Magnetic Properties of Fe/Dy Artificial Superstructured Films

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Abstract
Artificial superstructured films composed of two magnetic constituents, Fe and Dy, were prepared by means of alternate deposition in ultrahigh vacuum, and magnetic properties have been studied from Mössbauer spectroscopy and SQUID magnetization measurements. When Fe layers are thinner than 20 Å, the structure is amorphous and the magnetic transition temperature is about 270 K, which agrees with that of amorphous pure Fe. When Fe layers are thicker (e.g. 30 Å) and Dy layers are thinner than 20 Å, a perpendicular magnetic anisotropy becomes significant and the spin direction of Fe changes with temperature.