OSCILLATORY EXCHANGE COUPLING OF FERROMAGNETICALLY ALIGNED FE(110) LAYERS THROUGH AG(111) INTERLAYERS

The interlayer exchange coupling in Fe(110)/Ag(111) multilayer structu res with parallel alignment of the Fe layer magnetizations has been in vestigated with a zero-field Mossbauer spectroscopy technique that is sensitive only to the spin-wave spectrum at the Fe/Ag interface. Model spin-wave calculations are presented to connect the coupling strength to the observed interfacial spin-wave behavior. As the Ag thickness w as varied from 0 to 40 ML (monolayers), the interfacial spectra of the films showed oscillations in the coupling strength with a period of 6 ML, in close agreement with recent predictions.