Altermagnets Database

Identity

Elements

Fe, O

Space group

${\mathrm{Cmcm}}$ (63)

MAGNDATA IDs

• 0.999
• 0.1000

ICSD IDs

n/a

Parent space group(s) i Parent nonmagnetic space group(s) reported by the MAGNDATA-based symmetry analysis after Spglib standardisation.

${\mathrm{Cmcm}}$ (63)

References

• 10.1038/nchem.2478

Properties

Band gap

0.000 eV

Electronic type

Metallic

Min abundance

56,300 ppm

Spin-splitting metrics

Max SS i Largest spin splitting identified within ±3 eV of the Fermi level in the high-throughput DFT workflow.

0.132 eV

Avg SS i Brillouin-zone average of the largest spin splitting at each sampled k-point in the same energy window.

0.076 eV

FΔ i Fraction of near-Fermi bands and sampled k-space showing appreciable spin splitting after the numerical noise cutoff.

13.9%

Symmetry screening

The summary table shows one row per linked MAGNDATA record and symmetry-precision variant. If a MAGNDATA ID has multiple Spglib symprec values in the source data, it appears on multiple rows. The cards below keep the same expanded per-variant detail view, including wave classification and mismatch metrics.

MAGNDATA ID	Collinearity	Phase	Wave	SYMPREC i Spglib symmetry tolerance symprec, shown as an exponential base-10 value.	BNS (MCIF) i BNS setting indicated in the source MCIF file.	G	H
0.999	Naturally collinear	AM	d	$10^{-5}$	${\mathrm{Cm}^{\prime}\mathrm{c}2_{1}^{\prime}}$ (36.174)	mmm	2/m
0.1000	Noncollinear-derived	AM	d	$10^{-5}$	${\mathrm{P}2_{1}^{\prime}}$ (4.9)	mmm	2/m

MAGNDATA 0.999

$\mathrm{Fe_{4}O_{5}}$

Open entry

Collinearity Naturally collinear

Phase AM

Wave d

BNS (MCIF) i BNS setting indicated in the source MCIF file.

${\mathrm{Cm}^{\prime}\mathrm{c}2_{1}^{\prime}}$ (36.174)

BNS

${\mathrm{Cmc}^{\prime}2_{1}^{\prime}}$ (36.175)

Parent SG

${\mathrm{Cmcm}}$ (63)

SYMPREC i Spglib symmetry tolerance symprec, shown as an exponential base-10 value.

$10^{-5}$

Connecting element

$C_{2z}$

G Laue class

mmm

H Laue class

2/m

Spin-angle mismatch

0.0°

Spin-length mismatch

1.000

Reference links

• 10.1038/nchem.2478

MAGNDATA 0.1000

$\mathrm{Fe_{4}O_{5}}$

Open entry

Collinearity Noncollinear-derived

Phase AM

Wave d

BNS (MCIF) i BNS setting indicated in the source MCIF file.

${\mathrm{P}2_{1}^{\prime}}$ (4.9)

BNS

${\mathrm{Cmc}^{\prime}2_{1}^{\prime}}$ (36.175)

Parent SG

${\mathrm{Cmcm}}$ (63)

SYMPREC i Spglib symmetry tolerance symprec, shown as an exponential base-10 value.

$10^{-5}$

Connecting element

$C_{2z}$

G Laue class

mmm

H Laue class

2/m

Spin-angle mismatch

65.8°

Spin-length mismatch

1.070

Reference links

• 10.1038/nchem.2478

Notes and warnings

• Spglib mcif symmetry mismatch