I-V curves of Fe/MgO (001) single- and double-barrier tunnel junctions

In this work, we calculate with ab initio methods the current-voltage characteristics for ideal single- and double-barrier Fe/MgO (001) magnetic tunnel junctions. The current is calculated in the phase-coherent limit by using the recently developed SMEAGOL code, combining the nonequilibrium Green fu...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Peralta Ramos, Jerónimo, Llois, Ana María
Publicado: 2008
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v78_n2_p_PeraltaRamos
http://hdl.handle.net/20.500.12110/paper_10980121_v78_n2_p_PeraltaRamos
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_10980121_v78_n2_p_PeraltaRamos
record_format dspace
spelling paper:paper_10980121_v78_n2_p_PeraltaRamos2023-06-08T16:07:41Z I-V curves of Fe/MgO (001) single- and double-barrier tunnel junctions Peralta Ramos, Jerónimo Llois, Ana María In this work, we calculate with ab initio methods the current-voltage characteristics for ideal single- and double-barrier Fe/MgO (001) magnetic tunnel junctions. The current is calculated in the phase-coherent limit by using the recently developed SMEAGOL code, combining the nonequilibrium Green function formalism with density-functional theory. In general we find that double-barrier junctions display a larger magnetoresistance, which decays with bias at a slower pace than their single-barrier counterparts. This is explained in terms of enhanced spin filtering from the middle Fe layer sandwiched in between the two MgO barriers. In addition, for double-barrier tunnel junctions, we find a well defined peak in the magnetoresistance at a voltage of V=0.1 V. This is the signature of resonant tunneling across a majority quantum well state. Our findings are discussed in relation to recent experiments. © 2008 The American Physical Society. Fil:Peralta-Ramos, 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. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v78_n2_p_PeraltaRamos http://hdl.handle.net/20.500.12110/paper_10980121_v78_n2_p_PeraltaRamos
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description In this work, we calculate with ab initio methods the current-voltage characteristics for ideal single- and double-barrier Fe/MgO (001) magnetic tunnel junctions. The current is calculated in the phase-coherent limit by using the recently developed SMEAGOL code, combining the nonequilibrium Green function formalism with density-functional theory. In general we find that double-barrier junctions display a larger magnetoresistance, which decays with bias at a slower pace than their single-barrier counterparts. This is explained in terms of enhanced spin filtering from the middle Fe layer sandwiched in between the two MgO barriers. In addition, for double-barrier tunnel junctions, we find a well defined peak in the magnetoresistance at a voltage of V=0.1 V. This is the signature of resonant tunneling across a majority quantum well state. Our findings are discussed in relation to recent experiments. © 2008 The American Physical Society.
author Peralta Ramos, Jerónimo
Llois, Ana María
spellingShingle Peralta Ramos, Jerónimo
Llois, Ana María
I-V curves of Fe/MgO (001) single- and double-barrier tunnel junctions
author_facet Peralta Ramos, Jerónimo
Llois, Ana María
author_sort Peralta Ramos, Jerónimo
title I-V curves of Fe/MgO (001) single- and double-barrier tunnel junctions
title_short I-V curves of Fe/MgO (001) single- and double-barrier tunnel junctions
title_full I-V curves of Fe/MgO (001) single- and double-barrier tunnel junctions
title_fullStr I-V curves of Fe/MgO (001) single- and double-barrier tunnel junctions
title_full_unstemmed I-V curves of Fe/MgO (001) single- and double-barrier tunnel junctions
title_sort i-v curves of fe/mgo (001) single- and double-barrier tunnel junctions
publishDate 2008
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v78_n2_p_PeraltaRamos
http://hdl.handle.net/20.500.12110/paper_10980121_v78_n2_p_PeraltaRamos
work_keys_str_mv AT peraltaramosjeronimo ivcurvesoffemgo001singleanddoublebarriertunneljunctions
AT lloisanamaria ivcurvesoffemgo001singleanddoublebarriertunneljunctions
_version_ 1768545750114893824

Ejemplares similares