Modeling domain wall dynamics in thin magnetic strips with disorder

TL;DR

This paper introduces a line-based model for transverse domain walls in thin magnetic strips, analyzing how bulk disorder influences their thermally activated creep motion under magnetic fields and electric currents.

Contribution

It presents a novel line-based model that captures the stochastic thermally activated domain wall dynamics considering disorder effects in thin magnetic strips.

Findings

Creep velocity depends non-linearly on magnetic fields and electric currents.

Similar creep exponents are observed for both magnetic field and current drives.

Disorder significantly affects the deterministic control of domain wall motion.

Abstract

We present a line-based model of transverse domain walls in thin magnetic strips, to study the effect of bulk disorder on the domain wall dynamics within the thermally activated creep regime. The creep velocity is found to exhibit a non-linear dependence on both applied magnetic fields and electric currents, characterized by similar creep exponents for both forms of the external drive. We discuss briefly the significance of the inherently stochastic thermally activated domain wall motion from the point of view of spintronics applications, where it generally is essential to be able to control the domain wall displacement in a deterministic manner.