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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Magnetization results for the ferrofluids: (a,c) temperature dependence after zero-field cooling (ZFC) (full symbols) and after cooling under the measuring field of 2 mT (FC) (open symbols); (b,d) isothermal magnetization curves at 250 K.