Giant unconventional Hall effect in DyFeO3/LaAlO3/SrTiO3 two-dimensional electron system via proximity-induced emergent field

Abstract Two-dimensional electrons formed at the heterointerfaces of transition metal oxides have been the focus of intensive studies in condensed matter physics since their discovery at LaAlO 3 /SrTiO 3 . In particular, various attempts have been made to integrate magnetic properties with such two-dimensional electrons, aiming at exploring spintronic functions. Here we demonstrate a novel approach to realize the spin-polarized two-dimensional electron system at the LaAlO 3 /SrTiO 3 interface by the proximity effect of emergent magnetic fields from adjacent DyFeO 3 . We observed an unconventional anomalous Hall effect with a remarkable Hall angle of ~20%, resulting from the combination of high-mobility carriers in LaAlO 3 /SrTiO 3 and the emergent magnetic fields from non-coplanar canted antiferromagnetic spin textures in DyFeO 3 . These findings demonstrate a viable route toward oxide‑based spintronic functionalities by exploiting proximity‑induced emergent fields in two‑dimensional electron systems.