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Coupling of blocking and melting in cobalt ferrofluids
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View: Figures


Image of FIG. 1.
FIG. 1.

ZFC and FC curves for cobalt MNP (a) powders, and in o-xylene (b), chloroform (c), and toluene (d). for all measurements. FCC and FCW are the field cooling curves during decreasing and increasing temperatures, respectively. The scale bar of the inset in (a) is 40 nm.

Image of FIG. 2.
FIG. 2.

ZFC/FC curve for well separated melting and blocking temperatures (a), very small peak (marked by arrow) observed during melting, and the inset shows the magnified peak of the ZFC curve in the vicinity of of o-xylene; (b) the simulated ZFC M spectrum of 5 nm cobalt MNPs with a log normal size distribution and a standard deviation of 1 nm approximated at 50 K, 124 K and 200 K, respectively (Ref. 8), for particles; and (c) the schematic M spectrum of ZFC and FC (solid lines) and the corresponding enhanced M spectrum of ZFC and FC (dashed lines) by adding the effect of Brownian relaxation that aligns easy axis of Co MNPs to the external magnetic field.

Image of FIG. 3.
FIG. 3.

(a) The jump of the M(H,T) curve during the melting of the solvent, indicates a first order melting induced magnetic phase transformation. The measurement is performed from low temperature to high temperature. (b) Thermal hysteresis loop of Co MNPs in o-xylene with an external magnetic field of 500 Oe.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Coupling of blocking and melting in cobalt ferrofluids