Configurational anisotropy in square lattices of interacting cobalt dots

Magnetostatic coupling effects are investigated in square lattices of polycrystalline circular Co dots as a function of dot diameter, spacing, and thickness. We observe a quadratic anisotropy for closely spaced dots when the dot thickness exceeds 15 nm, correlated to a change in the magnetization re...

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Bibliographic Details
Published in:Journal of applied physics 2002-05, Vol.91 (10), p.7041-7043
Main Authors: Natali, M., Lebib, A., Chen, Y., Prejbeanu, I. L., Ounadjela, K.
Format: Article
Language:English
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Summary:Magnetostatic coupling effects are investigated in square lattices of polycrystalline circular Co dots as a function of dot diameter, spacing, and thickness. We observe a quadratic anisotropy for closely spaced dots when the dot thickness exceeds 15 nm, correlated to a change in the magnetization reversal process from coherent rotation to vortex nucleation/annihilation. To understand the observed anisotropy micromagnetic simulations have been performed which show that vortex nucleation is strongly dependent on the micromagnetic configurations.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1447176