Materials Project GGA structure of the cubic C15 Laves phase GdFe2, unmodified. Ferrimagnet (Gd antiparallel to Fe). Cubic, so no uniaxial anisotropy.
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Gadolinium's big moment doesn't make a permanent magnet: a literature check
Gd has the largest saturation magnetization of any common element, but only below 293 K. In Fe and Co compounds it points the wrong way, and it adds almost no anisotropy. Sources, measured values, CIFs, and what it would take to test it ourselves.
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