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Magnetic Nanoparticle Aggregation States in Ag100-xFex Cosputtered Granular Films Investigated by Magnetic and Magnetotransport Measurements

Published online by Cambridge University Press:  01 February 2011

Paolo Allia ,
Federica Celegato ,
Marco Coisson ,
Paola Tiberto ,
Franco Vinai  and
Federico Spizzo
Paolo Allia
Affiliation:
Physics Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, I- 1029 Torino, Italy
Federica Celegato
Affiliation:
Physics Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, I- 1029 Torino, Italy
Marco Coisson
Affiliation:
Materials Department, IEN Galileo Ferraris, Strada delle Cacce 91, I-10135 Torino, Italy
Paola Tiberto
Affiliation:
Materials Department, IEN Galileo Ferraris, Strada delle Cacce 91, I-10135 Torino, Italy
Franco Vinai
Affiliation:
Materials Department, IEN Galileo Ferraris, Strada delle Cacce 91, I-10135 Torino, Italy
Federico Spizzo
Affiliation:
Physics Department, Universitä di Ferrara, Via Paradiso 12, I-44100 Ferrara, Italy
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Abstract

Magnetoresistance and.magnetization measurements have been performed on nanogranular, cosputtered Ag100-xFex films (x= 10 to 30) in the 4 K – 300 K temperature interval. The analysis reveals that the films with x ≤ 14 are interacting superparamagnets, characterized by a magnetic correlation length of the order of the electronic mean free path λ. Films with x ≥ 26 behave as concentrated magnets with strong competing interactions among magnetic moments (frustrated ferromagnets) and magnetic correlation length much larger than λ.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 877: Symposium S – Magnetic Nanoparticles and Nanowires , 2005 , S5.4
Copyright
Copyright © Materials Research Society 2005

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References

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