Large anomalous Hall magnetoresistance in partially oxidized single GdOx layer

Abstract

This study investigated angular-dependent magnetoresistance in a partially oxidized single GdOx wire, wherein nonmetallic conduction was dominant. The resistivity with magnetic field being parallel (ρx), transverse (ρy), and perpendicular (ρz) to current exhibited a relation of ρz>ρx≈ρy, 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.