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Abstract:

We calculate the tunneling magnetoresistance (TMR) of Fe ZnSe Fe ZnSe Fe (001) double magnetic tunnel junctions (DMTJs) as a function of the in-between Fe layer's thickness, and compare these results with those of Fe ZnSe Fe simple junctions. The electronic band structures are modeled by a parametrized tight-binding Hamiltonian fitted to ab initio calculations, and the conductance is calculated in the coherent, elastic and linear response regime within the Landauer formalism. We find that the DMTJs' TMR values can be higher than those of simple junctions, and that the TMR enhancements are mainly due to a decrease in the conductance of all but one spin channel and not due to the spin-dependent resonant tunneling effect. For a wide ZnSe width range, the TMR enhancements are large and practically independent of the in-between Fe thickness, which may be relevant for applications in spintronics. © 2006 The American Physical Society.

Registro:

Documento: Artículo
Título:Enhanced tunneling magnetoresistance in Fe ZnSe double junctions: Ab initio calculations
Autor:Peralta-Ramos, J.; Llois, A.M.
Filiación:Departamento de Física, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
Departamento de Física, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Año:2006
Volumen:73
Número:21
DOI: http://dx.doi.org/10.1103/PhysRevB.73.214422
Título revista:Physical Review B - Condensed Matter and Materials Physics
Título revista abreviado:Phys. Rev. B Condens. Matter Mater. Phys.
ISSN:10980121
CODEN:PRBMD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v73_n21_p_PeraltaRamos

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Citas:

---------- APA ----------
Peralta-Ramos, J. & Llois, A.M. (2006) . Enhanced tunneling magnetoresistance in Fe ZnSe double junctions: Ab initio calculations. Physical Review B - Condensed Matter and Materials Physics, 73(21).
http://dx.doi.org/10.1103/PhysRevB.73.214422
---------- CHICAGO ----------
Peralta-Ramos, J., Llois, A.M. "Enhanced tunneling magnetoresistance in Fe ZnSe double junctions: Ab initio calculations" . Physical Review B - Condensed Matter and Materials Physics 73, no. 21 (2006).
http://dx.doi.org/10.1103/PhysRevB.73.214422
---------- MLA ----------
Peralta-Ramos, J., Llois, A.M. "Enhanced tunneling magnetoresistance in Fe ZnSe double junctions: Ab initio calculations" . Physical Review B - Condensed Matter and Materials Physics, vol. 73, no. 21, 2006.
http://dx.doi.org/10.1103/PhysRevB.73.214422
---------- VANCOUVER ----------
Peralta-Ramos, J., Llois, A.M. Enhanced tunneling magnetoresistance in Fe ZnSe double junctions: Ab initio calculations. Phys. Rev. B Condens. Matter Mater. Phys. 2006;73(21).
http://dx.doi.org/10.1103/PhysRevB.73.214422