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Eu$_5$In$_2$Sb$_6$ is a member of a family of orthorhombic nonsymmorphicrare-earth intermetallics that combines large localized magnetic moments anditinerant exchange with a low carrier density and perpendicular glide planes.This may result in special topological crystalline (wallpaper fermion) or axioninsulating phases. Recent studies of Eu$_5$In$_2$Sb$_6$ single crystals haverevealed colossal negative magnetoresistance and multiple magnetic phasetransitions. Here, we clarify this ordering process using neutron scattering,resonant elastic X-ray scattering, muon spin-rotation, and magnetometry. Thenonsymmorphic and multisite character of Eu$_5$In$_2$Sb$_6$ results in coplanarnoncollinear magnetic structure with an Ising-like net magnetization along the$a$ axis. A reordering transition, attributable to competing ferro- andantiferromagnetic couplings, manifests as the onset of a second commensurateFourier component. In the absence of spatially resolved probes, theexperimental evidence for this low-temperature state can be interpreted eitheras an unusual double-$q$ structure or in a phase separation scenario. The netmagnetization produces variable anisotropic hysteretic effects which alsocouple to charge transport. The implied potential for functional domain physicsand topological transport suggests that this structural family may be apromising platform to implement concepts of topological antiferromagneticspintronics.

Unusual magnetism of the axion-insulator candidate Eu$_5$In$_2$Sb$_6$