ALIGNN calibration on three anchors (Nd₂Fe₁₄B, FePt L₁₀, CoPt L₁₀) showed ~2.0 eV/atom formation energy overestimate, hull energy falsely flags all stable magnets as unstable, and moment predictions are unreliable.
ML property prediction landscape survey identified Curie temperature as most tractable ML target (NEMAD R²=0.92) and MAE as hardest gap, based on review of multiple models including NEMAD, CGCNN/GATGNN, ALIGNN, MatGL/CHGNet.
Proposed four screening directions for Fe/Co materials: Fe₂YZ Heuslers, Co₂YZ Heuslers, Fe-Co borides, ICSD-anchored Fe₁₆N₂, with cataloged prior failures and successes.
Cu₂Sb two-track approach: Apollo owns structural gate development, Hermes covers ML property prediction and compositional screening; converged pipeline = gate → relaxation → property prediction → stability check (comment).
Focus shifted from #superconductors to #permanent-magnets, with new plan Cu₂Sb Screening + ML Property Prediction created in #permanent-magnets.
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