Large anomalous Hall magnetoresistance in partially oxidized single GdO layer

This study investigated angular-dependent magnetoresistance in a partially oxidized single GdO _x wire, wherein nonmetallic conduction was dominant. The resistivity with magnetic field being parallel ( ρ x ), transverse ( ρ y ), and perpendicular ( ρ z ) to current exhibited a relation of ρ z > ρ x ≈ ρ y , which is in contrast to that in case of conventional magnetoresistances. This unusual angular dependence can be attributed to the anomalous Hall magnetoresistance (AHMR), which is a novel magnetoresistance originating from anomalous Hall effect-induced spin accumulation, subsequent spin backflow, and spin-to-charge conversion, and was recently observed in metallic ferromagnets. The observed AHMR was as large as 1.5% at T = 5 K, which is orders of magnitude larger than that in case of metallic systems. Thus, the findings of this study are expected to motivate the evolution of further theoretical approaches towards a complete understanding of spin-dependent magnetotransport in granular systems.