Rapid Domain Wall Motion in Permalloy Nanowires Excited by Spin-Polarized Current Applied Perpendicular to the Nanowire

TL;DR

This paper demonstrates rapid domain wall motion in permalloy nanowires driven by perpendicular spin-polarized currents, achieving high velocities at relatively low current densities, advancing spintronic device control.

Contribution

It introduces a novel method of exciting domain walls using perpendicular spin currents, showing high velocities at low current densities.

Findings

Domain walls reach velocities up to 800 m/s.

High efficiency of current-induced domain wall motion.

Potential for low-power spintronic applications.

Abstract

We study domain wall (DW) dynamics in permalloy nanowires excited by alternating spin-polarized current applied perpendicular to the nanowire. Spin torque ferromagnetic resonance measurements reveal that DW oscillations at a pinning site in the nanowire can be excited with velocities as high as 800 m/s at current densities below 10$^7$ A/cm$^2$.