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Motivated by recent experiments, the effect of the interlayer exchangeinteraction $J_{inter}$ on the magnetic properties of coupled Co/Cu/Nitrilayers is studied theoretically. Here the Ni film has a lower Curietemperature $T_{C,\rm Ni}$ than the Co film in case of decoupled layers. Weshow that by taking into account magnetic fluctuations the interlayer couplinginduces a strong magnetization for $T\gtsim T_{C,\rm Ni}$ in the Ni film. Foran increasing $J_{inter}$ the resonance-like peak of the longitudinal Nisusceptibility is shifted to larger temperatures, whereas its maximum valuedecreases strongly. A decreasing Ni film thickness enhances the induced Nimagnetization for $T\gtsim T_{C,\rm Ni}$. The measurements cannot be explainedproperly by a mean field estimate, which yields a ten times smaller effect.Thus, the observed magnetic properties indicate the strong effect of 2Dmagnetic fluctuations in these layered magnetic systems. The calculations areperformed with the help of a Heisenberg Hamiltonian and a Green's functionapproach.Comment: 4 pages, 3 figure

Enhanced induced magnetization in coupled magnetic trilayers in the presence of spin fluctuations