Effective fields in magnetic colloids and features of their magnetization kinetics Yuri I. Dikansky, Anna G. Ispiryan, Igor M. Arefyev and Stanislav A. Kunikin Eur. Phys. J. E, 44 1 (2021) 2 Published online: 10 February 2021 DOI: 10.1140/epje/s10189-021-00015-y