Co nanoparticles inserted into a porous carbon amorphous matrix: the role of cooling field and temperature on the exchange bias effect.
Phys Chem Chem Phys
; 13(3): 927-32, 2011 Jan 21.
Article
em En
| MEDLINE
| ID: mdl-21116550
ABSTRACT
We report unusual cooling field dependence of the exchange bias in oxide-coated cobalt nanoparticles embedded within the nanopores of a carbon matrix. The size-distribution of the nanoparticles and the exchange bias coupling observed up to about 200 K between the Co-oxide shell (â¼3-4 nm) and the ferromagnetic Co-cores (â¼4-6 nm) are the key to understand the magnetic properties of this system. The estimated values of the effective anisotropy constant and saturation magnetization obtained from the fit of the zero-field cooling and field cooling magnetization vs. temperature curves agree quite well with those of the bulk fcc-Co.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Óxidos
/
Carbono
/
Cobalto
/
Nanopartículas Metálicas
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article