Changes in the relaxation spectra of a magnetic fluid in a magnetizing field
DOI:
https://doi.org/10.17072/1994-3598-2019-2-08-15Keywords:
magnetic fluid, centrifuging, magnetizing field, dynamic susceptibility, Cole-Cole diagramAbstract
The dynamic susceptibility of a magnetic fluid was measured as a function of an external constant field. In the experiments, a sample of a liquid with a high level of interparticle interactions, obtained by centrifugation, was used. The magnitude of the external magnetic field varied from 0 to 25 kA/m. Dynamic susceptibility was measured by a mutual inductance bridge in the range of probe frequencies from 4.11 Hz to 81 kHz for five different temperatures: -25, 0, 25, 50, 75°С. On the Cole-Cole diagrams, the results obtained have the form of smooth arcs intertwining in the high-frequency region. In this case, the extrapolation value of the high-frequency susceptibility does not depend on temperature. As the field grows, both the width of the Debye arc in the Kolu-Cole diagram and the high-frequency component of susceptibility decrease. But, the width of the arc decreases faster. Thus, there is a paradoxical contradiction between the dependence of the high-frequency susceptibility on the field and its constancy with temperature.References
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