The magnetization in a chiral ferromagnetic fluid can be twisted and linked to form a stable three-dimensional topological soliton known as a hopfion.
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Sutcliffe, P. Let's twist again. Nature Mater 16, 392–393 (2017). https://doi.org/10.1038/nmat4883
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DOI: https://doi.org/10.1038/nmat4883
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