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: Mn-Fe-As (3 entries found)
Displaying 21 entries out of 21 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-188 Fe3Ge 4 16 orthorhombic Cmcm [63] -0.025 0.077 AGA search 1.55 1.49 a -0.09 0.32 0.41 . . DFT MS
MMD-189 Fe3Ge 2 8 hexagonal P6_3/mmc [194] -0.093 0.009 AGA search 1.60 1.55 ab plane -0.31 . . . . DFT MS
MMD-190 Fe3Ge 1 4 cubic Pm-3m [221] -0.097 0.004 AGA search 1.60 1.55 <111> . . . -0.00 . DFT MS
MMD-191 Fe3Ge 4 16 cubic Fm-3m [225] -0.102 0.000 AGA search 1.36 1.36 a . . . 0.00 . DFT MS
MMD-1089 FeGe3 2 8 hexagonal P6_3/mmc [194] 0.424 0.485 MP 0.59 0.41 ab plane -0.27 . . . . DFT mp-1184472
MMD-1107 Fe7Ge4 2 22 hexagonal P6_3/mmc [194] -0.072 0.039 MP 1.21 1.11 ab plane -0.31 . . . . DFT mp-1212970
MMD-1147 Fe3Ge2 1 5 hexagonal P-6m2 [187] -0.070 0.043 MP 1.14 0.97 ab plane -0.50 . . . . DFT mp-1225197
MMD-1151 Fe3Ge2 1 5 trigonal P-3m1 [164] 0.014 0.128 MP 1.02 0.87 ab plane -0.59 . . . . DFT mp-1225239
MMD-1152 Fe7Ge4 1 11 hexagonal P-6m2 [187] -0.057 0.054 MP 1.17 1.05 ab plane -0.34 . . . . DFT mp-1225358
MMD-1181 Fe3Ge 1 4 cubic Pm-3m [221] -0.097 0.005 MP 1.60 1.56 a . . . 0.01 . DFT mp-20344
MMD-1183 Fe2Ge 2 6 hexagonal P6_3/mmc [194] -0.030 0.079 MP 1.31 1.24 ab plane -0.90 . . . . DFT mp-20432
MMD-1184 Fe3Ge 4 16 cubic Fm-3m [225] -0.102 0 (stable) MP 1.42 1.39 a . . . 0.00 . DFT mp-20711
MMD-1190 Fe3Ge 2 8 hexagonal P6_3/mmc [194] -0.093 0.009 MP 1.60 1.55 ab plane -0.27 . . . . DFT mp-21078
MMD-1191 FeGe2 4 12 tetragonal I4/mcm [140] -0.061 0.020 MP 0.40 0.33 ab plane -1.52 . . . . DFT mp-21117
MMD-1192 FeGe 4 8 cubic P2_13 [198] -0.091 0.031 MP 0.53 0.48 <111> . . . -0.00 . DFT mp-21255
MMD-1200 FeGe 3 6 hexagonal P6/mmm [191] -0.122 0 (stable) MP 0.66 0.53 c 0.47 . . . . DFT mp-22478
MMD-1201 FeGe 8 16 monoclinic C2/m [12] -0.099 0.023 MP 0.72 0.61 a -0.98 0.11 1.08 . . DFT mp-22510
MMD-1231 Fe2Ge 1 3 hexagonal P6/mmm [191] 0.226 0.335 MP 1.67 1.48 c 2.22 . . . . DFT mp-568258
MMD-1243 Fe13Ge3 1 16 cubic Pm-3m [221] -0.077 0 (stable) MP 1.68 1.67 a . . . 0.00 . DFT mp-601833
MMD-1250 Fe6Ge5 4 44 monoclinic C2/m [12] -0.087 0.031 MP 0.85 0.77 b 0.66 -0.24 -0.91 . . DFT mp-636946
MMD-1251 FeGe2 16 48 orthorhombic Cmce [64] 0.002 0.083 MP 0.00 0.00 . . . . . . DFT mp-640708
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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