Halbach magnets are a source of homogeneous magnetic field in an enclosed volume while keeping stray fields at a minimum. Here, we present the design, construction, and characterization for a 10 cm inner diameter double Halbach ring providing a homogeneous (<100 ppm over 1 x 1 x 0.5 cm3) magnetic field of around 105 mT, which will be used for a diamond based microwave-free widefield imaging setup. The final characterization is performed with a novel fiberized diamond-based sensor on a 3D translation stage documenting the high homogeneity of the constructed Halbach array and its suitability for the proposed use.
@article{arxiv.2008.07339,
title = {High homogeneity permanent magnet for diamond magnetometry},
author = {Arne Wickenbrock and Huijie Zheng and Georgios Chatzidrosos and Joseph Shaji Rebeirro and Tim Schneemann and Peter Bluemler},
journal= {arXiv preprint arXiv:2008.07339},
year = {2021}
}