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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|
|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.|
|Editor:||Amer Physical Soc|
|Citation:||Physical Review B. Amer Physical Soc, v. 72, n. 18, 2005.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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