Swift thermal steering of domain walls in ferromagnetic MnBi stripes

TL;DR

This paper predicts a rapid, thermally driven domain wall motion in MnBi ferromagnetic stripes, offering a potentially energy-efficient method for magnetic data manipulation.

Contribution

It introduces a novel thermal gradient-driven domain wall control mechanism in MnBi, highlighting its speed and efficiency for magnetic memory applications.

Findings

Thermal gradients induce fast domain wall motion in MnBi.

Direction of motion depends on sample thickness.

Potential for energy-efficient magnetic data processing.

Abstract

We predict a fast domain wall (DW) motion induced by a thermal gradient across a nanoscopic ferromagnetic stripe of MnBi. The driving mechanism is an exchange torque fueled by magnon accumulation at the DWs. Depending on the thickness of the sample, both hot-to-cold and cold-to-hot DW motion directions are possible. The finding unveils an energy efficient way to manipulate DWs as an essential element in magnetic information processing such as racetrack memory.