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The complex oxide heterostructures such as LaAlO3/SrTiO3 (LAO/STO) interfaceare paradigmatic platforms to explore emerging multi-degrees of freedomcoupling and the associated exotic phenomena. In this study, we reveal theeffects of multiorbital and magnetic ordering on Rashba spin-orbit coupling(SOC) at the LAO/STO (001) interface. Based on first-principles calculations,we show that the Rashba spin splitting near the conduction band edge can betuned substantially by the interfacial insulator-metal transition due to themultiorbital effect of the lowest t_2g bands. We further unravel a competitionbetween Rashba SOC and intrinsic magnetism, in which the Rashba SOC inducedspin polarization is suppressed by the interfacial magnetic ordering. Theseresults deepen our understanding of intricate electronic and magneticreconstruction at the perovskite oxide interfaces and shed light on theengineering of oxide heterostructures for all-oxides-based spintronic devices.

Tunable Rashba spin-orbit coupling and its interplay with multiorbital effect and magnetic ordering at oxide interfaces