Large intrinsic anomalous Hall effect in SrIrO3 induced by magnetic proximity effect
Myoung-Woo Yoo, J. Tornos, Anke Sander, Ling-Fang Lin, Narayan Mohanta, Andrea Peralta, D. Sánchez-Manzano, Fernando Gallego, D. Haskel, J. W. Freeland, D. J. Keavney, Yongseong Choi, J. Strempfer, Xiao Wang, Mariona Cabero, Hari Babu Vasili, Manuel Valvidares, Gabriel Sánchez‐Santolino, J. M. Gonzalez-Calbet, A. Rivera, C. León, Stephan Rosenkranz, Manuel Bibès, A. Barthélémy, A. Anane, Elbio Dagotto, Satoshi Okamoto, S. G. E. te Velthuis, J. Santamarı́a, Javier E. Villegas
Abstract
Abstract The anomalous Hall effect (AHE) is an intriguing transport phenomenon occurring typically in ferromagnets as a consequence of broken time reversal symmetry and spin-orbit interaction. It can be caused by two microscopically distinct mechanisms, namely, by skew or side-jump scattering due to chiral features of the disorder scattering, or by an intrinsic contribution directly linked to the topological properties of the Bloch states. Here we show that the AHE can be artificially engineered in materials in which it is originally absent by combining the effects of symmetry breaking, spin orbit interaction and proximity-induced magnetism. In particular, we find a strikingly large AHE that emerges at the interface between a ferromagnetic manganite (La 0.7 Sr 0.3 MnO 3 ) and a semimetallic iridate (SrIrO 3 ). It is intrinsic and originates in the proximity-induced magnetism present in the narrow bands of strong spin-orbit coupling material SrIrO 3 , which yields values of anomalous Hall conductivity and Hall angle as high as those observed in bulk transition-metal ferromagnets. These results demonstrate the interplay between correlated electron physics and topological phenomena at interfaces between 3 d ferromagnets and strong spin-orbit coupling 5 d oxides and trace an exciting path towards future topological spintronics at oxide interfaces.