The magnetic properties of Co HCP nanoparticles dispersed in a silica matrix with sizes between 270: 7 and 5 +/- 2.2 nm were investigated. The temperature dependence of zero-field cooled and field cooled magnetizations and of the coercive field were analyzed considering the thermal activated demagnetization process. Enhanced anisotropy was observed for the 2 nm nanoparticles, while the demagnetization process of the larger ones is dominated by interparticle interactions.
Superparamagnetism and coercitivityin HCP-Co nanoparticles dispersed in silica matrix
MATTEI, Giovanni;BATTAGLIN, Giancarlo;MAZZOLDI, Paolo
2004-01-01
Abstract
The magnetic properties of Co HCP nanoparticles dispersed in a silica matrix with sizes between 270: 7 and 5 +/- 2.2 nm were investigated. The temperature dependence of zero-field cooled and field cooled magnetizations and of the coercive field were analyzed considering the thermal activated demagnetization process. Enhanced anisotropy was observed for the 2 nm nanoparticles, while the demagnetization process of the larger ones is dominated by interparticle interactions.
File in questo prodotto:
| File | Dimensione | Formato | |
|---|---|---|---|
|
J Mag Mag Mat 272–276 e1235 Superparamagnetism and coercivity in HCP-Co nanoparticles dispersed in silica matrix.pdf
non disponibili
Tipologia:
Documento in Post-print
Licenza:
Accesso chiuso-personale
Dimensione
192.44 kB
Formato
Adobe PDF
|
192.44 kB | Adobe PDF | Visualizza/Apri |
I documenti in ARCA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
