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; W. G. Wang; Jean Jordan-Sweet; G. H. Jaffari; C. Ni; John Q. Xiao; C. L. Chien

doi:10.1063/1.3364137

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, W. G. Wang, Jean Jordan-Sweet, G. H. Jaffari, C. Ni, John Q. Xiao, C. L. Chien

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32 Scopus citations

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 language	English (US)
Article number	112502
Journal	Applied Physics Letters
Volume	96
Issue number	11
DOIs	https://doi.org/10.1063/1.3364137
State	Published - 2010
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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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",

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.",

author = "Rumaiz, {Abdul K.} and Woicik, {J. C.} and Wang, {W. G.} and Jean Jordan-Sweet and Jaffari, {G. H.} and C. Ni and Xiao, {John Q.} and Chien, {C. L.}",

note = "Funding Information: A.K.R. would like to thank Peter Siddons (NSLS) for support and Joseph Dvorak (NSLS) for discussions. Use of the National Synchrotron Light Source, Brookhaven National Laboratory, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886.",

year = "2010",

doi = "10.1063/1.3364137",

language = "English (US)",

volume = "96",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "11",

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TY - JOUR

T1 - Effects of annealing on the local structure of Fe and Co in CoFeB/MgO/CoFeB tunnel junctions

T2 - An extended x-ray-absorption fine structure study

AU - Rumaiz, Abdul K.

AU - Woicik, J. C.

AU - Wang, W. G.

AU - Jordan-Sweet, Jean

AU - Jaffari, G. H.

AU - Ni, C.

AU - Xiao, John Q.

AU - Chien, C. L.

N1 - Funding Information: A.K.R. would like to thank Peter Siddons (NSLS) for support and Joseph Dvorak (NSLS) for discussions. Use of the National Synchrotron Light Source, Brookhaven National Laboratory, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886.

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

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M1 - 112502

ER -

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

Abstract

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