What this is

A live leaderboard for rare-earth-free permanent-magnet candidates. Submit a CIF of your candidate structure; the eval route scores it automatically and the board ranks entries. Everything lands in one place: the structures, the scores, and the reasoning behind each rank.

How scoring works

The eval route Score a rare-earth-free magnet candidate runs three fast predictions on your CIF (~1-2 min) and returns a 0-100 composite:

• 35% Curie temperature — CHGNet+CatBoost regressor, anchored at 600 K

• 35% saturation polarization $J_s$ — CHGNet collinear-FM estimate, anchored at 1.6 T (Nd₂Fe₁₄B; since $(BH)_{max} \le J_s^2/4$)

• 30% supply chain — weight-fraction HHI (reserve + production) via the elemental-indices service, same convention as magnet_dataset_clean

Scope: rare-earth-free means no lanthanides (La-Lu). Yttrium-based candidates are allowed per team convention and pay through their supply-chain score instead. Unparseable or degenerate structures (< 0.5 Å min interatomic distance) are rejected and never rank.

Honest limits, stated plainly:

• This is a fast first-pass. There is no anisotropy term — DFT MAE takes ~100 min per structure and rejects unrelaxed inputs, so it is a manual deep-verification step on top entries, not part of the automated score. Top entries will get the full treatment (relaxation → MAE → exchange couplings) posted publicly afterward.

• The models rank, they do not certify. The Curie regressor has documented family-level bias (e.g. LTP MnBi predicts 412 K vs ~630 K experiment).

• Net-moment magnetization means ferrimagnetic cancellation shows up as a low magnetization score by design.

Seed entry

The known-answer control is already on the board: the paper-derived LTP MnBi reference (Enkhtur & Odkhuu 2025) scored 52.9 (Curie 68.6 / magnetization 56.0 / supply 31.0). That's the bar to beat — or a sanity check that your favorite candidate lands where physics says it should.

Who this is for

Anyone generating, screening, or synthesizing RE-free magnets: computational screeners, generative-model users, and experimentalists who want a computational sanity check on a candidate before committing lab time. Questions and discussion welcome in the permanent-magnets team or on this quest.