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Effect of the Annealing Temperature on the Electronic and Atomic Structures of Exchange-Biased NiFe–FeMn Bilayers.
- Source :
- Surface Review & Letters; Feb2002, Vol. 9 Issue 1, p293, 6p
- Publication Year :
- 2002
-
Abstract
- In this study we measured the Fe, Mn, and Ni L[sub 2,3]-edge X-ray absorption near-edge structure (XANES) and K-edge extended X-ray absorption fine structure (EXAFS) of the ferromagnetic (FM) NiFe and antiferromagnetic (AFM) FeMn bilayer films prepared with various annealing temperatures. The branching ratios of the white-line intensities in the Fe, Mn, and Ni L[sub 2,3]-edges XANES spectra and consequently the magnetic properties of these exchange-biased FM NiFe — AFM FeMn bilayers are found to depend strongly on the annealing temperature. We find that the first peak in the Fe, Mn, and Ni K-edge EXAFS Fourier transform spectra are very similar, which suggests that the nearest-neighbor bond lengths among Fe, Mn, and Ni atoms are essentially the same in the NiFe-FeMn bilayers. However, the peaks at distances greater than ∼ 3 Å appear to be sensitive to the annealing temperature especially for the Fe and Mn K-edge spectra, which suggests that annealing alters the atomic structures of the next-nearest-neighbor and more distant shells surrounding the Fe and Mn atoms in the NiFe-FeMn bilayers. [ABSTRACT FROM AUTHOR]
- Subjects :
- X-ray absorption near edge structure
THIN films
Subjects
Details
- Language :
- English
- ISSN :
- 0218625X
- Volume :
- 9
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Surface Review & Letters
- Publication Type :
- Academic Journal
- Accession number :
- 7230251
- Full Text :
- https://doi.org/10.1142/S0218625X0200221X