# Graphical Magnetogranulometry of EMG909

## TL;DR

This paper presents a graphical method to analyze the magnetization curve of EMG909 ferrofluid, enabling the determination of magnetic particle distribution characteristics without prior assumptions.

## Contribution

It introduces a novel graphical rectification technique based on the inverse Langevin function for analyzing ferrofluid magnetization data.

## Key findings

- Effective dipole strength of magnetic particles determined
- Distribution function means estimated
- Method does not require initial distribution assumptions

## Abstract

The magnetization curve of the ferrofluid EMG909 is measured. It can adequately be described by a superposition of four Langevin terms. The effective dipole strength of the magnetic particles in this fluid is subsequently obtained by a graphical rectification of the magnetization curve based on the inverse Langevin function. The method yields the arithmetic and the harmonic mean of the magnetic moment distribution function, and a guess for the geometric mean and the relative standard deviation. It has the advantage that it does not require a prejudiced guess of the distribution function of the poly-disperse suspension of magnetic particles.