Resistivity noise in crystalline magnetic nanowires and its implications to domain formation and kinetics

TL;DR

This study examines resistance noise in crystalline magnetic nanowires, revealing temperature and magnetic field effects, domain wall depinning behavior, and diffusion crossover, which are crucial for their application in magnetoelectronic devices.

Contribution

It provides new insights into the temperature and magnetic field dependence of resistance noise and the underlying domain wall dynamics in crystalline magnetic nanowires.

Findings

Resistance noise increases exponentially with temperature and magnetic field.

Frequency dependence indicates a crossover from nondiffusive to diffusive kinetics.

Strong collective depinning effects are observed in the noise behavior.

Abstract

We have investigated the time-dependent fluctuations in electrical resistance, or noise, in high quality crystalline magnetic nanowires within nanoporous templates. The noise increases exponentially with increasing temperature and magnetic field, and has been analyzed in terms of domain wall depinning within the Neel-Brown framework. The frequency-dependence of noise also indicates a crossover from nondiffusive kinetics to long-range diffusion at higher temperatures, as well as a strong collective depinning, which need to be considered when implementing these nanowires in magnetoelectronic devices.