Abstract
The hysteresis and anisotropy properties of permalloy antidot arrays with hexagonal symmetry are investigated in detail, focusing on the influence of the hole size, lattice packing fraction and scale factor. The analysis is performed via a micromagnetic numerical approach, where the hysteresis loops are computed by integrating the Landau–Lifshitz–Gilbert equation. We show that the ratio of the hole diameter to the centre-to-centre nearest-neighbour hole distance influences not only the remanent state and the coercive field but also the easy and hard-axis directions. Then, we put in evidence the dominant role of the local magnetostatic field in determining the anisotropy properties of the considered patterned nanostructures, analysing the magnetic domain configuration and the behaviour of the magnetostatic energy versus the applied field.
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