We measure, as a function of interlayer thickness, the magnitude of the bilinear exchange coupling in an Fe/Au/Fe trilayer, to investigate the existing order of magnitude discrepancy between theory and experiment. We use Fe whisker substrates, scanning electron microscopy polarization analysis, and reflection high-energy electron diffraction to monitor the sample's magnetic and physical structure, and confocal magneto-optical Kerr effect to determine the coupling. We determine the exchange coupling strengths of the individual oscillating terms. The total bilinear coupling strength is -1.9±0.2mJ/m², for a Au interlayer thickness of 4 monolayers, in substantial agreement with current theory.
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Unguris et al. (1997) studied this question.
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