Magnetization curves of three (Fe/Si/Fe) trilayers. The open circles are data for an (Fe100Å/Si14Å/Fe100Å) film grown directly on glass at +200°C. The filled circles are data on a (Fe100Å/Si14Å/Fe100Å) film grown at +200°C on a 500Å\ a-Si buffer layer on glass. The solid curve is for a (Fe100Å/Si14Å/Fe100Å) film grown at nominal RT on a 500Å a-Si buffer layer on glass. The coupling is stronger in the film grown at high temperature on a buffer than in either of the other two films.