From Magnetic Pumps and Gears to Halbach Spheres: Applying permanent magnets

A DCAMM seminar will be presented by

Abstract:

Using magnetic spheres [1] together with an open-source graphical user interface [2], this talk illustrates basic features of magnetic interaction leading to three applications based on magnetic particles:

1. Two dipoles realize two different cogging-free magnetic gears [3].
2. No moving parts are needed to pump magnetic fluids [4].
3. Icosahedral ordering of magnets is best for achieving homogenous fields [5].
   
   

[1] S. Hartung et al., Physical Review B 98, 214424 (2018).
[2] I. Rehberg & P. Blümler. Halbach_two_point_oh: Optimize Uniform Fields with Clusters and Rings of   Permanent Magnets. Zenodo  https://doi.org/10.5281/zenodo.17185412 (2025).
[3] S. Hartung, I. Rehberg, Arch Appl Mech 91, 1423 (2021).
[4] R. Krauß et al.,   Pumping fluid by magnetic surface stress, New Journal of Physics 8, 18 (2006)
[5] I. Rehberg and Peter Blümler, Discretized Halbach spheres: Icosahedral symmetry for optimal field homogeneity, Phys. Rev. Appl. (2026).

Cake, coffee and tea will be served 15 minutes before the seminar starts.

All interested persons are invited