OSCILLATORY INTERLAYER COUPLING THROUGH (111) ORIENTED NOBLE-METAL SPACERS

We use a surface-sensitive Mossbauer spectroscopy technique to examine the spin-wave spectrum, at the Fe(110)/NM(Ill) interface only, of a m ultilayer structure with a noble metal (NM) interlayer. We find that t he temperature dependence of the hyperfine field follows a Bloch law ( 1-BT3/2), and use spin-wave calculations to connect the surface spin-w ave stiffness parameter, B, to the interlayer exchange coupling. Films grown with Ag(111) interlayers show clear oscillations with a period of 6 ML, in good agreement with recent predictions.