Shot noise of a ferromagnetic nanowire with a domain wall

TL;DR

This paper investigates how a ballistic domain wall in a ferromagnetic nanowire affects the shot noise of spin-polarized currents, revealing that the domain wall can significantly alter noise levels depending on its properties.

Contribution

It provides new insights into the impact of domain walls on shot noise in ferromagnetic nanowires, highlighting the dependence on domain wall length and conductance.

Findings

Shot noise is strongly influenced by the presence of a domain wall.

The domain wall can either reduce or enhance shot noise.

The effect depends on the domain wall length and conductance.

Abstract

We study shot noise of the spin-polarized current in a diffusive ferromagnetic nanowire which contains a ballistic domain wall. We find that the existence of a short domain wall influences strongly the shot noise for sufficiently high spin-polarization of the wire. Compared to the situation of the absence of the domain wall, the shot noise can be reduced or enhanced depending on the length of the domain wall and its relative conductance.