Impact of magnetic domains on magnetic flux concentrators

TL;DR

This paper investigates how magnetic domains influence magnetic flux concentrators using simulations validated against experiments and benchmarks, highlighting the significance of micromagnetic effects at small scales.

Contribution

It introduces a comprehensive simulation approach to study magnetic domains in flux concentrators, validated with experimental and benchmark data, emphasizing micromagnetic effects at small gaps.

Findings

Magnetic domains significantly affect flux concentrator performance.

Simulation results align with experimental and benchmark data.

Micromagnetic effects become dominant at small sensor gaps.

Abstract

The impact of magnetic domains in magnetic flux concentrators is studied using the simulation software MuMax3. First, the simulation parameters are validated using experimental results from magnetic force microscopy; second the simulation output is benchmarked with the one obtained using Comsol Multiphysics. Finally, the impact of magnetic domain is assessed, showing how micromagnetic effects can become relevant, if not dominant, when scaling the gap between the MFC and the sensor.