Magnetostriction Measurements of L10 Fe50Pt(50–x)Pdx Thin Films

This paper reports, for the first time, the measurement of magnetostriction in Fe₅₀Pt_(50-x)Pd_x thin films with varying Pd content. L1₀-ordered FePtPd alloy films, with strong perpendicular magnetic anisotropy, are leading candidates for recording media in the next-generation hard disk drives and solid-state random access memory technologies. The magnetostrictive properties of such materials are of importance, as strain in these systems may thereby affect the magnetic anisotropy or even be intentionally applied to control the magnetic switching characteristics. The measurements performed using the cantilever bending technique indicate that the magnetostriction is dependent on the film composition, and a maximum magnetostriction of 28 ppm is found in the Fe₅₀Pt₇Pd₄₃ film. These results suggest the possibility of tailoring magnetostriction via film composition for energy-assisted data storage and synthetic multiferroic random access memory applications.