From direct to inverse GMR: Introduction of Cr in Fe/Cu superlattices

It is well known that layered systems can present giant magnetoresistance (GMR). Particularly, the multilayers FeN/Cu8/Fe M/Cr/ FeM/Cu8 show inverse GMR. That is, the electrical conductivity decreases with the applied magnetic field. In the most common multilayers the conductivity increases with the...

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Autores principales: Milano, J., Llois, A.M.
Formato: JOUR
Materias:
Band structure calculations
Magnetoresistance-multilayers
Multilayers-metallic
Transport properties
Electric conductivity
Electron transport properties
Galvanomagnetic effects
Multilayers
Parallel flow
Applied magnetic fields
Band structure calculation
Electrical conductivity
Giant magnetoresistances (GMR)
Semi-classical approximation
Spin dependent scattering
Giant magnetoresistance
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03048853_v226-230_nPARTII_p1755_Milano
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_03048853_v226-230_nPARTII_p1755_Milano2023-10-03T15:21:04Z From direct to inverse GMR: Introduction of Cr in Fe/Cu superlattices Milano, J. Llois, A.M. Band structure calculations Magnetoresistance-multilayers Multilayers-metallic Transport properties Electric conductivity Electron transport properties Galvanomagnetic effects Multilayers Parallel flow Applied magnetic fields Band structure calculation Electrical conductivity Giant magnetoresistances (GMR) Magnetoresistance-multilayers Multilayers-metallic Semi-classical approximation Spin dependent scattering Giant magnetoresistance It is well known that layered systems can present giant magnetoresistance (GMR). Particularly, the multilayers FeN/Cu8/Fe M/Cr/ FeM/Cu8 show inverse GMR. That is, the electrical conductivity decreases with the applied magnetic field. In the most common multilayers the conductivity increases with the applied field and this kind of GMR is called direct. In general the GMR is attributed to spin-dependent scattering in the bulk and mainly at interfaces. In this work we calculate the electronic band contribution to the GMR for Fe3/Cu 4/Fe/Cr/Fe/Cu4 and Fe3/Cu4 multilayers within the semiclassical approximation. The electrical conductivity is obtained in the ballistic and diffusive regimes. The results show a large change in the GMR behavior when one layer of Cr is introduced within the Fe layers. The GMR calculated in the CPP configuration (current flowing perpendicular to layers) of Fe3/Cu4 is of the direct type, with a value of about 40% while that obtained for Fe3/Cu 4/Fe/Cr/Fe/Cu4 is inverse and of the order of 45%. In the CIP configuration (current flowing parallel to the layers) the calculated GMR is direct with a value of about 35% for the system without Cr while, by the introduction of Cr, we obtain also a direct GMR but of about 3%. © 2001 Published by Elsevier Science B.V. Fil:Milano, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Llois, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03048853_v226-230_nPARTII_p1755_Milano
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Band structure calculations
Magnetoresistance-multilayers
Multilayers-metallic
Transport properties
Electric conductivity
Electron transport properties
Galvanomagnetic effects
Multilayers
Parallel flow
Applied magnetic fields
Band structure calculation
Electrical conductivity
Giant magnetoresistances (GMR)
Magnetoresistance-multilayers
Multilayers-metallic
Semi-classical approximation
Spin dependent scattering
Giant magnetoresistance
spellingShingle Band structure calculations
Magnetoresistance-multilayers
Multilayers-metallic
Transport properties
Electric conductivity
Electron transport properties
Galvanomagnetic effects
Multilayers
Parallel flow
Applied magnetic fields
Band structure calculation
Electrical conductivity
Giant magnetoresistances (GMR)
Magnetoresistance-multilayers
Multilayers-metallic
Semi-classical approximation
Spin dependent scattering
Giant magnetoresistance
Milano, J.
Llois, A.M.
From direct to inverse GMR: Introduction of Cr in Fe/Cu superlattices
topic_facet Band structure calculations
Magnetoresistance-multilayers
Multilayers-metallic
Transport properties
Electric conductivity
Electron transport properties
Galvanomagnetic effects
Multilayers
Parallel flow
Applied magnetic fields
Band structure calculation
Electrical conductivity
Giant magnetoresistances (GMR)
Magnetoresistance-multilayers
Multilayers-metallic
Semi-classical approximation
Spin dependent scattering
Giant magnetoresistance
description It is well known that layered systems can present giant magnetoresistance (GMR). Particularly, the multilayers FeN/Cu8/Fe M/Cr/ FeM/Cu8 show inverse GMR. That is, the electrical conductivity decreases with the applied magnetic field. In the most common multilayers the conductivity increases with the applied field and this kind of GMR is called direct. In general the GMR is attributed to spin-dependent scattering in the bulk and mainly at interfaces. In this work we calculate the electronic band contribution to the GMR for Fe3/Cu 4/Fe/Cr/Fe/Cu4 and Fe3/Cu4 multilayers within the semiclassical approximation. The electrical conductivity is obtained in the ballistic and diffusive regimes. The results show a large change in the GMR behavior when one layer of Cr is introduced within the Fe layers. The GMR calculated in the CPP configuration (current flowing perpendicular to layers) of Fe3/Cu4 is of the direct type, with a value of about 40% while that obtained for Fe3/Cu 4/Fe/Cr/Fe/Cu4 is inverse and of the order of 45%. In the CIP configuration (current flowing parallel to the layers) the calculated GMR is direct with a value of about 35% for the system without Cr while, by the introduction of Cr, we obtain also a direct GMR but of about 3%. © 2001 Published by Elsevier Science B.V.
format JOUR
author Milano, J.
Llois, A.M.
author_facet Milano, J.
Llois, A.M.
author_sort Milano, J.
title From direct to inverse GMR: Introduction of Cr in Fe/Cu superlattices
title_short From direct to inverse GMR: Introduction of Cr in Fe/Cu superlattices
title_full From direct to inverse GMR: Introduction of Cr in Fe/Cu superlattices
title_fullStr From direct to inverse GMR: Introduction of Cr in Fe/Cu superlattices
title_full_unstemmed From direct to inverse GMR: Introduction of Cr in Fe/Cu superlattices
title_sort from direct to inverse gmr: introduction of cr in fe/cu superlattices
url http://hdl.handle.net/20.500.12110/paper_03048853_v226-230_nPARTII_p1755_Milano
work_keys_str_mv AT milanoj fromdirecttoinversegmrintroductionofcrinfecusuperlattices
AT lloisam fromdirecttoinversegmrintroductionofcrinfecusuperlattices
_version_ 1782025880331091968

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