Abstract
We fabricated highly ordered patterned Permalloy nanometric structures by means of ion beam sputtering on top of an anodic aluminium oxide nanoporous template. First-order reversal curve (FORC) results and micromagnetic simulations indicate the presence of Permalloy inside one side of the pores, leading to a nanopillar array anisotropically arranged combined with an antidot array. The strong shape anisotropy of the pillar forces it to maintain the magnetization along its axis, even for a large in-plane applied field. This phenomenon induces out-of-plane hysteresis, as well as in-plane anisotropic behaviour. Depending on the in-plane applied field direction, the presence of nanopillars differently modifies the regular domain pattern, and therefore they could act as a new parameter for tailoring of magnetic anisotropy in antidot arrays.
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