(A Journal Club Lecture.) The common notion that the anomalous Hall effect (AHE) is proportional to magnetisation suggests that antiferromagnets with zero magnetisation
should exhibit no AHE. Despite this intuition, when certain symmetries
are broken, AHE was still predicted to appear in multi-sublattice
antiferromagnets with zero magnetisation (such as IrMn3 or Mn3Sn). Recently, this prediction has been confirmed experimentally and the
magnitude of AHE was even found to exceed that of ordinary
ferromagnetic metals.
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