TITLE

Direct imaging of the structural change generated by dielectric breakdown in MgO based magnetic tunnel junctions

AUTHOR(S)
Thomas, A.; Drewello, V.; Schäfers, M.; Weddemann, A.; Reiss, G.; Eilers, G.; Münzenberg, M.; Thiel, K.; Seibt, M.
PUB. DATE
October 2008
SOURCE
Applied Physics Letters;10/13/2008, Vol. 93 Issue 15, p152508
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
MgO based magnetic tunnel junctions are prepared to investigate the dielectric breakdown of the barrier. The breakdown is visualized by transmission electron microscopy measurements. The broken tunnel junctions are prepared for the microscopy measurements by focused ion beam out of the junctions characterized by transport investigations. A direct comparison of transport behavior and structure of the intact and broken junctions is obtained. The MgO barrier shows many microscopic pinholes after breakdown. This can be explained within a model assuming a relationship between the current density at the breakdown and the rate of pinhole formation.
ACCESSION #
34984721

 

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