Perovskite oxide heterojunction for Rashba-Dresselhaus assisted antiferromagnetic spintronics

TL;DR

This paper proposes a perovskite oxide heterostructure that exhibits strong Rashba-Dresselhaus effects and noncollinear antiferromagnetism, offering a promising platform for antiferromagnetic spintronics with potential for spin-orbit torque applications.

Contribution

It introduces a novel heterostructure design of SrIrO3 sandwiched between LaAlO3 and SrTiO3, demonstrating strong spin-orbit effects and antiferromagnetic properties through first-principles calculations.

Findings

Two-dimensional conducting interface with Rashba-Dresselhaus effect

Presence of noncollinear antiferromagnetism

Proximity-induced Rashba-like effect in Ti 3d bands

Abstract

A major impediment towards realizing technologies based on the emerging principles of antiferromagnetic spintronics is the shortage of suitable materials. In this paper, we propose a design of polar|nonpolar heterostructures of perovskite oxides, where a single unit cell of SrIrO3 is sandwiched between a thin film of LaAlO3 and a substrate of SrTiO3. Our calculations within the framework of density-functional theory + Hubbard U + spin-orbit coupling reveal a two-dimensional conducting layer with electron and hole pockets at the interface, exhibiting a strong anisotropic Rashba-Dresselhaus effect along with noncollinear antiferromagnetism, indicating the possibility of realizing a spin-orbit torque. An insightful physical model for the anisotropic Rashba-Dresselhaus effect nicely interprets our results, providing an estimate for the Rashba-Dresselhaus coefficients and illustrating pseudospin orientation.We also observe a proximity-induced prominent Rashba-like effect for Ti 3d empty bands. Our results suggest that the heterostructure may possess the essential ingredients for antiferromagnetic spintronics, deserving experimental verification.