Open AccessImpact of core-shell dipolar interaction on magnetic phases of spherical core-shell nanoparticles
Author(s) -
F. C. Medeiros Filho,
L. L. Oliveira,
Sílvia Santos Pedrosa,
G. O. G. Rebouças,
A. S. Carriço,
Ana L. Dantas
Publication year - 2015
Publication title -
physical review b
Language(s) - English
Resource type - Journals
eISSN - 1538-4489
pISSN - 1098-0121
DOI - 10.1103/physrevb.92.064422
Subject(s) - shell (structure) , condensed matter physics , dipole , magnetic dipole–dipole interaction , materials science , coupling (piping) , core (optical fiber) , ferromagnetism , antiferromagnetism , magnetization , nanoparticle , field (mathematics) , exchange interaction , particle (ecology) , magnetic field , physics , nanotechnology , quantum mechanics , composite material , oceanography , mathematics , geology , pure mathematics , metallurgy
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)@MnFe2O4(6 nm) particle ranges from 15.5 kOe for antiferromagnetic coupling down to 2.5 kOe for ferromagnetic coupling.
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