INVESTIGADORES
ZYSLER Roberto Daniel
artículos
Título:
Evolution of the magnetic anisotropy with particle size in antiferromagnetic Cr2O3 nanoparticles
Autor/es:
D. TOBIA; E. DE BIASI; M. GRANADA; H.E. TROIANI; G. ZAMPIERI; E. WINKLER; R.D. ZYSLER
Revista:
JOURNAL OF APPLIED PHYSICS
Editorial:
AMER INST PHYSICS
Referencias:
Año: 2010 vol. 108 p. 104303 - 104303
ISSN:
0021-8979
Resumen:
We report the magnetic properties of antiferromagnetic Cr2O3 from bulk material down to 6 nm nanoparticles. We have found a decrease in the lattice parameters and the cell volume when the size diminishes. On the contrary, the magnetic anisotropy constant, Keff, shows a nonmonotonic behavior. The Keff decreases from its bulk value, shows a minimum near d~30 nm and displays an important increase for smaller sizes. We analyzed the size dependence of Keff in terms of the magnetocrystalline and surface contributions, and we fitted the Keffsize evolution on the basis of a phenomenological model taking into account the magnetically ordered core and the surface contribution.
