Tunable and enhanced Rashba spin-orbit coupling in iridate-manganite heterostructures
T. S. Suraj, Ganesh Ji Omar, Hariom Jani, M.M. Juvaid, Sonu Hooda, A. Chaudhuri, Andrivo Rusydi, K. Sethupathi, T. Venkatesan, Ariando Ariando, M. S. Ramachandra Rao
Abstract
Tailoring spin-orbit interactions and Coulomb repulsion are the key features to observe exotic physical phenomena such as magnetic anisotropy and topological spin texture at oxide interfaces. Our study proposes a platform for engineering magnetism and spin-orbit coupling at the ${\mathrm{LaMnO}}_{3}/{\mathrm{SrIrO}}_{3}$ $(3d\text{\ensuremath{-}}5d)$ oxide interface by tuning the ${\mathrm{LaMnO}}_{3}$ growth conditions, which controls the lattice displacement and spin-correlated interfacial coupling through charge transfer. We report a tunable and enhanced interface-induced Rashba spin-orbit coupling where the spin relaxation mechanism varies with magnetic behavior of the underlying ${\mathrm{LaMnO}}_{3}$ layer. The x-ray spectroscopy measurements reveal the quantitative valence states of Mn and their impact on charge transfer. Our angle-dependent magnetoresistance measurements also reflects the signature of magnetic proximity effect in ${\mathrm{SrIrO}}_{3}$ and can be tuned with the magnetic nature of ${\mathrm{LaMnO}}_{3}$ in a ${\mathrm{LaMnO}}_{3}/{\mathrm{SrIrO}}_{3}$ bilayer. Our work demonstrates a route to engineer the interface-induced Rashba spin-orbit coupling and magnetic proximity effect at the $3d\text{\ensuremath{-}}5d$ oxide interface for spintronics applications.