department of Mechanical Engineering, Temple University , Philadelphia, Pennsylvania 19122, United States.
authors.forename: Shenqiang
authors.initials: S
authors.lastname: Ren
keywords: FeCo; core/shell nanowires; magnetism; phase transformation