TITLE

Spin polarization and barrier-oxidation effects at the Co/alumina interface in magnetic tunnel junctions

AUTHOR(S)
Telling, N. D.; van der Laan, G.; Ladak, S.; Hicken, R. J.
PUB. DATE
October 2004
SOURCE
Applied Physics Letters;10/25/2004, Vol. 85 Issue 17, p3803
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The electronic structure and polarization in magnetic tunnel junctions prepared with varying degrees of barrier-layer oxidation have been studied using x-ray absorption spectroscopy across the Co L2,3 absorption edges. It was found that the Co electronic structure near the Co/alumina interface tended to that of cobalt oxide as the barrier oxidation time was increased. However, the net Co 3d spin polarization, determined from x-ray magnetic circular dichroism, increased for moderate oxidation times compared to that obtained for an under-oxidized Co/Al interface. It is proposed that the expected dilution of the measured polarization due to the formation of (room temperature) paramagnetic cobalt oxide, is offset by an increase in the Co 3d spin-polarization of the interface layer as the interface bonding changes from Co–Al to Co–O with increasing oxidation times.
ACCESSION #
14909822

 

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