A novel design to realize deterministic switching of perpendicularly magnetic layers by spin orbital torque through antiferromagnetic coupling

TL;DR

This paper introduces a new multilayer structure enabling predictable, deterministic switching of perpendicular magnetic layers via spin orbital torque, without external magnetic fields, using antiferromagnetic coupling confirmed through micromagnetic simulations.

Contribution

A novel multilayer design utilizing antiferromagnetic coupling to achieve deterministic switching of perpendicular magnetic layers driven by spin Hall effect, eliminating the need for external magnetic fields.

Findings

Deterministic switching confirmed through simulations

Reversal state predictable above 60 MA/cm² current density

Antiferromagnetic coupling is easily tunable

Abstract

We proposed a novel and simple multilayer structure to realize the deterministic switching of perpendicularly magnetized layers (Co in our work) by spin orbital torque from the spin Hall Effect in this paper. A pinned layer is introduced, antiferromagnetically coupled to the magnetic Co layer. We have confirmed the deterministic switching of perpendicularly magnetized layers from perspectives of switching loops, trajectories and switching properties under periodic spin currents through micromagnetic simulation. The antiferromagnetic interaction accounts for the deterministic switching exhibited in the structure and the reversal ultimate state of the magnetic layer is predictable when the applied spin current density is above 60MA/cm2. In our design, the antiferromagnetic coupling is easily tunable and no external magnetic field is needed.