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Magnetic domain walls are boundaries between regions with different configurations of the same magnetic order. In a magnetic insulator, where the magnetic order is tied to its bulk insulating property, it has been postulated that electrical properties are drastically different along the domain walls, where the order is inevitably disturbed. Here we report the discovery of highly conductive magnetic domain walls in a magnetic insulator, Nd 2 Ir 2 O 7 , that has an unusual all-in-all-out magneticdoi:10.1126/science.aac8289 pmid:26516280 fatcat:pznhosic5negdpiw7ohvyt4zka