Vortex State Suppression in a Hexagonal Array of Interacting Py Triangular Rings

Abstract

We investigate the eect of magnetostatic interactions on the magnetization reversal process of equilateral triangular rings arranged on a hexagonal lattice. Inter-ring interactions originate as rings corners host domain--walls that produce an intense dipolar eld; the eect of such interactions is studied by recording hysteresis loops for dierent magnetic eld orientations. Rings magnetic conguration is probed via magnetic force microscopy and diraction magneto-optic Kerr eect measurements. We observe that the eect of stray elds due to domain-walls competes with that of shape anisotropy, and that the former prevails when the magnetic eld orientation is parallel to rings symmetry axes.