The Effect of Thickness on the Magnetic Anisotropy and Magnetic Properties of Single-Layered FePt Films by In Situ Annealing
The FePt films with various thicknesses of 5 to 50 nm are deposited on Si(100) substrate without any underlayer by in-situ annealing at substrate temperature (Ts) of 620°C. A strong (001) texture of L10 FePt film is obtained and presents high perpendicular magnetic anisotropy as the film thickness increases to 30 nm. Further increasing the thickness to above 30 nm, the (111) orientation of L10 FePt is enhanced greatly, indicating that the quality of perpendicular magnetic anisotropy degrades when the FePt film is thicker than 30 nm. The single-layered FePt film with thickness of 30 nm by in-situ depositing at 620°C shows good perpendicular magnetic properties (perpendicular coercivity of 14.0 kOe, saturation magnetization of 473 emu/cm3 and perpendicular squareness of 0.96, respectively), which reveal its significant potential as perpendicular magnetic recording media for high-density recording.
Joong Hee Lee
S.C. Chen et al., "The Effect of Thickness on the Magnetic Anisotropy and Magnetic Properties of Single-Layered FePt Films by In Situ Annealing", Advanced Materials Research, Vols. 123-125, pp. 507-510, 2010