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Evolution of Structure with Fe Layer Thickness in low Dimensional Fe/Tb Multilayered Structures

  • V. G. Harris (a1), K. D. Aylesworth (a1), W. T. Elam (a1), N. C. Koon (a1), R. Coehoorn (a2) and W. Hoving (a2)...

Abstract

The atomic structure of a series of low-dimensional Fe/Tb multilayered structures has been explored using a conversion-electron, extended x-ray absorption fine structure (EXAFS) technique. A structural transition from a close-packed amorphous structure to a body-centered crystalline structure is detected to occur over an Fe layer thickness range of 12.5 Å to 15.0 Å (Tb thickness is held constant at 4.5 Å). Magnetic properties, specifically, magnetization, anisotropy field, and Kerr rotation angle, are measured and found to change significantly in response to this transition. Exploitation of the polarization properties of synchrotron radiation allowed for the description of the atomic structure both perpendicular and parallel to the sample plane.

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[1] Chen, H. and Heald, S.M., Sol. St. Ionics, 32–33, 924 (1989).
[2] Elam, W.T., Kirkland, J.P., Neiser, R.A., and Wolf, P.D., Phys. Rev. B 38, 26 (1988).
[3] Neiser, R.A., Kirkland, J.P., Elam, W.T., and Sampath, S., Nucl. Instrum. Methods Phys. Res. Sect., A 266, 220 (1988).
[4] Sayers, D.E. and Bunker, B.A., Chapter 6 in X-Ray Absorption: Principles. Applications. Techniques of EXAFS. SEXAFS and XANES. Koningsberger, D.C. and Prins, R. (editors), (John Wiley & Sons, New York), 1988.
[5] see for example: Harris, V.G., Elam, W.T. and Vittoria, C., IEEE Trans. on Magn., 27, 3620(1991), and references contained within.
[6] Theoretical EXAFS data were generated using FEFF codes, for details of theory and fits to experimental data see: Rehr, J.J., Mustre, J., Labinsky, S.I., and Albers, R.C., J. Am. Chem. Soc., 113, 1 (1991).

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