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No Access Published Online: 04 June 1998

  • Evidence for “loose spins” in epitaxial Al/Fe/Al

Journal of Applied Physics 81, 5352 (1997); https://doi.org/10.1063/1.364543
C. J. Gutierrez and R. Selestino
  • Department of Physics, Southwest Texas State University, San Marcos, Texas 78666
    • R. A. Mayanovic
  • Department of Physics and Astronomy, Southwest Missouri State University, Springfield, Missouri 65804
    • G. A. Prinz
  • Naval Research Laboratory, Washington, DC 20375
    • more...View Contributors
    • C. J. Gutierrez
    • R. Selestino
    • R. A. Mayanovic
    • G. A. Prinz
    ABSTRACT
    Polarization-dependent Fe K-edge x-ray absorption fine structure measurements of an Al/Fe/Al(001) trilayer reveal a small tetragonal distortion of the Fe sites with c=2.863 Å (normal to the film plane) and a=2.874 Å (in the film plane). This tetragonal distortion is consistent with the formation of Fe1−xAlx alloys in the vicinity of the roughened Fe–Al trilayer interfaces, and agrees with grazing incidence x-ray reflectivity and magnetometry measurements of the trilayer. The deduced alloyed/roughened interfacial regions are the likely source of Fe “loose spins” as recently suggested by Slonczewki’s biquadratic coupling model for the epitaxial Fe/Al/Fe system.

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    1. © 1997 American Institute of Physics.

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