Database statistics:

A total of 3,826 entries, including 300+ Fe-based rare-earth-free magnets discovered through our adaptive genetic algorithm (AGA) searches, are registered in our database. Data statistics are summarized here.

Phase diagrams:

Binary phases: Fe-N (38 entries), Fe-S (45 entries), Fe-Si (47 entries), Co-N (183 entries), Zr-Co (42 entries), among others.
Ternary phases: Fe-Co-N (272 entries), Fe-Co-S (34 entries), Zr-Co-B (50 entries), Zr-Co-C (55 entries), Zr-Co-N (79 entries), among others.

Benchmark test:

Benchmark results are summarized here, where we compare theoretical and experimental values.
random selection: Ni-S (25 entries found)
Displaying 6 entries out of 6 entries found.
Crystallographic data Sstructural stability [Footnotes] Magnetic properties [Footnotes, magnetic units] Methods References
Materials ID Formula Formula units per cell Atomic sites per cell Crystal system Space group [Number] Formation energy (eV/atom) Energy relative to convex hull (eV/atom) Structure search Averaged magnetic moment (μB/atom) Magnetic polarization, Js (T) Magnetic easy axis Magnetic anisotropy constants:
Ka-c, Kb-c, Kb-a, Kd-a (MJ/m3)		 Curie temperature, TC (K) Methods References
MMD-140 Co6N 1 7 trigonal P-31m [162] 0.082 0.082 AGA search 1.24 1.41 c 0.54 . . . . DFT DOI link
MMD-1207 Fe2N 3 9 trigonal P-31m [162] -0.028 0.061 MP 0.98 1.22 ab plane -1.47 . . . . DFT mp-248
MMD-1212 Fe12N5 2 34 trigonal P-31m [162] -0.052 0.027 MP 1.23 1.47 ab plane -1.54 . . . . DFT mp-27908
MMD-2591 Mn4FeGe3 2 16 trigonal P-31m [162] -0.092 . MP 1.62 1.40 ab plane -0.35 . . . . DFT mp-1222161
MMD-3559 Mn2Fe(CN)6 1 15 trigonal P-31m [162] 0.116 . MP 0.67 0.57 ab plane -0.32 . . . . DFT mp-567650
MMD-3736 Cr2N 3 9 trigonal P-31m [162] -0.410 0 (stable) MP 0.00 0.00 . . . . . . DFT mp-8780
Footnotes:
  1. Formation energy:
    We perform DFT calculations to calculate the total enegies of all the structures. The formation energy is computed with respect to a linear combination of the total energies of reference elemental phases. When the formation energies are plotted as a function of chemical composition, a set of stable compounds forms a convex hull, which represents a boundary (theoretical lower limit) in a compositional phase diagram. Metastable compounds lie above the hull, and the energy relative to the hull (distance to the hull) is a useful quantity to examine the metastability of a new compound. The lower the formation energy above the convex hull, the more likely it is for the material to exist.
  2. Magnetic anisotropy constants:
    Magnetic anisotropy constant, Ka-c, is defined as Ka-c = Ea-Ec, where Ea and Ec are the total energies per volume for the magnetization oriented along the crystallographic a and c axes, respectively. Similarly, Kb-c and Kb-a are defined as Kb-c = Eb-Ec and Kb-a = Eb-Ea, respectively. For cubic crystal systems, magnetic anisotropy constant is calculated as Kd-a = Ed-Ea, where Ed is the total energy per volume for the magnetization oriented along the body-diagonal direction of the unit cell.
Collaborative PIs:
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