Dielectric breakdown and inelastic electron tunneling spectroscopy of top and bottom pinned Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions

Khan AA, Schmalhorst J-M, Thomas A, Drewello V, Reiss G (2009)
Journal of Applied Physics 105(8).

Journal Article | Published | English

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Abstract
The time dependent dielectric breakdown in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions was investigated by voltage ramp experiments. The measurements were done for two types of junctions: one set of junctions had exchange biased (pinned) bottom electrodes and one set had exchange biased (pinned) top electrodes with an additional artificial ferrimagnet. We found a significant polarity dependence in the dielectric breakdown: top as well as bottom pinned tunnel junctions showed higher breakdown voltage when the top electrode was biased positively compared to negative bias. In contrast to this the differential resistance (dV/dI)-V spectra revealed an asymmetry for the top pinned junctions which was reversed in comparison to the bottom pinned system. This indicates that both asymmetries have different origins. Additionally the bottom pinned junctions showed in general slightly lower breakdown voltages and stronger magnon excitation in the inelastic electron tunneling (d(2)I/dV(2))-V spectra than the top pinned junctions. Possible reasons for these correlations are discussed.
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Khan AA, Schmalhorst J-M, Thomas A, Drewello V, Reiss G. Dielectric breakdown and inelastic electron tunneling spectroscopy of top and bottom pinned Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions. Journal of Applied Physics. 2009;105(8).
Khan, A. A., Schmalhorst, J. - M., Thomas, A., Drewello, V., & Reiss, G. (2009). Dielectric breakdown and inelastic electron tunneling spectroscopy of top and bottom pinned Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions. Journal of Applied Physics, 105(8).
Khan, A. A., Schmalhorst, J. - M., Thomas, A., Drewello, V., and Reiss, G. (2009). Dielectric breakdown and inelastic electron tunneling spectroscopy of top and bottom pinned Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions. Journal of Applied Physics 105.
Khan, A.A., et al., 2009. Dielectric breakdown and inelastic electron tunneling spectroscopy of top and bottom pinned Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions. Journal of Applied Physics, 105(8).
A.A. Khan, et al., “Dielectric breakdown and inelastic electron tunneling spectroscopy of top and bottom pinned Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions”, Journal of Applied Physics, vol. 105, 2009.
Khan, A.A., Schmalhorst, J.-M., Thomas, A., Drewello, V., Reiss, G.: Dielectric breakdown and inelastic electron tunneling spectroscopy of top and bottom pinned Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions. Journal of Applied Physics. 105, (2009).
Khan, Ayaz Arif, Schmalhorst, Jan-Michael, Thomas, Andy, Drewello, Volker, and Reiss, Günter. “Dielectric breakdown and inelastic electron tunneling spectroscopy of top and bottom pinned Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions”. Journal of Applied Physics 105.8 (2009).
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