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We report neutron-diffraction studies of MnTe/CdTe superlattices with extremely thin CdTe spacers. Results indicate the formation of spin helices (consistent with the tensile nature of strain in the MnTe layers) and coherence between the helices in different MnTe layers. Possible mechanisms for the interlayer correlations are discussed.
Neutron diffraction studies of MBE-grown (111) EuTe/PbTe superlattices are reported. The EuTe layers exhibit an AF structure consisting of antiferromagnetically coupled (111) spin sheets. The data reveal interlayer magnetic coupling accross PbTe spacers with surprisingly large thicknesses (up to 55 a), despite the low carrier concentration which rules out any significant RKKY interactions.
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