Example of multipoles in science: spin configuration of AFM materials

[bolandthomas]

The spin configuration of antiferromagnetic materials is hard to identify because the net magnetization in these materials is zero. However, using experimental techniques (such as inducing the planar Hall effect), one can detect so-called cluster magnetic multipoles, from which one can derive the spin configuration.
source: Song, J., Oh, T., Ko, E.K. et al. Higher harmonics in planar Hall effect induced by cluster magnetic multipoles. Nat Commun 13, 6501 (2022). https://doi.org/10.1038/s41467-022-34189-6

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