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 10 entries out of 10 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-938 MnZn 1 2 hexagonal P-6m2 [187] 0.177 0.190 MP 1.19 1.04 ab plane -1.05 . . . . DFT mp-1221543
MMD-916 MnZn 1 2 cubic Pm-3m [221] 0.077 0.090 MP 1.46 1.26 a . . . 0.01 . DFT mp-11503
MMD-937 MnZn3 1 4 hexagonal P-6m2 [187] 0.064 0.083 MP 0.61 0.51 ab plane -1.13 . . . . DFT mp-1221532
MMD-931 MnZn13 2 28 monoclinic C2/m [12] -0.018 0 (stable) MP 0.12 0.10 . . . . . . DFT mp-1210567
MMD-917 MnZn3 1 4 cubic Pm-3m [221] -0.019 0 (stable) MP 0.69 0.57 a . . . 0.00 . DFT mp-11504
MMD-941 MnZn3 3 12 trigonal R-3m [166] 0.095 0.114 MP 0.74 0.60 ab plane -1.06 . . . . DFT mp-1221570
MMD-920 Mn3Zn 4 16 cubic Fm-3m [225] 0.204 0.211 MP 1.28 1.21 <111> . . . -0.80 . DFT mp-1185979
MMD-932 MnZn13 2 28 monoclinic C2/m [12] 0.073 0.091 MP 0.25 0.19 . . . . . . DFT mp-1210582
MMD-1020 Mn3Zn 2 8 tetragonal I4/mmm [139] 0.213 0.219 MP 0.89 0.88 ab plane -2.64 . . . . DFT mp-973181
MMD-1023 MnZn3 2 8 hexagonal P6_3/mmc [194] -0.010 0.010 MP 0.79 0.65 c 0.12 . . . . DFT mp-975079
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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