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Effect of interface intermixing on giant magnetoresistance in NiFe/Cu and Co/NiFe/Co/Cu multilayers

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Effect of interface intermixing on giant magnetoresistance in NiFe/Cu and Co/NiFe/Co/Cu multilayers

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Título Effect of interface intermixing on giant magnetoresistance in NiFe/Cu and Co/NiFe/Co/Cu multilayers
Autor Nagamine, Luiz Carlos Camargo Miranda
Biondo Filho, Armando
Pereira, Luis Gustavo
Mello, Alexandre
Schmidt, Joao Edgar
Chimendes, Tiago Walescko
Cunha, Joao Batista Marimon da
Baggio-Saitovitch, E.
Abstract This article reports on the important influence of the spontaneously built-in paramagnetic interfacial layers on the magnetic and magnetoresistive properties of NiFe/Cu and Co/NiFe/Co/Cu multilayers grown by magnetron sputtering. A computational simulation, based on a semiclassical model, has been used to reproduce the variations of the resistivity and of the magnetoresistance ~MR! amplitude with the thickness of the NiFe, Cu, and Co layers. We showed that the compositionally intermixed layers at NiFe/Cu interfaces, which are paramagnetic, reduce the flow of polarized electrons and produce a masking on the estimated mean-free path of both types of electrons due to the reduction of their effective values, mainly for small NiFe thickness. Moreover, the transmission coefficients for the electrons decrease when Fe buffer layers are replaced by NiFe ones. This result is interpreted in terms of the variations of the interfacial intermixing and roughness at the interfaces, leading to an increase of the paramagnetic interfacial layer thickness. The effect provoked by Co deposition at the NiFe 16 Å/Cu interfaces has also been investigated. The maximum of the MR amplitudes was found at 5 Å of Co, resulting in the quadruplication of the MR amplitude. This result is partially attributed to the interfacial spin-dependent scattering due to the increase of the magnetic order at interfaces. Another effect observed here was the increase of the spin-dependent scattering events in the bulk NiFe due to a larger effective NiFe thickness, since the paramagnetic interfacial layer thickness is decreased.
Contido em Journal of applied physics. Melville. Vol. 94, no. 9 (Nov. 2003), p. 5881-5890
Assunto Cobalto
Cobre
Interdifusao quimica
Ligas de ferro
Ligas de níquel
Magnetoresistencia gigante
Recobrimentos por sputtering
Resistividade eletrica
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/95122
Arquivos Descrição Formato
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