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Title: Boron migration due to annealing in CoFeB/MgO/CoFeB interfaces: A combined hard x-ray photoelectron spectroscopy and x-ray absorption studies

Abstract

We report the hard x-ray photo-electron spectroscopy (HAXPES) and near edge x-ray absorption fine structure (NEXAFS) of CoFeB|MgO|CoFeB 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.

Authors:
; ; ;
Publication Date:
Research Org.:
BROOKHAVEN NATIONAL LABORATORY (BNL)
Sponsoring Org.:
USDOE SC OFFICE OF SCIENCE (SC)
OSTI Identifier:
1043378
Report Number(s):
BNL-96904-2012-JA
Journal ID: ISSN 0003-6951; APPLAB; R&D Project: LS001; TRN: US1203125
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 99; Journal Issue: 22
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; ANNEALING; BORON; BORON COMPOUNDS; COBALT COMPOUNDS; FINE STRUCTURE; HEATING; IRON COMPOUNDS; MAGNESIUM COMPOUNDS; OXIDATION; SPECTRA; VALENCE; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Rumaiz A. K., Jaye, C., Woicik, J.C., and Wang, W. and Fischer, D.A. Boron migration due to annealing in CoFeB/MgO/CoFeB interfaces: A combined hard x-ray photoelectron spectroscopy and x-ray absorption studies. United States: N. p., 2011. Web. doi:10.1063/1.3662967.
Rumaiz A. K., Jaye, C., Woicik, J.C., & Wang, W. and Fischer, D.A. Boron migration due to annealing in CoFeB/MgO/CoFeB interfaces: A combined hard x-ray photoelectron spectroscopy and x-ray absorption studies. United States. doi:10.1063/1.3662967.
Rumaiz A. K., Jaye, C., Woicik, J.C., and Wang, W. and Fischer, D.A. Mon . "Boron migration due to annealing in CoFeB/MgO/CoFeB interfaces: A combined hard x-ray photoelectron spectroscopy and x-ray absorption studies". United States. doi:10.1063/1.3662967.
@article{osti_1043378,
title = {Boron migration due to annealing in CoFeB/MgO/CoFeB interfaces: A combined hard x-ray photoelectron spectroscopy and x-ray absorption studies},
author = {Rumaiz A. K. and Jaye, C. and Woicik, J.C. and Wang, W. and Fischer, D.A.},
abstractNote = {We report the hard x-ray photo-electron spectroscopy (HAXPES) and near edge x-ray absorption fine structure (NEXAFS) of CoFeB|MgO|CoFeB 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.},
doi = {10.1063/1.3662967},
journal = {Applied Physics Letters},
number = 22,
volume = 99,
place = {United States},
year = {Mon Nov 28 00:00:00 EST 2011},
month = {Mon Nov 28 00:00:00 EST 2011}
}