Boron migration due to annealing in CoFeB/MgO/CoFeB interfaces

A combined hard x-ray photoelectron spectroscopy and x-ray absorption studies

Abdul K. Rumaiz, C. Jaye, J. C. Woicik, Weigang Wang, D. A. Fischer, J. Jordan-Sweet, C. L. Chien

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We report the hard x-ray photo-electron spectroscopy (HAXPES) and near edge x-ray absorption fine structure (NEXAFS) of CoFeBMgOCoFeB interfaces as a function of annealing time. Upon annealing, the oxidation state of B changes from predominantly elemental (0 valence) boron in the as deposited sample to higher oxidation in annealed samples as evident from HAXPES spectra. The NEXAFS spectroscopy results showed that upon heating, B species migrate towards the MgO and interact with it. A comparison of the tunnel junction NEXAFS signature with some standards suggests that the B forms a 3-fold coordinated boron compound in the MgO environment and 4-fold coordinated boron resembling Kotoite mineral in the CoFe/MgO interface.

Original languageEnglish (US)
Article number222502
JournalApplied Physics Letters
Volume99
Issue number22
DOIs
StatePublished - Nov 28 2011
Externally publishedYes

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x ray absorption
x ray spectroscopy
boron
fine structure
photoelectron spectroscopy
annealing
boron compounds
oxidation
tunnel junctions
minerals
signatures
valence
heating
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Boron migration due to annealing in CoFeB/MgO/CoFeB interfaces : A combined hard x-ray photoelectron spectroscopy and x-ray absorption studies. / Rumaiz, Abdul K.; Jaye, C.; Woicik, J. C.; Wang, Weigang; Fischer, D. A.; Jordan-Sweet, J.; Chien, C. L.

In: Applied Physics Letters, Vol. 99, No. 22, 222502, 28.11.2011.

Research output: Contribution to journalArticle

Rumaiz, Abdul K. ; Jaye, C. ; Woicik, J. C. ; Wang, Weigang ; Fischer, D. A. ; Jordan-Sweet, J. ; Chien, C. L. / Boron migration due to annealing in CoFeB/MgO/CoFeB interfaces : A combined hard x-ray photoelectron spectroscopy and x-ray absorption studies. In: Applied Physics Letters. 2011 ; Vol. 99, No. 22.
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