An air-cooled Litz wire coil for measuring the high frequency hysteresis loops of magnetic samples : a useful setup for magnetic hyperthermia applications

TL;DR

This paper presents a cost-effective, air-cooled Litz wire coil setup for high-frequency hysteresis loop measurements of magnetic samples, suitable for magnetic hyperthermia research, demonstrating reproducible results in 6-56 kHz range.

Contribution

The paper introduces a simple, water-free, air-cooled coil system for high-frequency hysteresis measurements, enhancing magnetic characterization for hyperthermia applications.

Findings

Reproducible hysteresis measurements in 6-56 kHz range.

Comparison shows results are consistent with other measurement methods.

Setup effectively characterizes colloidal magnetic nanoparticle solutions.

Abstract

A low-cost and simple setup for measuring the high-frequency hysteresis loops of magnetic samples is described. An AMF in the range 6-100 kHz with amplitude up to 80 mT is produced by a Litz wire coil. The latter is air-cooled using a forced-air approach so no water flow is required to run the setup. High-frequency hysteresis loops are measured using a system of pick-up coils and numerical integration of signals. Reproducible measurements are obtained in the frequency range of 6-56 kHz. Measurement examples on ferrite cylinders and on iron oxide nanoparticle ferrofluids are shown. Comparison with other measurement methods of the hysteresis loop area (complex susceptibility, quasi-static hysteresis loops and calorific measurements) is provided and shows the coherency of the results obtained with this setup. This setup is well adapted to the magnetic characterization of colloidal solutions of MNPs for magnetic hyperthermia applications.