In this work we present a novel, compact, power efficient magnetic field source design for magnetic field imaging microscopy. The device is based on a pair of diametrically magnetized permanent magnet cylinders with electro-mechanical rotation control and ferrite field concentrators. A Hall probe and NV centers in diamond are used to demonstrate a proof of concept of a proposed magnetic field setup and to characterise the homogeneity of the produced magnetic field on a micrometer scale. Numerical simulation results are compared with experimental results showing good agreement of the distribution of the magnetic field in the setup. As a result, a magnetic field source with a tunable field amplitude in the range from 1 mT to 222 mT is demonstrated, achieving a magnetic field homogeneity of 2 ppm/μm or 0.5 μT/μm at 222 mT in a 25×25 μm field of view.
@article{arxiv.2112.15359,
title = {Tunable magnetic field source for magnetic field imaging microscopy},
author = {Andris Berzins and Hugo Grube and Reinis Lazda and Marc A. Hannig and Janis Smits and Ilja Fescenko},
journal= {arXiv preprint arXiv:2112.15359},
year = {2023}
}