IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Determination of the blocking temperature of magnetic nanoparticles: The good, the bad and the ugly
Autor/es:
I.J. BRUVERA; P. MENDOZA ZÉLIS; M. PILAR CALATAYUD; G.F. GOYA; F.H. SÁNCHEZ
Revista:
JOURNAL OF APPLIED PHYSICS
Editorial:
AMER INST PHYSICS
Referencias:
Lugar: New York; Año: 2015 vol. 118 p. 184304 - 184312
ISSN:
0021-8979
Resumen:
A numerically solved two-level Stoner-Wohlfarth model with thermal agitation is used to simulate Zero Field Cooling (ZFC) - Field Cooling (FC) curves of monosize and polysize samples and to determine the best method for obtaining a representative blocking temperature TB value of polysize samples. The results confirm a technique based on the T derivative of the difference between ZFC and FC curves proposed by Micha et al (the good) and demonstrate its relation with two alternative methods: the ZFC maximum (the bad) and inflection point (the ugly). The derivative method is then applied to experimental data, obtaining the TB distribution of a polysize F e3 O4 nanoparticle sample suspended in hexane with an excellent agreement withTEM characterization.