Evolution of barrier asymmetry in magnetic tunnel junctions

Brückl H, Schmalhorst J-M, Reiss G, Gieres G, Wecker J (2001)
APPLIED PHYSICS LETTERS 78(8): 1113-1115.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Brückl, Hubert; Schmalhorst, Jan-MichaelUniBi ; Reiss, GünterUniBi ; Gieres, G; Wecker, J
Abstract / Bemerkung
Magnetic tunnel junctions usually consist of different layer stacks at the two sides of the tunneling barrier. The exposure of these junctions to high temperatures thus can induce large asymmetries in the electronic potential with respect to the barrier. Using the example of Co/Cu/Co/Al2O3/Co tunnel junctions, we show that the measured current/voltage characteristics develop a large asymmetry upon annealing at a temperature larger than 230 degreesC. This is accompanied by a Cu enrichment at one side of the barrier and cannot be explained by simply using the work function differences between the electrode materials. Thus, a Cu-Al2O3 intermixing zone at the barrier interface must be taken into account, which leads to an asymmetric step-like barrier shape. The interpretation is supported by numerical evaluation of model barriers which reproduce the experimental asymmetries if an intermixing zone of only 0.2 nm thickness is assumed. (C) 2001 American Institute of Physics.
Erscheinungsjahr
2001
Zeitschriftentitel
APPLIED PHYSICS LETTERS
Band
78
Ausgabe
8
Seite(n)
1113-1115
ISSN
0003-6951
Page URI
https://pub.uni-bielefeld.de/record/1617961

Zitieren

Brückl H, Schmalhorst J-M, Reiss G, Gieres G, Wecker J. Evolution of barrier asymmetry in magnetic tunnel junctions. APPLIED PHYSICS LETTERS. 2001;78(8):1113-1115.
Brückl, H., Schmalhorst, J. - M., Reiss, G., Gieres, G., & Wecker, J. (2001). Evolution of barrier asymmetry in magnetic tunnel junctions. APPLIED PHYSICS LETTERS, 78(8), 1113-1115. https://doi.org/10.1063/1.1350601
Brückl, Hubert, Schmalhorst, Jan-Michael, Reiss, Günter, Gieres, G, and Wecker, J. 2001. “Evolution of barrier asymmetry in magnetic tunnel junctions”. APPLIED PHYSICS LETTERS 78 (8): 1113-1115.
Brückl, H., Schmalhorst, J. - M., Reiss, G., Gieres, G., and Wecker, J. (2001). Evolution of barrier asymmetry in magnetic tunnel junctions. APPLIED PHYSICS LETTERS 78, 1113-1115.
Brückl, H., et al., 2001. Evolution of barrier asymmetry in magnetic tunnel junctions. APPLIED PHYSICS LETTERS, 78(8), p 1113-1115.
H. Brückl, et al., “Evolution of barrier asymmetry in magnetic tunnel junctions”, APPLIED PHYSICS LETTERS, vol. 78, 2001, pp. 1113-1115.
Brückl, H., Schmalhorst, J.-M., Reiss, G., Gieres, G., Wecker, J.: Evolution of barrier asymmetry in magnetic tunnel junctions. APPLIED PHYSICS LETTERS. 78, 1113-1115 (2001).
Brückl, Hubert, Schmalhorst, Jan-Michael, Reiss, Günter, Gieres, G, and Wecker, J. “Evolution of barrier asymmetry in magnetic tunnel junctions”. APPLIED PHYSICS LETTERS 78.8 (2001): 1113-1115.
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