Domain wall displacement triggered by an AC current below threshold

TL;DR

This paper theoretically shows that an AC current below the threshold can induce significant domain wall displacement by exploiting resonance effects near the pinning frequency, supported by recent experimental evidence.

Contribution

It introduces a theoretical model demonstrating how low-amplitude AC currents can cause domain wall motion through resonance, expanding understanding of domain wall dynamics under sub-threshold stimuli.

Findings

Resonance significantly enhances domain wall displacement at low currents.

Displacement of order micrometers is achievable below threshold current.

Experimental results support the resonance-driven displacement mechanism.

Abstract

It is theoretically demonstrated that a displacement of a pinned domain wall, typically of order of $\mu$m, can be driven by use of an ac current which is below threshold value. The point here is that finite motion around the pinning center by a low current is enhanced significantly by the resonance if the frequency is tuned close to the pinning frequency as demonstrated by recent experiment.