TITLE

Effects of annealing on the local structure of Fe and Co in CoFeB/MgO/CoFeB tunnel junctions: An extended x-ray-absorption fine structure study

AUTHOR(S)
Rumaiz, Abdul K.; Woicik, J. C.; Wang, W. G.; Jordan-Sweet, Jean; Jaffari, G. H.; Ni, C.; Xiao, John Q.; Chien, C. L.
PUB. DATE
March 2010
SOURCE
Applied Physics Letters;3/15/2010, Vol. 96 Issue 11, p112502
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Extended x-ray-absorption fine structure (EXAFS) was used to study the evolution of the local structure of Fe and Co as a function of annealing time in CoFeB/MgO/CoFeB magnetic tunnel junctions. EXAFS indicates B depletion and crystallization of the CoFeB layers within a few seconds of the post growth high temperature anneal. The decrease in first-shell Debye–Waller factor and hence the increase in structural order during annealing explains the increase in tunnel magnetoresistance observed as a result of post deposition annealing.
ACCESSION #
48698121

 

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