Spherical sample holders to improve the susceptibility measurement of superparamagnetic materials

TL;DR

This paper introduces spherical sample holders designed for vibrating sample magnetometers, enabling accurate susceptibility measurements of superparamagnetic materials, including liquids and powders, by ensuring homogeneous magnetic fields and magnetization.

Contribution

The paper presents a novel design of spherical cavity sample holders that improve the homogeneity of magnetic measurements in VSM systems, allowing better characterization of superparamagnetic materials.

Findings

Homogeneous magnetization and internal magnetic field achieved.

Accurate susceptibility measurements for liquids and powders.

Enhanced measurement reliability in VSM systems.

Abstract

The design of two custom sample holders with a spherical cavity for commercial vibrating sample magnetometer systems is described. For such cavities the magnetization M and the internal magnetic field Hi of a sample are both homogeneous. Consequently, the material parameter M(Hi) of a sample can be determined even for liquids and powders with a high magnetic susceptibility.