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Morphology and magnetic properties of size-selected Ni nanoparticle films (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Morphology and magnetic properties of size-selected Ni nanoparticle films (Articolo in rivista) (literal)

Anno

2010-01-01T00:00:00+01:00 (literal)

Alternative label

D'Addato S., Gragnaniello L., Valeri S., Rota A., di Bona A., Spizzo F., Panozaqi T. and Schifano S.F. (2010)
Morphology and magnetic properties of size-selected Ni nanoparticle films
in Journal of applied physics
(literal)

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D'Addato S., Gragnaniello L., Valeri S., Rota A., di Bona A., Spizzo F., Panozaqi T. and Schifano S.F. (literal)

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107 (literal)

Rivista

Journal of applied physics (Rivista)

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Issue: 10 Article Number: 104318 Acknowledgement: We thank C. Menozzi and G. Gazzadi for assistance in SEM experiments. This work was supported by CNR-INFM and Fondazione della Cassa di Risparmio di Modena. (literal)

Note

ISI Web of Science (WOS) (literal)

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1. Univ Modena & Reggio Emilia, Ctr S3, CNR Ist Nanosci, I-41125 Modena, Italy (D'Addato S., Gragnaniello L., Valeri S., Rota A., di Bona A., 2. Univ Modena & Reggio Emilia, Dipartimento Fis, I-41125 Modena, Italy (D'Addato S., Gragnaniello L., Valeri S., Rota A., di Bona A.) 3. Univ Ferrara, Dipartmento Fis, I-44122 Ferrara, Italy (Spizzo F., Panozaqi T., Schifano S.F.) 4. Univ Ferrara, CNISM, I-44122 Ferrara, Italy (Spizzo F., Panozaqi T., Schifano S.F.) (literal)

Titolo

Morphology and magnetic properties of size-selected Ni nanoparticle films (literal)

Abstract

We present the results of a study on the morphology and magnetic properties of size-selected Ni nanoparticles films grown on Si/SiOx substrates. The films were produced by deposition of preformed Ni nanoparticles, using a gas aggregation nanocluster source and an electric quadrupole mass filter. The diameter d of the produced particles ranged between 3 and 10 nm. The morphology of the films, with average thickness t varying from t=0.5 up to t=7 nm, was studied with atomic force microscopy and scanning electron microscopy, combining in this way information about height and lateral topography. We observed the presence of some small aggregates made of two or three particles at the early stage of film formation, probably due to some degree of cluster diffusion on the substrate, and particle average flattening. For increasing values of t, large agglomerates are formed in the films, resulting in a porous structure. Information about the magnetic properties was obtained with field cooled-zero field cooled (FC/ZFC) magnetization curves. We observed a reversibility-irreversibility transition at temperatures 70 K < T-I < 80 K, and a significant deviation from the superparamagnetic behavior at T > T-I, even for the lowest coverage studied (t=2 nm for ZFC/FC measurements, < d > = 5.5 nm). A comparison with Monte Carlo simulations of the FC/ZFC curves reveals the concurrence between interparticle exchange interaction and single particle random anisotropy. (C) 2010 American Institute of Physics. [doi:10.1063/1.3374467] (literal)

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