Revolutionary 3D magnet setup could slash MRI costs and boost access

German physicists from the University of Bayreuth and Johannes Gutenberg University Mainz have developed a novel magnetic field design that surpasses the traditional Halbach array by delivering stronger, cheaper, and more uniform magnetic fields in a compact setup. Their innovation involves arranging 16 tiny neodymium (FeNdB) magnet cuboids in optimized three-dimensional orientations on 3D-printed supports, forming single or stacked double rings. This focused design maintains magnetic field strength and uniformity not only within the magnet plane but also above it, addressing a key limitation of the Halbach array, which struggles to produce uniform fields in finite-sized, practical applications. This breakthrough holds significant promise for technologies requiring stable, homogeneous magnetic fields, particularly medical imaging. Conventional MRI machines rely on costly, complex superconducting magnets that require cryogenic cooling, limiting access in rural and underserved regions. The new permanent magnet configuration offers a low-cost, energy-efficient alternative that could make MRI technology more accessible in remote clinics, mobile health units, and