Inelastic electron tunneling spectra of MgO-based magnetic tunnel junctions with different electrode designs

Drewello V, Schäfers M, Schebaum O, Khan AA, Münchenberger J, Schmalhorst J-M, Reiss G, Thomas A (2009)
PHYSICAL REVIEW B 79(17).

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Abstract / Bemerkung
MgO-based magnetic tunnel junctions with up to 230% tunnel magnetoresistance ratio at room temperature and up to 345% at 13 K are prepared. The lower electrode is either exchange-biased or free, while the top electrode is free or an exchanged-biased artificial ferrimagnet, respectively. Additionally, a pseudo-spin-valve (hard-soft switching) design with two unpinned electrodes is used. Inelastic electron-tunneling spectra for each of these systems show a strong variation in the zero-bias anomaly with a reduced peak for some of the junctions. At voltages around 200 mV additional structures are found, which are not known from junctions with lower magneto resistance, such as alumina-based junctions. We discuss the spectra for the different electrode types and compare our findings with respect to barrier material and magnetoresistance ratio.
Stichworte
structure; magnesium compounds; ferrimagnetic materials; tunnelling magnetoresistance; magnetic; tunnelling spectra; electrodes
Erscheinungsjahr
2009
Zeitschriftentitel
PHYSICAL REVIEW B
Band
79
Ausgabe
17
ISSN
1098-0121
eISSN
1550-235X
Page URI
https://pub.uni-bielefeld.de/record/1633643

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Drewello V, Schäfers M, Schebaum O, et al. Inelastic electron tunneling spectra of MgO-based magnetic tunnel junctions with different electrode designs. PHYSICAL REVIEW B. 2009;79(17).
Drewello, V., Schäfers, M., Schebaum, O., Khan, A. A., Münchenberger, J., Schmalhorst, J. - M., Reiss, G., et al. (2009). Inelastic electron tunneling spectra of MgO-based magnetic tunnel junctions with different electrode designs. PHYSICAL REVIEW B, 79(17). doi:10.1103/PhysRevB.79.174417
Drewello, V., Schäfers, M., Schebaum, O., Khan, A. A., Münchenberger, J., Schmalhorst, J. - M., Reiss, G., and Thomas, A. (2009). Inelastic electron tunneling spectra of MgO-based magnetic tunnel junctions with different electrode designs. PHYSICAL REVIEW B 79.
Drewello, V., et al., 2009. Inelastic electron tunneling spectra of MgO-based magnetic tunnel junctions with different electrode designs. PHYSICAL REVIEW B, 79(17).
V. Drewello, et al., “Inelastic electron tunneling spectra of MgO-based magnetic tunnel junctions with different electrode designs”, PHYSICAL REVIEW B, vol. 79, 2009.
Drewello, V., Schäfers, M., Schebaum, O., Khan, A.A., Münchenberger, J., Schmalhorst, J.-M., Reiss, G., Thomas, A.: Inelastic electron tunneling spectra of MgO-based magnetic tunnel junctions with different electrode designs. PHYSICAL REVIEW B. 79, (2009).
Drewello, Volker, Schäfers, Markus, Schebaum, Oliver, Khan, Ayaz Arif, Münchenberger, Jana, Schmalhorst, Jan-Michael, Reiss, Günter, and Thomas, Andy. “Inelastic electron tunneling spectra of MgO-based magnetic tunnel junctions with different electrode designs”. PHYSICAL REVIEW B 79.17 (2009).