Figure 7

Magnetization reversal of squares in the lattice with a = 25 μm (sample B2), corresponding to the transition 2 → 1 for lattice patterned with (a) D* = 1 × 1015He+/cm2 and (b) D** = 3 × 1015He+/cm2.

Magnetization reversal of squares in the lattice with a = 25 μm (sample B2), corresponding to the transition 2 → 1 for lattice patterned with (a) D* = 1 × 1015He+/cm2 and (b) D** = 3 × 1015He+/cm2.