Elastic and inelastic conductance in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions

Khan AA, Schmalhorst J-M, Reiss G, Eilers G, Muenzenberg M, Schuhmann H, Seibt M (2010)
PHYSICAL REVIEW B 82(6): 064416.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
Download
Es wurden keine Dateien hochgeladen. Nur Publikationsnachweis!
Autor*in
Khan, Ayaz Arif; Schmalhorst, Jan-MichaelUniBi ; Reiss, GünterUniBi ; Eilers, G.; Muenzenberg, M.; Schuhmann, H.; Seibt, M.
Abstract / Bemerkung
A systematic analysis of the bias voltage and temperature dependence of the tunneling magnetoresistance (TMR) in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions with barrier thickness t(B) between 1.8 and 4.0 nm has been performed. The resistance measured at low temperature in the parallel state shows the expected exponential increase with increasing barrier thickness. The low-temperature TMR amplitude of about 300% is quite similar for all MgO thicknesses. This is in accordance with microstructural investigations by transmission electron microscopy, which do not give hints to a reduction in the barrier quality with increasing MgO thickness. Both the junction resistance and TMR decrease with increasing temperature and bias voltage. In general, the decrease is much stronger for thicker barriers, e. g., a decrease in the TMR by a factor of 13.4 from 293% at 15 K to 21.9% at 300 K was observed for t(B) = 4.0 nm compared to a reduction by only a factor of 1.6 for t(B) = 1.8 nm. This behavior can be described self-consistently for all barrier thicknesses within a model that extends the magnon-assisted tunneling model by adding an inelastic, unpolarized tunneling contribution. Furthermore we discuss our results in the framework of a recent model by Lu et al. [Phys. Rev. Lett. 102, 176801 (2009)] claiming that polarized hopping conductance becomes important for larger MgO thickness.
Erscheinungsjahr
2010
Zeitschriftentitel
PHYSICAL REVIEW B
Band
82
Ausgabe
6
Art.-Nr.
064416
ISSN
1098-0121
eISSN
1550-235X
Page URI
https://pub.uni-bielefeld.de/record/1794272

Zitieren

Khan AA, Schmalhorst J-M, Reiss G, et al. Elastic and inelastic conductance in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions. PHYSICAL REVIEW B. 2010;82(6): 064416.
Khan, A. A., Schmalhorst, J. - M., Reiss, G., Eilers, G., Muenzenberg, M., Schuhmann, H., & Seibt, M. (2010). Elastic and inelastic conductance in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions. PHYSICAL REVIEW B, 82(6), 064416. https://doi.org/10.1103/PhysRevB.82.064416
Khan, Ayaz Arif, Schmalhorst, Jan-Michael, Reiss, Günter, Eilers, G., Muenzenberg, M., Schuhmann, H., and Seibt, M. 2010. “Elastic and inelastic conductance in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions”. PHYSICAL REVIEW B 82 (6): 064416.
Khan, A. A., Schmalhorst, J. - M., Reiss, G., Eilers, G., Muenzenberg, M., Schuhmann, H., and Seibt, M. (2010). Elastic and inelastic conductance in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions. PHYSICAL REVIEW B 82:064416.
Khan, A.A., et al., 2010. Elastic and inelastic conductance in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions. PHYSICAL REVIEW B, 82(6): 064416.
A.A. Khan, et al., “Elastic and inelastic conductance in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions”, PHYSICAL REVIEW B, vol. 82, 2010, : 064416.
Khan, A.A., Schmalhorst, J.-M., Reiss, G., Eilers, G., Muenzenberg, M., Schuhmann, H., Seibt, M.: Elastic and inelastic conductance in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions. PHYSICAL REVIEW B. 82, : 064416 (2010).
Khan, Ayaz Arif, Schmalhorst, Jan-Michael, Reiss, Günter, Eilers, G., Muenzenberg, M., Schuhmann, H., and Seibt, M. “Elastic and inelastic conductance in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions”. PHYSICAL REVIEW B 82.6 (2010): 064416.
Export

Markieren/ Markierung löschen
Markierte Publikationen

Open Data PUB

Web of Science

Dieser Datensatz im Web of Science®
Suchen in

Google Scholar