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Type: Artigo de periódico
Title: Nanostructure of granular Co-SiO2 thin films modified by thermal treatment and its relationship with the giant Hall effect
Author: Socolovsky, LM
Oliveira, CLP
Denardin, JC
Knobel, M
Torriani, IL
Abstract: Granular cosputtered Co-52(SiO2)(48) thin films were thermally treated at different temperatures and their magnetotransport and structural properties were investigated. Hall resistivity increases with annealing temperature (T-a), up to T-a=250 degrees C, and then decreases to a minimum for T-a=400 degrees C. The structural analysis was based on small-angle x-ray scattering results. A model of a polydisperse system of hard spheres was used to retrieve structural parameters. Results reveal that a volume fraction of Co atoms (approximately 25%) are forming nanospheres. The giant Hall effect depends on a particular combination of nanoparticle diameter, size distribution, and interparticle distance.
Country: EUA
Editor: Amer Physical Soc
Citation: Physical Review B. Amer Physical Soc, v. 72, n. 18, 2005.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.72.184423
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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