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By probing the magnetization profile of high-quality molecular-beam-epitaxy-grown Co/Cu(111) superlattices with spin-polarized neutron reflectivity (SPNR), we have observed a coherent antiferromagnetic spin structure and confirm that this coupling behavior sensitively depends on the Cu spacer thicknesses. We present magneto-optical Kerr-effect data from which the period of the exchange coupling can be determined to be about 9 {}, consistent with theory and the SPNR data. With these results we confirm the existence of an oscillatory exchange coupling in this controversial system.
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Schreyer et al. (1993) studied this question.
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