Abstract
The composition dependence of magnetic properties in ultrafine (Fe1−x Nix )76 Si8 B16 amorphous particles has been investigated. Samples were prepared by sputter deposition onto sputter-etched polyimide substrates. The particle diameter was held constant at about 800 Å, and the L/D ratio was approximately 4. The room-temperature saturation magnetization (Ms ) decreases with increasing Ni content and extrapolates to zero at about x=0.9. All the samples showed positive anisotropy (Ku ). This anisotropy varied linearly with M2s, suggesting that its origin is largely the shape anisotropy of the particles. Furthermore, the measured perpendicular coercive field varied linearly with Ku /Ms , as predicted by a simple Stoner–Wohlfarth single domain model. However, the absolute value of Hc and its angular dependence cannot be explained by the coherent rotation model.
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