High-quality, epitaxial CoPtx alloy films were prepared on Mo(211) seeding layer on A12O3 (1-100) substrate at growth temperature of ∼ 400°C. A new FCC (311) orientation with modest perpendicular magnetic anisotropy is established for large Pt/Co composition ratio x (2 < x < 3). With decreasing of x to about 1.1-1.5, an ordered L11-like phase together with a weaker HCP (1-100) peak was observed by X-ray diffraction. The development of the L11 phase in turn results in an enhancement of perpendicular coercivity and squareness of the Kerr rotation loop. Annealing at high-temperature (650°C) results in a structure change and deterioration of the perpendicular magnetic anisotropy.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics