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: Fe-Co-N (272 entries found)
Displaying 9 entries out of 9 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-2819 Mn2ZnS4 8 56 cubic Fd-3m [227] -0.603 . MP 1.11 0.69 . . . . . . DFT mp-1104162
MMD-2873 MnZnS2 1 4 trigonal P3m1 [156] -0.657 . MP 1.25 0.69 . . . . . . DFT mp-1221502
MMD-2878 MnZnS4 2 12 monoclinic P2_1/c [14] -0.402 . MP 0.17 0.12 . . . . . . DFT mp-1221529
MMD-2879 MnZn4S5 4 40 monoclinic Cm [8] -0.755 . MP 0.50 0.28 . . . . . . DFT mp-1221530
MMD-2880 MnZn4S5 2 20 trigonal P3m1 [156] -0.751 . MP 0.50 0.28 . . . . . . DFT mp-1221533
MMD-2881 MnZn3S4 1 8 trigonal P3m1 [156] -0.737 . MP 0.62 0.35 . . . . . . DFT mp-1221534
MMD-3081 Mn4ZnS8 3 39 trigonal R-3m [166] -0.543 . MP 0.95 0.60 . . . . . . DFT mvc-12340
MMD-3082 Mn4ZnS8 3 39 trigonal R-3m [166] -0.561 . MP 0.89 0.56 . . . . . . DFT mvc-12951
MMD-3083 Mn2ZnS5 2 16 orthorhombic Pmmn [59] -0.337 . MP 0.75 0.44 . . . . . . DFT mvc-12972
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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