Nanostructure and magnetic properties of CoNi-alloy-based nanoparticles dispersed in a silica matrix

Authors
de Julian, C Sangregorio, C Mattei, G Battaglin, G Cattaruzza, E Gonella, F Lo Russo, S D'Orazio, F Lucari, F De, G Gatteschi, D Mazzoldi, P
Citation
C. De Julian et al., Nanostructure and magnetic properties of CoNi-alloy-based nanoparticles dispersed in a silica matrix, J MAGN MAGN, 226, 2001, pp. 1912-1914
Citations number
4
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN journal
03048853 → ACNP
Volume
226
Year of publication
2001
Part
2
Pages
1912 - 1914
Database
ISI
SICI code
0304-8853(200105)226:<1912:NAMPOC>2.0.ZU;2-I
Abstract
A comparative study of the magnetic behavior of FCC alloy CoNi (1 : 1) nano particles, embedded in a silica matrix and prepared by the ion implantation and sol-gel techniques, is presented. The blocking temperature is related to the size distribution, and, at least for the ion-implanted samples, only an enhanced effective anisotropy explains the experimental results. The hy steretic behavior is explained in terms of the temperature dependence of th e anisotropy and of the particle volume fraction that determines the dipola r interactions. (C) 2001 Elsevier Science B.V. All rights reserved.