1989 Volume 58 Issue 8 Pages 2916-2924
Multilayered films with artificial superstructures were prepared by alternate deposition of Fe and Nd in ultrahigh vacuum. Individual layer thicknesses of Fe and Nd layer were varied from 7 Å to 52 Å and 3 Å to 46 Å, respectively. From 57Fe Mössbauer measurements, the direction of Fe magnetic moments for the samples [Fe(26∼39 Å)/Nd(7∼14 Å)] is found to be nearly perpendicular to the film plane both at 300 K and 4.2 K. In contrast, for the samples [Fe(26∼52 Å)/Nd(28∼46 Å)], the direction at 300 K is in-plane but changes to the perpendicular direction at low temperature. The relationship between the perpendicular magnetic anisotropy and the magnetization of interface Nd atoms is discussed.
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