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

Author

Listed:
  • 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)

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.

Suggested Citation

  • 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 & Z. H. Mai, 2002. "EFFECT OF THE ANNEALING TEMPERATURE ON THE ELECTRONIC AND ATOMIC STRUCTURES OF EXCHANGE-BIASED NiFe–FeMnBILAYERS," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 9(01), pages 293-298.
    • Handle: RePEc:wsi:srlxxx:v:09:y:2002:i:01:n:s0218625x0200221x
    DOI: 10.1142/S0218625X0200221X
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