Shape-dependent Depinning of a Domain Wall by a Magnetic Field and a Spin-Polarized Current

TL;DR

This paper investigates how the shape of a magnetic sample influences the depinning of domain walls driven by magnetic fields and spin-polarized currents, combining theoretical predictions with experimental validation.

Contribution

It introduces a theoretical model for shape-dependent geometric pinning of domain walls and confirms its accuracy through experimental measurements.

Findings

Shape significantly affects domain wall depinning thresholds.

Theoretical predictions match experimental data.

Geometry modulation can control domain wall motion.

Abstract

The effect of sample shape on the depinning of the domain wall (DW) driven by an applied magnetic field or a spin-polarized current is studied theoretically. The shape effect resulting from the modulation of the sample width (geometric pinning) can essentially affect the DW depinning. We found a good agreement between the ratios of the critical values of the magnetic field and the spin-polarized current predicted by the theory and measured in the experiment.