Stoichiometry-anisotropy connections in epitaxial L1 ₀ FePt(001) films

Abstract

The characterization of the order parameters and anisotropy constants of a series of epitaxial L1 0 FePt films with compositions in the range of 45-55 at.% Fe and nominal thicknesses of 50 nm was analyzed. By cosputtering the elements onto single crystal MgO(001) substrates, the films were made. The substrates were coated with 1 nm Pt/1 nm Fe bilayer seeds prior to alloy deposition and both the bilayer seed and the alloy film were deposited at 620 °C. It was shown that the order parameter had a maximum for the film composition closest to the equiatomic composition.