Abstract
The magnetic and optical anisotropies observed in oblique-incidence Permalloy films show anomalous behavior for incidence angles greater than 60° (grazing incidence). In particular, the easy axis and the direction of greatest optical absorption are parallel to the vapor beam for incidence angles greater than about 70°, while they are perpendicular to this direction for smaller angles. The anomalies for grazing-incidence films are caused by a shape anisotropy differing from that previously found in lower angle oblique-incidence films. This new shape anisotropy is attributed to the elongation in the beam direction of the particles composing the crystallite chains which are found in all oblique-incidence films; such shape anisotropy has been directly observed by electron microscopy.
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