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

Abdul K. Rumaiz, J. C. Woicik, Weigang Wang, Jean Jordan-Sweet, G. H. Jaffari, C. Ni, John Q. Xiao, C. L. Chien

Research output: Contribution to journalArticle

24 Citations (Scopus)

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.

Original languageEnglish (US)
Article number112502
JournalApplied Physics Letters
Volume96
Issue number11
DOIs
StatePublished - 2010
Externally publishedYes

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x ray absorption
tunnel junctions
fine structure
annealing
tunnels
depletion
crystallization

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

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. / Rumaiz, Abdul K.; Woicik, J. C.; Wang, Weigang; Jordan-Sweet, Jean; Jaffari, G. H.; Ni, C.; Xiao, John Q.; Chien, C. L.

In: Applied Physics Letters, Vol. 96, No. 11, 112502, 2010.

Research output: Contribution to journalArticle

Rumaiz, Abdul K. ; Woicik, J. C. ; Wang, Weigang ; Jordan-Sweet, Jean ; Jaffari, G. H. ; Ni, C. ; Xiao, John Q. ; Chien, C. L. / 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. In: Applied Physics Letters. 2010 ; Vol. 96, No. 11.
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