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: Cr-As (9 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-79 FeCo7N 2 18 tetragonal P4/nmm [129] 0.008 0.037 AGA search 1.37 1.53 ab plane -0.17 . . . . DFT DOI link
MMD-80 FeCo7N 4 36 cubic F-43m [216] 0.008 0.038 AGA search 1.37 1.53 <111> . . . -0.01 . DFT DOI link
MMD-81 FeCo7N 2 18 orthorhombic Cmmm [65] 0.020 0.049 AGA search 1.40 1.55 a -0.82 -0.80 0.02 . . DFT DOI link
MMD-379 FeCo7N 4 36 cubic F-43m [216] 0.008 0.038 AGA search 1.37 1.53 <111> . . . -0.00 . DFT MS
MMD-384 FeCo7N 2 18 tetragonal P4/nmm [129] 0.008 0.037 AGA search 1.37 1.53 ab plane -0.15 . . . . DFT MS
MMD-396 FeCo7N 2 18 tetragonal P4/nmm [129] 0.008 0.038 AGA search 1.36 1.54 ab plane -0.33 . . . . DFT MS
MMD-397 FeCo7N 4 36 cubic F-43m [216] 0.009 0.038 AGA search 1.36 1.53 <111> . . . -0.01 . DFT MS
MMD-398 FeCo7N 2 18 tetragonal P4_2/mmc [131] 0.010 0.040 AGA search 1.36 1.54 ab plane -0.03 . . . . DFT MS
MMD-485 FeCo7N 2 18 tetragonal P4/nmm [129] 0.008 0.037 AGA search 1.37 1.53 ab plane -0.16 . . . . DFT MS
MMD-486 FeCo7N 4 36 cubic F-43m [216] 0.008 0.038 AGA search 1.37 1.53 <111> . . . -0.01 . DFT MS
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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