On the Form of the Functional Dependence of the Magnetic Susceptibility of a Magnetic Liquid on the Temperature

Dikanskii, Yu. I.; Ispiryan, A. G.; Kunikin, S. A.

doi:10.1007/s11182-017-1058-y

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2018

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“…Dependence on Fig. 5 illustrates that while volume concentration of magnetic particles decrease effective field parameter  increase (similar dependence for other samples of ferrofluid were expressed in [9]). This means that intensity of particle interaction increase We assumed that this is due to a violation of the homogeneity of the sample due to the formation of aggregates when the initial sample is diluted by the carrier.…”

Section: Resultssupporting

confidence: 73%

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On the temperature dependence of ferrofluid susceptibility

2018

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The fulfillment of Curie– Weiss laws for a ferrofluid is critically discussed. The results of investigations of the magnetic susceptibility temperature dependences of ferrofluid and dried powder of magnetic particles are presented. The effective field parameter is computed in approximation of the effective field theory. It is indicated that the value of the effective field parameter is not constant and depends on the concentration of magnetic nanoparticles and the temperature of the sample. It was found that Curie-Weiss law with λ = 4π / 3 is satisfied for ferrofluid with a limited range of volume concentration of magnetic particles.

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Section: Resultssupporting

confidence: 73%

“…2). Observation of the transition of the ensemble of magnetic particles to a superparamagnetic state is possible if the relaxation time of the ensemble correspond to the observation time (period of probing field) [9]. The relaxation time of the activation magnetization reversal is [10]: From the Eq.…”

Section: Resultsmentioning

confidence: 99%