The magnetic properties of NiO (3 nm) and alpha-Fe2O3 (hematite) (5 nm) nanoparticles homogeneously dispersed in a polymer matrix have been investigated. Both systems show a core-shell magnetic structure, giving rise to surface and interface effects responsible for the observed rapid increase of remanence and coercivity at low temperature. Moreover, shifted hysteresis loops were observed after field cooling (exchange bias) for alpha-Fe2O3 nanoparticles, due to the interface exchange coupling between the disordered surface magnetic structure, with multiple spin configurations, and the core "antiferromagnetically" ordered structure.

Surface effect in the magnetic order of antiferromagnetic nanoparticles

Fiorani D
2006

Abstract

The magnetic properties of NiO (3 nm) and alpha-Fe2O3 (hematite) (5 nm) nanoparticles homogeneously dispersed in a polymer matrix have been investigated. Both systems show a core-shell magnetic structure, giving rise to surface and interface effects responsible for the observed rapid increase of remanence and coercivity at low temperature. Moreover, shifted hysteresis loops were observed after field cooling (exchange bias) for alpha-Fe2O3 nanoparticles, due to the interface exchange coupling between the disordered surface magnetic structure, with multiple spin configurations, and the core "antiferromagnetically" ordered structure.
2006
Istituto di Struttura della Materia - ISM - Sede Roma Tor Vergata
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/26453
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact