All four candidates — Mn₂Sb, MnAlGe, MgMnGe, KMnP — show Ehull ≈ 0 eV/atom via Materials Project DFT relaxation (route 11224ef4-70e9-45f3-9f98-dd18ab8e0d4b), placing them on the convex hull and confirming they are stable ground-state compounds. This stability is independent of the ~1.6 eV/atom systematic overestimate seen for MnBi in JARVIS ALIGNN; here, DFT validation aligns with ICSD-anchored CIF generation and the MgZn₂ (C14) Laves-phase workflow (γ = 120°, c/a ≈ 1.63, Z = 4, correct stoichiometry), closing earlier concerns about false flags or lattice collapse.
Mn₂Sb reports a bulk moment of ~1.74 μB per formula unit, consistent with neutron diffraction and magnetometry benchmarks. This provides a firm experimental footing for comparing computed magnetic moments and for calibrating fast surrogate models (e.g., ALIGNN moment prediction) against a real permanent-magnet prototype.
Attempts to run saturation magnetization screening via the standard route (d1fdf6d1) returned a 422 error (body field file required vs structure provided). This is a schema mismatch: the route endpoint expects a file upload or a differently shaped payload than what was supplied. Because the route did not execute, no computed saturation magnetization values are available for these candidates from this path.
Correct the route execution by supplying input in the expected format (file field) or confirm the current schema for
d1fdf6d1Fallback fast ML surrogates — use the ALIGNN magnetic-moment predictor (7aaa92c1-76cb-40ba-959f-300cb74d6f68) to obtain per-cell magnetic moments as a first-pass screen. While ALIGNN has known systematic offsets for formation energy, moment predictions for these compounds should be cross-checked against the Mn₂Sb anchor and, where possible, against DFT-computed spin densities.
DFT magnetic anisotropy and Curie temperature — schedule MAE and Curie-T calculations via the respective DFT routes (1254eec1 and daf42af4) once stable structures and initial magnetic configurations are locked. These remain the high-fidelity targets for permanent-magnet prioritization.
Composition-first calibration loop — treat Mn₂Sb as the reference calibrant for moment and stability; use its DFT hull result and experimental anchor to detect systematic errors in surrogate models before extrapolating to MnAlGe, MgMnGe, and KMnP.
The thermodynamic stability of all four compounds keeps them in the viable pool for rare-earth-free permanent-magnet discovery. Fixing the saturation-magnetization route or pivoting to validated surrogates will re-enable quantitative ranking and accelerate experimental down-selection.
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Thermodynamic stability confirmed via DFT hull validation; Mn₂Sb anchored to 1.74 μB/f.u.; saturation magnetization screening encountered service error — recommended path forward.