L1₀-ordered FeNi film grown on Cu-Ni binary buffer layer

An FeNi film with a metastable L1₀-ordered phase was fabricated by an alternate monatomic layer deposition. An Fe monolayer and a Ni monolayer were alternately grown on a Cu_0.6Ni_0.4 binary buffer layer. A (001) L1₀-FeNi superlattice peak, which indicates the formation of a L1₀ phase, was clearly observed by an X-ray diffraction. A long-range order parameter S of L1₀-FeNi was estimated to be 0.5 ± 0.1. It was found that the film has a uniaxial magnetic anisotropy along c-axis by magnetization measurement. The uniaxial magnetic anisotropy energy Ku was evaluated to be (5.0 ± 0.1) × 10⁶ erg/cc.