Navegando por Autor "Pedrosa, S. S."
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Artigo High-energy product SmCo5@Fe core-shell nanoparticles(American Physical Society, 2018-04-16) Carriço, Arthur da Silva; Dantas, Ana Lucia; Oliveira, L. L.; Pedrosa, S. S.; Rebouças, G. O. G.; Silva, R. B.; Araújo, José Humberto deWe report a theoretical study of core-shell dipolar interaction effects on the energy product of hard/soft SmCo5@Fe core-shell spherical nanoparticles. We show that the impact of the core-shell dipolar interaction on the shell reversal process is tunable by the values of the core diameter and shell thickness. Maximum energy product optimization requires small core diameters, and the energy product enhancement may reach more than 370% for small core diameters SmCo5@Fe core-shell nanoparticlesArtigo Impact of core-shell dipolar interaction on magnetic phases of spherical core-shell nanoparticles(American Physical Society, 2015-08-26) Carriço, Artur da Silva; Medeiros Filho, F. C.; Oliveira, L. L.; Pedrosa, S. S.; Rebouças, G. O. G.; Dantas, Ana L.We show that confinement in small volumes affects the interplay of exchange and dipolar interactions and the magnetic phases of hard and soft spherical core-shell nanoparticles. Large variations in the magnetization of thin shells may occur due to the core dipolar field gradient within the shell. The reversal field is tunable by the trends imposed by the dipolar and core-shell interface exchange energies. We show, for instance, that the reversal field of a CoFe2O4 (30 nm)@ MnFe 2O4 (6 nm) particle ranges from 15.5 kOe for antiferromagnetic coupling down to 2.5 kOe for ferromagnetic coupling.