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Diffusive ferromagnetic roller gas

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An ensemble of actively rotating ferromagnetic particles is used to realize an active roller gas. Here, we investigate the diffusive properties of such a gas in experiments and simulations. We reveal that ferromagnetic rollers demonstrate a normal (Fickian) diffusion with a characteristic linear growth of the mean-squared displacement, while statistics of displacements stay non-Gaussian. At short times the system has a bimodal distribution of the displacements that transitions with time to a quasi-Gaussian distribution (Gaussian core with overpopulated tails) for a range of studied particle number densities. Inert particles introduced into the active roller gas exhibit similar diffusive behavior. The results provide insights into diffusive properties of active colloidal systems with activity originating from spinning degrees of freedom.

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The article was received on 07 Feb 2019, accepted on 29 Mar 2019 and first published on 02 Apr 2019

Article type: Paper
DOI: 10.1039/C9SM00274J
Citation: Soft Matter, 2019, Advance Article

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    Diffusive ferromagnetic roller gas

    G. Kokot, A. Vilfan, A. Glatz and A. Snezhko, Soft Matter, 2019, Advance Article , DOI: 10.1039/C9SM00274J

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