EFFECT OF THE ANNEALING TEMPERATURE ON THE ELECTRONIC AND ATOMIC STRUCTURES OF EXCHANGE-BIASED NiFe–FeMnBILAYERS

J. M. Lee, J. C. Jan, J. W. Chiou, W. F. Pong, M.-H. Tsai, Y. K. Chang, Y. Y. Chen, C. R. Wang, J. F. Lee, T. Yang, Z. Lu, W. Y. Lai and Z. H. Mai
Additional contact information
J. M. Lee: Department of Physics, Tamkang University, Tamsui 251, Taiwan, R.O.C
J. C. Jan: Department of Physics, Tamkang University, Tamsui 251, Taiwan, R.O.C
J. W. Chiou: Department of Physics, Tamkang University, Tamsui 251, Taiwan, R.O.C
W. F. Pong: Department of Physics, Tamkang University, Tamsui 251, Taiwan, R.O.C
M.-H. Tsai: Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan, R.O.C
Y. K. Chang: Institute of Physics, Academia Sinica, Taipei 107, Taiwan, R.O.C
Y. Y. Chen: Institute of Physics, Academia Sinica, Taipei 107, Taiwan, R.O.C
C. R. Wang: Institute of Physics, Academia Sinica, Taipei 107, Taiwan, R.O.C
J. F. Lee: Synchrotron Radiation Research Center, Hsinchu 300, Taiwan, R.O.C
T. Yang: Institute of Physics, Chinese Academy of Science, Beijing, China
Z. Lu: Institute of Physics, Chinese Academy of Science, Beijing, China
W. Y. Lai: Institute of Physics, Chinese Academy of Science, Beijing, China
Z. H. Mai: Institute of Physics, Chinese Academy of Science, Beijing, China

Surface Review and Letters (SRL), 2002, vol. 09, issue 01, 293-298

Abstract: In this study we measured the Fe, Mn, and NiL2,3-edge X-ray absorption near-edge structure (XANES) andK-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 NiL2,3-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 NiK-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 MnK-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.

Date: 2002
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DOI: 10.1142/S0218625X0200221X

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