Correlation between Dzyaloshinskii Moriya interaction and spin mixing conductance at antiferromagnet / ferromagnet interface

TL;DR

This study uncovers a correlation between Dzyaloshinskii-Moriya interaction strength and spin mixing conductance at an AFM/FM interface, revealing how AFM states influence spintronic properties.

Contribution

It demonstrates a quantitative link between interfacial DMI and spin mixing conductance at IrMn/CoFeB interfaces, advancing understanding of AFM-FM interfacial coupling.

Findings

Both DMI and spin mixing conductance increase with IrMn thickness.

Correlation likely arises from AFM-states-mediated spin-flip transitions.

Findings provide insights for spintronic device design.

Abstract

The rich interaction phenomena at antiferromagnet (AFM)/ ferromagnet (FM) interfaces are key ingredients in AFM spintronics, where many underlying mechanisms remain unclear. Here we report a correlation observed between interfacial Dzyaloshinskii-Moriya interaction (DMI) Ds and effective spin mixing conductance g at IrMn/CoFeB interface. Both Ds and g are quantitatively determined with Brillouin light scattering measurements, and increase with IrMn thickness in the range of 2.5~7.5 nm. Such correlation likely originates from the AFM-states-mediated spin-flip transitions in FM, which promote both interfacial DMI and spin pumping effect. Our findings provide deeper insight into the AFM-FM interfacial coupling for future spintronic design.