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Type: Artigo de periódico
Title: Blocking phenomena in granular magnetic alloys through magnetization, Hall effect, and magnetoresistance experiments
Author: Denardin, JC
Pakhomov, AB
Brandl, AL
Socolovsky, LM
Knobel, M
Zhang, XX
Abstract: Magnetization and magnetotransport were measured in CoxAg1-x granular composites as a function of temperature and applied magnetic field. A transition from blocked to superparamagnetic behavior with increasing temperatures can be observed in magnetization, giant magnetoresistance and the extraordinary Hall effect measurements. However, the blocking temperature determined from magnetotransport measurements is systematically lower than the one estimated from magnetic measurements. This is due to the selective magnetic scattering, which is enhanced for smaller particles, while the magnetization probes the whole particle size distribution. (C) 2003 American Institute of Physics.
Country: EUA
Editor: Amer Inst Physics
Rights: aberto
Identifier DOI: 10.1063/1.1542678
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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