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Configurational anisotropy in square lattices of interacting cobalt dots

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: M. Natali, A. Lebib, Y. Chen, I. L. Prejbeanu, and K. Ounadjela

Editorial: Journal of Applied Physics, 91, p.7041-7043, 2002.


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.

Cuvinte cheie: anisotropy, dipolar interactions, dot arrays, magnetization reversal