Robust spin-transfer torque and magnetoresistance in non-collinear antiferromagnetic junctions

TL;DR

This paper theoretically investigates non-collinear antiferromagnetic junctions, revealing large, robust magnetoresistance and spin-transfer torque effects that enable ultrafast switching, highlighting advantages over ferromagnetic devices.

Contribution

It introduces the concept of non-collinear antiferromagnetic junctions with unique spin-transfer torque and magnetoresistance properties, advancing spintronics technology.

Findings

Large and robust magnetoresistance observed

Ultrafast switching between magnetic states demonstrated

Distinct spin-transfer torque behavior compared to ferromagnets

Abstract

Ferromagnetic spin-valves and tunneling junctions are crucial for spintronics applications and are one of the most fundamental spintronics devices. Motivated by the potential unique advantages of antiferromagnets for spintronics, we theoretically study here junctions built out of non-collinear antiferromagnets. We demonstrate a large and robust magnetoresistance and spin-transfer torque capable of ultrafast switching between parallel and anti-parallel states of the junction. In addition, we show that the non-collinear order results in a spin-transfer torque that is in several key aspects different from the spin-transfer torque in ferromagnetic junctions.