Role of the dipolar interaction on the macroscopic state of magnetic nanoparticle systems: a Monte Carlo study.
J Nanosci Nanotechnol
; 10(4): 2717-21, 2010 Apr.
Article
en En
| MEDLINE
| ID: mdl-20355490
ABSTRACT
We have performed Monte Carlo simulations to treat the effect of the dipolar interaction in assemblies of superparamagnetic nanoparticles. Our simulations reproduce correctly the increase of the blocking temperature (T(B)) as the concentration increases, as observed experimentally. Interestingly, we have observed a progressive displacement of the M2 versus H/M isotherms (Arrott plots) from the origin as the concentration of nanoparticles increases. Moreover, the curvature of the isotherms at T > T(B) changes from positive to negative slope at high sample concentrations, resembling the shape of a first order phase transition. These results are surprisingly similar to that found in a conventional magnetic phase transition under the effect of a random anisotropy or a random field.
Buscar en Google
Banco de datos:
MEDLINE
Idioma:
En
Revista:
J Nanosci Nanotechnol
Año:
2010
Tipo del documento:
Article
País de afiliación:
España