Interfacial Control of Dzyaloshinskii Moriya Interaction in Heavy Metal_Ferromagnetic Metal Thin Film Heterostructures

TL;DR

This study demonstrates how inserting a thin platinum layer can significantly tune the interfacial Dzyaloshinskii Moriya Interaction in magnetic heterostructures, enabling precise control of spin textures for advanced magnetic device applications.

Contribution

It reveals a method to continuously tune the DMI constant in magnetic heterostructures via platinum wedge insertion, providing new design strategies for spintronic devices.

Findings

DMI constant D can be tuned by over three times.

Less than one monolayer of Pt insertion achieves this tuning.

Insights for designing magnetic structures with tailored DMI.

Abstract

The interfacial Dzyaloshinskii Moriya Interaction (DMI) in ultrathin magnetic thin film heterostructures provides a new approach for controlling spin textures on mesoscopic length scales. Here we investigate the dependence of the interfacial DMI constant D on a Pt wedge insertion layer in Ta_CoFeB_Pt(wedge)_MgO thin films by observing the asymmetric spin wave dispersion using Brillouin light scattering. Continuous tuning of D by more than a factor of three is realized by inserting less than one monolayer of Pt. The observations provide new insights for designing magnetic thin film heterostructures with tailored D for controlling skyrmions and magnetic domain wall chirality and dynamics.