Abstract
We have carefully measured the magnetic anisotropy of samples cut from (112) and (110) growth surfaces of flux grown Gd2.34Tb.66Fe5O12. The experimental technique included the use of spherical samples, precision x‐ray orientation, correction for the non‐collinearity of M and H, and the measurement of torque about all 〈110〉 axes. Energy curves were analyzed in terms of the most general second and fourth order terms. We find: 1. The room temperature anisotropy consists only of a cubic K1 term and a growth induced anisotropy quadratic in the direction cosines; 2. Energy surfaces of two distinctly different orientations are needed to describe the growth anisotropy under different areas of the (110) face; and, 3. Characterization of the growth induced anisotropy in terms of the two parameter model is less straightforward than has appeared to date.
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