High Frequency Domain Wall Oscillations in Ferromagnetic Nanowire with a Nanoscale Dzyaloshinskii Moriya Interaction (DMI) Region

TL;DR

This paper investigates how a localized Dzyaloshinskii Moriya Interaction (DMI) region in a ferromagnetic nanowire induces tunable high-frequency domain wall oscillations, with potential applications in neuromorphic computing.

Contribution

It demonstrates for the first time that a nanoscale DMI region can cause and control high-frequency domain wall oscillations in a nanowire.

Findings

Oscillation frequency is tunable within a few GHz.

Local DMI modulation causes domain wall oscillations.

Potential application in neuromorphic computing.

Abstract

The Dzyaloshinskii Moriya Interaction (DMI) has laid the foundation for many novel chiral structures such as Skyrmions. In most of the studies so far, the DMI is present in the whole of the magnetic layer. Here, we report our investigations on a ferromagnetic nanowire where DMI is confined to a nanoscale region. We observe that the local modulation of magnetic properties causes oscillation of domain walls under the influence of spin-transfer torque. The oscillation frequency is tunable within a few GHz, making this observation potentially useful for applications in neuromorphic computing.