Abstract
The magnetic properties of thin Cr layers in epitaxial [Cr( t Cr)/Sn(2 Å)] ( t Cr=5, 10, 20, 30, and 40 Å) and [Fe(10 Å)/Cr(5 Å)/Sn(2 Å)/Cr(5 Å)] multilayers were studied through 119 Sn conversion electron Mössbauer spectroscopy. It was found that the magnetic ordering temperature of Cr in both Cr/Sn and Fe/Cr/Sn/Cr systems is much higher than the Néel temperature of bulk Cr (i.e. 311 K). It also turned out that the magnetic hyperfine fields at the Sn nuclear sites are quite different, i.e., 11–13 T for the Cr/Sn multilayers and 2 T for the Fe/Cr/Sn/Cr multilayer at 300 K, in spite of the similarity of the local crystallographic structure of the Sn probe layers. Possible magnetic structures of the Cr layers are inferred from the size and direction of the magnetic hyperfine field transferred at the Sn nuclear sites.
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