Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/58663
Type: Artigo de periódico
Title: Quantized conductance and giant MR effect in atomic-sized ferromagnetic contacts
Author: Dartora, CA
Viana, GA
Cabrera, GG
Abstract: In this paper we investigate the origin of the giant magnetoresistance effect in atomic-sized magnetic contacts within the framework of Landauer's theory, which relates scattering to conductance in a direct way. It is believed that in magnetic contacts the scattering mechanism is spin-dependent, provided by the exchange interaction between local spin and itinerant electrons. In our model the local spin distribution is explained in terms of localized d-electrons obeying a Heisenberg Hamiltonian while the electronic transport is taken into account by itinerant s-like electrons according to the Anderson model. As the main result we show that the MR effect is strongly dependent on spin-flipping probability of conduction electrons. (C) 2007 Elsevier B.V. All rights reserved.
Subject: Landauer theory
nanomagnetism
mesoscopic systems
nanocontacts
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.physe.2007.03.002
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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