Epitaxial L10 FePt magnetic thin films sputtered on Cu (001)

Epitaxial Fe50Pt50 (30 nm) magnetic thin films were sputter-deposited on Cu (001) single crystal substrate. The fct L10 ordered FePt (200)〈001〉∥Cu (002)〈100〉 epitaxial relationship was observed using high-resolution x-ray scattering. The L10 ordered FePt film sputtered at 400 °C with well-controlled easy-axis distribution (full width at half-maximum=2.36°), small grain size (10 nm), and high in-plane coercivity (4.4 kOe) is a potential candidate for ultrahigh-density longitudinal magnetic recording media.