Evidence for field induced proximity type behavior in ferromagnetic nanofluid
Abstract
We report some unusual magnetic properties observed in CoFe2O4 based ferrofluid (with an average particle size of D = 6 nm). More precisely, in addition to the low-field ferromagnetic (FM) phase transition with an intrinsic Curie temperature TCb=350K, a second phase transition with an extrinsic Curie temperature TCw = 266K emerges at higher (saturating) magnetic field. The transitions meet at the crossover point Tcr = 210 K. The origin of the second transition is attributed to magnetic field induced proximity type interaction between FM particles through non-FM layers.
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