Structure and magnetic properties of Fe-Pd silica composites prepared by sequential ion implantation
- DE JULIAN FERNANDEZ, C
- Mattei, Giovanni
- Sangregorio, C
- Tagliente, Ma
- Bello, V
- Battaglin, G
- Sada, Cinzia
- Tapfer, L
- Gatteschi, D
- Mazzoldi, Paolo
Publication date
January 2004
DOI Publisher
Elsevier BV ISSN
0022-3093 Citation count (estimate)
5Abstract
The nanostructural and magnetic properties of Fe\u2013Pd/SiO2 granular solids prepared by sequential ion implantation have been investigated. Nanostructural features depend on the relative Pd/Fe implanted dose and, in particular, in the Pd50Fe50 sample 2\u2013 6 nm size nanoparticles with the disordered FCC structure are formed. At low temperatures Fe\u2013Pd composites have open hysteresis loops with coercivity fields of some mT and large magnetic moment per Fe atom (2.8 uB). In only-Fe and Fe\u2013Pd composites the nanoparticles are superparamagnetic at room temperature and the blocking temperature increases from 20 K, for the only-Fe sample, to 110K, for Fe50Pd50 sample
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