Design and Micromagnetic Simulation of Fe/L1₀-FePt/Fe Trilayer for Exchange Coupled Composite Bit Patterned Media at Ultrahigh Areal Density

Figure 4

Hysteresis loops of ECC-BPM bilayer with and of 10 pJ/m (solid line), trilayer 1 with and of 10 pJ/m (dotted line), and trilayer 2 with of 10 pJ/m and without (dashed line). Magnetization reversal process of single dot in bilayer: (a) and (d), trilayer 1: (b) and (e), and trilayer 2: (c) and (f). Magnetization reversal of (a)–(c) without and (d)–(f) at of −18 kOe.