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Magnetic lateral multilayers have been fabricated on weak perpendicularmagnetic anisotropy amorphous Nd-Co films in order to perform a systematicstudy on the conditions for controlled nucleation of topological defects withintheir magnetic stripe domain pattern. A lateral thickness modulation of period$w$ is defined on the nanostructured samples that, in turn, induces a lateralmodulation of both magnetic stripe domain periods $\lambda$ and averagein-plane magnetization component $M_{inplane}$. Depending on lateral multilayerperiod and in-plane applied field, thin and thick regions switch independentlyduring in-plane magnetization reversal and domain walls are created within thein-plane magnetization configuration coupled to variable angle grain boundariesand disclinations within the magnetic stripe domain patterns. This process ismainly driven by the competition between rotatable anisotropy (that couples themagnetic stripe pattern to in-plane magnetization) and in-plane shapeanisotropy induced by the periodic thickness modulation. However, as thestructural period $w$ becomes comparable to magnetic stripe period $\lambda$,the nucleation of topological defects at the interfaces between thin and thickregions is hindered by a size effect and stripe domains in the differentthickness regions become strongly coupled.

physical review. b, condensed matter and materials physics

Controlled nucleation of topological defects in the stripe domain  patterns of Lateral multilayers with Perpendicular Magnetic Anisotropy:  competition between magnetostatic, exchange and misfit interactions