Dependence of magnetic properties on the film thickness and Pt atomic fraction of post-annealed Fe1−xPtx-C granular films on MgO(1 0 0) and SiO2/Si(1 0 0) substrates

▶ Annealing makes the L10 phase form in the Fe1−xPtx-C granular films at a proper x. ▶ The largest coercivity was obtained at x = 0.48. (3) The reversal mechanism turns from domain wall motion to S-W rotation as x increases. ▶ At x = 0.44, the coercivity increases, and magnetization decreases with increasing t. ▶ At x = 0.44, the reversal mechanism is film-thickness independent (S-W rotation mode).