Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 52: Poster Magnetism III
MA 52.30: Poster
Thursday, March 12, 2026, 15:00–17:00, P4
Halbach 2.0 - Creating homogenous fields with finite size magnets — •Peter Blümler1 and Ingo Rehberg2 — 1Institute of Physics, University of Mainz, 55128 Mainz, Germany — 2Institute of Physics, University of Bayreuth, 95440 Bayreuth, Germany
Homogeneous magnetic fields can be generated with permanent magnet arrangements, most notably Halbach rings made of idealized, infinitely long magnetic rods. However, this classical concept is limited when using real, finite magnets. To address this, three-dimensional configurations have been investigated. Optimal single and stacked rings of point dipoles are identified, offering greater field strength and homogeneity than traditional Halbach designs and earlier numerical estimates.
A central innovation is the "focused configuration" (I.R. & P.B., Phys. Rev. Appl. 23 (2025) 064029), where dipoles are tilted out of the ring plane, producing highly homogeneous fields shifted away from the magnet plane. Rotating multiple tilted rings relative to each other further improves homogeneity, though at the cost of a fixed field direction (still confined to the transverse plane).
Experiments with cuboid magnets confirm the theoretical predictions, showing that these configurations overcome finite-magnet limitations and provide enhanced field strength and homogeneity. All configurations can be explored and exported for 3D printing using a dedicated Python GUI (https://zenodo.org/records/15064360).
Keywords: permanent magnets; homogeneous fields; Halbach ring; magnet construction