The interlayer coupling in Co/Rh/Co sandwiches prepared by UHV evaporation has been investigated by means of magnetization and transport experiments. We found that the antiferromagnetic coupling strength for thin Rh layers is the largest ever obtained in magnetic systems, reaching approximately 34 erg/cm 2 for 5 Å thick Rh interlayer. This value is 7 to 8 times larger than the highest value previously observed in the Co/Ru system prepared under similar conditions. This unexpectedly large difference in the coupling strength between these two systems is mainly due to the magnetic nature of the interfaces. This is further supported by ab initio calculations of the magnetic moments in superlattices with mixed interfaces.
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Zoll et al. (1997) studied this question.
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