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Related Experiment Video

Updated: Jul 14, 2026

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T

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Published on: January 16, 2021

PCB Coil Pairs for Small Magnetic Volumes.

Howard R Selden¹, Rebecca Y Lai², Ryan A Riskowski¹

¹Department of Physics, University of Nebraska at Omaha, 6001 Dodge Street, Omaha, NE 68182, USA.

Nanomaterials (Basel, Switzerland)

|July 13, 2026

Summary

A compact radiofrequency magnetic field generator using printed circuit board coils offers reduced size and power for localized applications. This device is suitable for magnetic nanoparticle heating and actuation, demonstrating consistent operating parameters.

Keywords:

iron oxide nanoparticles magnetic heating magnetic nanoparticles radiofrequency heating

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Area of Science:

Electrical Engineering
Biomedical Engineering
Materials Science

Background:

Localized radiofrequency (RF) magnetic fields are crucial for applications like magnetic nanoparticle heating and actuation.
Conventional solenoidal systems often present limitations in terms of size, sample volume, and power consumption.

Purpose of the Study:

To describe a novel, compact RF magnetic field generator.
To enable field generation within millimeter-scale volumes.
To assess its suitability for applications requiring localized magnetic fields.

Main Methods:

Design and fabrication of a compact RF magnetic field generator using stacked, paired parallel printed multilayer circuit board (PCB) coils.
Characterization of RF response, including impedance and scattering parameters.
Electromagnetic modeling and experimental measurement of magnetic field amplitude and spatial homogeneity.

Main Results:

The PCB-based coil configuration significantly reduces device size, sample volume, and power requirements compared to solenoidal systems.
The system operates effectively near ~330 kHz, a frequency relevant for magnetic nanoparticle heating.
Electromagnetic modeling showed a maximum local deviation from the mean field of 5.5%.
Experimental measurements confirmed a mean B_z field of 6.3 ± 0.1 mT/A between paired PCBs.

Conclusions:

The developed compact RF magnetic field generator is a viable alternative to conventional systems for localized field generation.
The device's performance characteristics are consistent with the requirements for magnetic nanoparticle heating applications.
This PCB-based coil design offers a scalable and efficient solution for micro-scale magnetic field applications.