Proximity effects of 20 {} 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 Q pointing along only one 100 direction which depends dramatically on the film thickness tCr. For tCr<250 the SDW propagates out of plane with the spins in the film plane. For tCr>1000 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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Bödeker et al. (1998) studied this question.
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