based ferromagnetic nanofluid
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Abstract
We report some unusual magnetic properties observed in based ferrofluid (with an average particle size of
). More precisely, in addition to the low-field ferromagnetic (FM) phase transition with an intrinsic Curie temperature
K, a second phase transition with an extrinsic Curie temperature
K emerges at higher (saturating) magnetic field. The transitions meet at the crossover point
K. The origin of the second transition is attributed to magnetic field induced proximity type interaction between FM particles through non-FM layers.
Acknowledgements
The authors thank Dr L. Fetisov for realization of magnetic measurements.
Notes
No potential conflict of interest was reported by the authors.
Additional information
Funding
The financial support through the grants of the Romanian Governmental Representative in the Joint Institute for Nuclear Research (JINR) and the UPB -JINR Cooperation Programme of scientific projects for the period 2016–2017 is acknowledged. This work was partially supported by Brazilian agencies CNPq , CAPES and FAPESQ [DCR-PB].