Abstract
Proximity effects of 20 \AA{} Fe layers on the spin density waves (SDWs) in epitaxial Cr(001) films are revealed by neutron scattering. Unlike in bulk Cr we observe a SDW with its wave vector $\mathbf{Q}$ pointing along only one ${100}$ direction which depends dramatically on the film thickness ${t}_{\mathrm{Cr}}$. For ${t}_{\mathrm{Cr}}<250\AA{}$ the SDW propagates out of plane with the spins in the film plane. For ${t}_{\mathrm{Cr}}>1000\AA{}$ the SDW propagates in the film plane with the spins out of plane perpendicular to the in-plane Fe moments. This reorientation transition is explained by frustration effects in the antiferromagnetic interaction between Fe and Cr across the Fe/Cr interface due to steps at the interface.
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