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

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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...

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Autor principal: Peralta-Ramos, J.
Otros Autores: Llois, A.M, Rungger, I., Sanvito, S.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2008
Acceso en línea:Registro en Scopus
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Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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245 1 0 |a I-V curves of Fe/MgO (001) single- and double-barrier tunnel junctions 
260 |c 2008 
270 1 0 |m Peralta-Ramos, J.; Departamento de Física, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina; email: peralta@cnea.gov.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a 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.  |l eng 
593 |a Departamento de Física, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina 
593 |a Departamento de Física, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina 
593 |a School of Physics and CRANN, Trinity College, Dublin 2, Ireland 
700 1 |a Llois, A.M. 
700 1 |a Rungger, I. 
700 1 |a Sanvito, S. 
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