Tunable diffusion of magnetic particles in a quasi-one-dimensional channel

TL;DR

This study investigates how the diffusion behavior of ferromagnetic particles in a narrow channel can be controlled using an external magnetic field, revealing tunable mobility and diffusion regimes through simulations.

Contribution

It introduces a method to tune the diffusion dynamics of magnetic particles in a confined channel by adjusting the external magnetic field orientation.

Findings

Diffusion mobility is adjustable with magnetic field orientation.

Diffusion exponent in subdiffusive regime is independent of field orientation at weak fields.

Crossover times between diffusion regimes can be controlled by the magnetic field.

Abstract

The diffusion of a system of ferromagnetic dipoles confined in a quasi-one-dimensional parabolic trap is studied using Brownian dynamics simulations. We show that the dynamics of the system is tunable by an in-plane external homogeneous magnetic field. For a strong applied magnetic field, we find that the mobility of the system, the exponent of diffusion and the crossover time among different diffusion regimes can be tuned by the orientation of the magnetic field. For weak magnetic fields, the exponent of diffusion in the subdiffusive regime is independent of the orientation of the external field.