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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
mesoscopic systems
Country: Holanda
Editor: Elsevier Science Bv
Citation: Physica E-low-dimensional Systems & Nanostructures. Elsevier Science Bv, v. 39, n. 1, n. 155, n. 158, 2007.
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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