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      Journal of Applied Physics -- December 1, 1995 -- Volume 78, Issue
      11, pp. 6670-6678

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      Interlayer exchange coupling in epitaxial Fe/Cr/Fe/Ag/GaAs(100)
      structures

    R. J. Hicken, C. Daboo, M. Gester, A. J. R. Ives, S. J. Gray, and J.
    A. C. Bland The Cavendish Laboratory, University of Cambridge,
Madingley Road, Cambridge CB3 0HE, United Kingdom

(Received 9 June 1995; accepted 10 August 1995)

The interlayer exchange coupling has been investigated in epitaxial
Fe(20 Å)/Cr/Fe(20 Å)/Ag/GaAs(100) structures that contain a wedge-shaped
(0?40 Å) Cr layer. Longitudinal and polar magneto-optical Kerr-effect
(MOKE) and Brillouin light-scattering measurements have been combined to
determine values for the relevant anisotropy constants and both the
bilinear and biquadratic coupling strengths. The phase and period of the
oscillations in the interlayer coupling are found to agree well with
those reported by other researchers while the total coupling strength is
found to be reduced. This reduction is presumably due to the presence of
structural imperfections in our samples, and our results may therefore
be of use in testing some of the recently proposed extrinsic biquadratic
coupling mechanisms. Specifically, we find that for the Cr thicknesses
studied the biquadratic coupling strength in our samples varies as
d<sup> - 1.4</sup><sub>Cr</sub> where dCr is the thickness of the Cr
layer. We also present results that show how the ultrathin Cr limit may
be investigated. We show that the coercivity of the easy axis MOKE loops
is sensitive to submonolayer coverages of Cr and that polar MOKE is
sensitive to the strong ferromagnetic coupling found in the 0?4 Å Cr
thickness range. ©1995 American Institute of Physics.


doi: <http://ojps.aip.org/jhtml/doi.jsp>10.1063/1.360488
PACS: 75.70.Fr, 78.20.Ls, 78.35.+c        Additional Information
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