Abstract
Numerous attempts have been made to search for large magnetic anisotropy and coercivity in all ferrous metal materials, but our capability to realize metastable tetragonal ferrous nanostructures is still limited. Here we present a rational epitaxial core/shell design to stabilize tetragonal iron–nickel (FeNi) nanostructures to reveal substantial coercivity and anisotropy. Phase transformation of gold–copper (AuCu) cores induced a surface stress that efficiently triggers a tetragonal reconstruction of FeNi shell within a critical thickness range. A tunable magnetic performance is dictated by the chemical composition and thickness of FeNi shell, as well as a plasmon effect from the AuCu core. Rapid progress in epitaxial core/shell growth and phase transformation opens up exciting opportunities to stabilize unusual nanostructures and develop high performance multifunctional nanomaterials.
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