We examine the magnetic and electrical transport properties of the hexagonal ${\mathrm{EuIn}}_2{\mathrm{As}}_2$ compound, combining experimental and theoretical results. This compound is predicted to be an axion insulator from an electronic point of view and an altermagnet in the collinear magnetic phase. However, experiments indicate that the Fermi level lies within the valence band rather than in the topological gap, potentially leading to the dominance of magnetic properties. Our detailed studies on magnetization and electrical transport support the presence of a broken-helix antiferromagnetic state, which was previously identified by x-ray and neutron diffraction experiments. Notably, we observed within that state a field-induced metamagnetic transition marked by a large hysteresis in magnetoresistance, which turns into a sharp upturn for the magnetic field tilted by ${15}^{\circ }$ from the $c$ axis of the crystal. Combined with theoretical calculations, it is explained that the application of a magnetic field changes the low-resistivity antiferromagnetic domain walls to the high-resistivity domain walls due to the reduction in the Fermi surface sheets interaction area in the domain walls, originating from $p$ orbitals of As. ${\mathrm{EuIn}}_2{\mathrm{As}}_2$, therefore, presents a new case study that broadens the understanding of complex magnetic structures and their influence on electrical transport.

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• Anomalous Hall effect
• Magnetic susceptibility
• Magnetism
• Magnetoresistance
• Density functional calculations
• Resistivity measurements