All-magnonic spin-transfer torque and domain wall propagation

TL;DR

This paper investigates how spin waves pass through magnetic domain walls without reflection and how magnons transfer spin angular momentum to drive domain wall motion, revealing efficient magnonic control of magnetic structures.

Contribution

It demonstrates that spin waves can pass through domain walls without reflection and introduces magnonic spin-transfer torque as a mechanism to control domain wall propagation.

Findings

Spin waves pass through domain walls without reflection.

Magnons transfer spin angular momentum to domain walls.

Magnonic spin-transfer torque can drive domain wall motion.

Abstract

The spin wave transportation through a transverse magnetic domain wall (DW) in a magnetic nanowire is studied. It is found that spin wave passes through a DW without reflection. A magnon, the quantum of the spin wave, carries opposite spins on the two sides of the DW. As a result, there is a spin angular momentum transfer from the propagating magnons to the DW. This magnonic spin-transfer torque can efficiently drive a DW to propagate in the opposite direction to that of the spin wave.