INVESTIGADORES
TROIANI Horacio Esteban
artículos
Título:
Origin of magnetic anisotropy in ZnO/CoFe2O4 and CoO/CoFe2O4 core/shell nanoparticle systems
Autor/es:
WINKLER; LIMA; TOBIA; SALETA; TROIANI; AGOSTINELLI; FIORANI; ZYSLER
Revista:
APPLIED PHYSICS LETTERS
Editorial:
AMER INST PHYSICS
Referencias:
Lugar: New York; Año: 2012 p. 2524051 - 2524054
ISSN:
0003-6951
Resumen:
ZnO-core/CoFe2O4-shell nanoparticles of 7.4 nm average size have been synthesized and their magnetic properties have been compared to those of CoO-core/CoFe2O4-shell nanoparticles with similar morphology. The coercive field values are much lower than those for CoO/CoFe2O4 nanoparticles (e.g., at 5K: Hc¼7.8 kOe for ZnO/CoFe2O4; Hc¼27.8 kOe for CoO/CoFe2O4). The nature of the coercive field values is explained by a phenomenological model for the free energy of a non-magnetic core, or an antiferromagnetic core, encapsulated by a hard ferrimagnetic shell.
