Microstructures and magnetic properties of single-layered FePt films by in situ annealing

The single-layered FePt films with thickness of 30 nm are deposited directly on Si substrate without underlayer at substrate temperatures of 350 to 590 °C. As the substrate temperature is 350 °C, the L1₀ FePt(111) preferred orientation is presented and tended to in-plane magnetic anisotropy. However, the L1₀ FePt(001) texture is obtained and exhibited perpendicular magnetic anisotropy as the substrate temperature is increased to 470 °C. Its perpendicular coercivity (Hc¿), saturation magnetization (Ms) and perpendicular squareness (S¿) are reached to be 6.9 kOe, 674 emu/cm³ and 0.89 respectively, which reveal its significant potential as perpendicular magnetic recording media for ultra high-density recording.