Structural, electronic, and magnetic properties of Fe/CaS (001) interfaces and Fe/CaS/Fe (001) heterostructures have been studied by means of a self-consistent Green's function technique for surface and interfaces implemented within the tight-binding linear muffin-tin orbital formalism. Spin dependent transport properties of the Fe/CaS/Fe (001) tunnel junctions with thin and intermediate barriers, in the current-perpendicular-to-plane geometry, have been determined by means of Kubo-Landauer approach implemented within the tight-binding linear muffin-tin orbital formalism. A small charge rearrangement is evidenced at the Fe/CaS (001) interfaces. The iron interfacial magnetic moments are enhanced over the bulk value. A small exchange coupling with the sign depending on the Fe/CaS (001) interface geometric structure and the strength decaying exponentially with the barrier is evidenced. Interfacial charge transfer, interface iron magnetic moments, and tunneling currents are sensitive to the interfacial structure. Interface resonant states have a decisive role in the tunneling process and the main contribution to the current in the ferromagnetic state of the junction is given by the minority-spin electrons.
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7 February 2013
Research Article|
February 07 2013
Structural, electronic, magnetic and spin dependent transport properties of Fe/CaS/Fe (001) heterostructures
P. Vlaic;
P. Vlaic
1
Faculty of Physics, Babes-Bolyai University
, 400084 Cluj-Napoca, Romania
2
University of Medicine and Pharmacy “Iuliu Hatieganu”, Biophysics Department
, 400023 Cluj-Napoca, Romania
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E. Burzo;
E. Burzo
1
Faculty of Physics, Babes-Bolyai University
, 400084 Cluj-Napoca, Romania
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K. Carva
K. Carva
3
Department of Condensed Matter Physics, Charles University, Faculty of Mathematics and Physics
, Ke Karlovu 5, CZ-12116 Prague 2, Czech Republic
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P. Vlaic
1,2
E. Burzo
1
K. Carva
3
1
Faculty of Physics, Babes-Bolyai University
, 400084 Cluj-Napoca, Romania
2
University of Medicine and Pharmacy “Iuliu Hatieganu”, Biophysics Department
, 400023 Cluj-Napoca, Romania
3
Department of Condensed Matter Physics, Charles University, Faculty of Mathematics and Physics
, Ke Karlovu 5, CZ-12116 Prague 2, Czech Republic
J. Appl. Phys. 113, 053715 (2013)
Article history
Received:
October 20 2012
Accepted:
January 22 2013
Citation
P. Vlaic, E. Burzo, K. Carva; Structural, electronic, magnetic and spin dependent transport properties of Fe/CaS/Fe (001) heterostructures. J. Appl. Phys. 7 February 2013; 113 (5): 053715. https://doi.org/10.1063/1.4790574
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