Materials Project GGA structure of Gd2Fe17 (hexagonal variant; the rhombohedral R-3m polymorph mp-581734 is 0.3 meV/atom higher in MP). Ferrimagnet, Gd antiparallel to Fe.
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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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