Spin dynamics in MgO based magnetic tunnel junctions with dynamical exchange coupling

TL;DR

This paper investigates spin dynamics in Fe|MgO|Fe tunnel junctions, revealing how spin pumping influences magnetic states and can modulate magnetization similarly to thermal or electric biases.

Contribution

It introduces a detailed analysis of spin pumping effects on spin dynamics in MgO-based magnetic tunnel junctions using coupled Landau-Lifshitz-Gilbert equations.

Findings

Spin pumping stabilizes a quasi-antiparallel state.

Spin pumping torque can effectively modulate magnetization.

The effects are comparable to thermal and electric bias-driven spin torques.

Abstract

We study the spin dynamics in Fe|MgO|Fe tunnel junction with the dynamical exchange coupling by coupled Landau-Lifshitz-Gilbert equations. The effects of spin pumping on the spin dynamics are investigated in detail. It is observed that the spin pumping can stabilize a quasi-antiparallel state rather than a quasi-parallel one. More interestingly, our work suggests that the spin pumping torque can efficiently modulate the magnetization, similar to the thermal-bias-driven and electricbias-driven spin torques.