Spin orbit torque driven strong spin to charge conversion in all oxide interface*

The behavior of spin orbit coupling (SOC) including special phenomenon (such as those showing the Rashba-Edelstein effect, Spin Galvanic effect, and others), which can only appear in low-dimensional materials and low-dimensional systems, interplays crucial role in between spin and charge currents. Also, effective spin orbit torque (SOT) can modulate magnetization in various ferromagnetic/non-magnetic bilayers. In this study, we studied spin orbit torque strength by measuring ferromagnetic resonance (FMR), and studied field induced magnetization switching as well. at all oxide structure of La_1-xCa_xMnO₃ (LCMO)/SrTiO₃ (STO) bilayer. Quasi 2-dimensional conducting surface of STO was prepared by Ar plasma treatment. After then, the magnetic oxide LCMO thin film was deposited by using Pulsed Laser Deposition (PLD) method. Further, possible origins of the spin orbit torque generated at the conducting interface between LCMO and STO will be discussed later. Such study on low-dimensional materials with comparable energy scales among kinetic energy, spin-orbit interaction, and magnetic field, which opens a new route to enhance nonreciprocal response and its functionalities in the emerging spin-orbitronics.