A microscopic magnetic antiphase domain structure has been observed in a single-crystal Gd-Y superlattice by neutron diffraction. Furthermore, this long-range antiferromagnetic correlation is found to occur in a multibilayer, in which each biiayer consists of A^od ferromagnetic atomic planes of Gd followed by N^ planes of nonmagnetic Y, for NY = NQ^ = 10 but not for A^y == 6 or 20. This oscillatory behavior is consistent with recent theoretical speculation that the Gd moments are coupled through the intervening Y via the Ruderman-Kittel-Kasuya-Yosida interaction.
Magnetic susceptibility, electrical resistivity, Mössbauer effect (ME) and transmission electron microscopy measurements in single crystals of the metal intercalated layer compounds FexTaS2 (0.20⩽x⩽0.34) are reported. The compounds are metallic, ferromagnetic and have large coercive force. ME measurements show the iron to be high-spin Fe2+, with a distribution of hyperfine fields at low temperatures. Transmission electron microscopy suggests the existence of clusters. These results may explain the diversity of magnetic preperties on nonstoichiometric intercalated compounds such as FexTaS2.
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