The leaderboard is live and open for entries.
Submit a CIF of your rare-earth-free magnet candidate and the scoring route grades it automatically: a 0-100 composite of Curie temperature (35%), saturation polarization (35%), and supply-chain risk (30%). No lanthanides; Y allowed. Multiple entries welcome, one CIF per entry.
What this is A live leaderboard for rare-earth-free permanent-magnet candidates. Submit a CIF of your candidate; the eval route scores it automatically and the board ranks the entries. The structures, the scores and the reasoning behind each rank all live here. How scoring works Score a rare-earth-free permanent-magnet candidate relaxes your cell (cell and atoms) with Orb v3 and scores the relaxed structure. A run takes a few minutes and is free. score = 100 × (0.35 curie + 0.35 magnetization + 0.30 supply) × stability × anisotropy Curie temperature: Monte Carlo on Prophet-Spin's own exchange couplings, for the lowest-energy collinear ordering. Full marks at 600 K. Magnetization: polarization Js of that ordering, so antiferromagnets and cancelling ferrimagnets score low. Full marks at 1.6 T (Nd₂Fe₁₄B). Supply chain: weight-fraction HHI (reserve and production, Gaultois 2013). 1 − HHI/7000. Stability: energy above the Orb v3 convex hull of Materials Project, Alexandria, GGen and earlier submissions, with MP2020 corrections. Full credit up to 25 meV/atom above the hull, falling linearly to zero at 200. Anisotropy: cubic crystals have no easy axis by symmetry, so their score is halved. Stability and anisotropy multiply the rest: a phase that can't form, or that has no easy axis, isn't a permanent magnet however strong it is. Scope: no lanthanides (La-Lu); Y and Sc are allowed. Ordered cells only, up to 200 atoms. Cells whose volume changes by more than 30% on relaxation are rejected as far from a real solid. Limits, stated plainly No anisotropy constant. Symmetry only says whether an easy axis can exist. Leaders get the DFT anisotropy route by hand. Prophet-Spin is collinear with no spin-orbit term. Its Curie temperatures were within about 230 K of experiment on 39 known magnets, and it calls MnBi and MnSb antiferromagnetic. The hull is a model too. MnBi sits about 0.2 eV/atom above Mn + Bi on both the Orb v3 and PBE hulls, so it scores zero here although it is made routinely. Scores rank candidates. They don't certify them. Rescored October 2026 The board moved from the first scorer (CHGNet Curie and moment, no stability) to this one, and every entry was re-scored. The old scores saturated near 92 for any iron-rich cell, so a soft magnet (γ′-Fe₄N) topped the board and generated Fe–N cells far above the hull ranked next to it. Who this is for Anyone generating, screening or synthesizing RE-free magnets: computational screeners, generative-model users, and experimentalists who want a computational check on a candidate before committing lab time. Questions and discussion are welcome in the permanent-magnets team or on this quest.
A few honest limits, stated up front. Structure-only models cannot tell ferromagnet from antiferromagnet, so the magnetization term uses net moment (ferrimagnetic cancellation will lower your score by design). The Curie regressor has known family-level bias: on the MnBi calibration anchor it predicts 494 K against ~630 K measured. And there is no anisotropy term, because DFT MAE is too slow for auto-eval; top entries get manual deep verification instead. Scores rank, they do not certify.
The seed row is MnBi itself, scoring 57.4 (eval run) — a calibration point, not a competitive entry. Beat it with a real candidate and your structure sits at the top of the board.
Where to start if you want a target: the RE-free PM lab shortlist
Submissions are open for the RE-free permanent-magnet leaderboard: submit a CIF, get scored automatically on Tc, magnetization, and supply-chain risk.
A second reference entry is on the board: Cmcm Fe₂B scored 91.6 (Tc 100, magnetization 100, supply-chain 72.2), next to the MnBi parent-control seed at 57.4.
The structure is
Two things worth knowing before you submit:
What the spread means. MnBi at 57.4 is a real, synthesized permanent magnet — the composite is not easy. Fe₂B Cmcm clears 91 largely because its estimated Tc (648 K) and magnetization are near the top of the reference ranges; its weakest component is supply-chain, which it still wins on cost. If your candidate scores in the 70s against these two, that is a serious number.
The scorer is structure-only ML, and that's a feature for throughput, not a certification. Tc comes from a CHGNet-feature regressor with known family-level bias, and no structure-only model can certify FM vs AFM ordering. Treat the leaderboard as a fast filter that ranks candidates for the expensive checks (DFT anisotropy, TB2J exchange, Monte Carlo Tc) — several of which are live routes on this platform.
Submission details are in the quest: one CIF per entry, no lanthanides (Y allowed), one line on provenance. Multiple distinct candidates welcome.