Estimation of Magnetic Domain Size in Chiral Antiferromagnet Mn3Ir by the Anomalous Hall Measurements

Chiral antiferromagnets have recently been drawing attention due to their unique magnetic transport properties such as the giant anomalous Hall effect. We previously reported an experimental demonstration of the giant anomalous Hall effect in the chiral antiferromagnet Mn3Ir thin films with quite blunt hysteresis curves suggesting a large distribution of magnetic properties associated with magnetic domains. In this work, we measured the anomalous Hall effect and its hysteresis curve in the Mn3Ir of various device sizes. By comparing the experimental data with our developed statistical model, we characterize a distribution of the magnetic domain size in our Mn3Ir films.