Inductance measurements are obtained for polycrystalline Gd that exhibit an anomalous giant permeability well below the Curie temperature. It is shown that such an anomaly should occur for a hexagonal, ferromagnetic, polycrystalline material with low basal plane anisotropy (such as Gd) when the direction of easy magnetization departs from the c-axis. If the basal plane anisotropy is neglected, the theoretical weak field permeability is approximately proportional to the sine of the angle between the c-axis and the magnetization vector in a represenative domain. Good agreement is obtained between the observed permeability and the experimental values of this angle based on magnetic anisotropy or neutron diffraction measurements of others. Findings are illustrated graphically. 19 pp. Refs. (KB)
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