Abstract
A fulfillment of Curie’s law in magnetic fluids provides an option of their thermometric applications to measure thermodynamic temperature. On the other hand, it was shown elsewhere that the initial magnetic susceptibility χ of magnetic fluids follows Curie–Weiss’s law rather than Curie’s law. To obtain its values, use was made of the formula χ = М/Н0, where М is magnetization, and Н0 is the external magnetic field strength without any specimen. This work deals with investigations of the dependence of magnetic susceptibility of magnetic fluid on temperature for the cases where its values are found via the following formulas: 1) χ = М/Н0, and 2) χ = Мμ0/В, where В is the magnetic field induction inside the specimen. It is found that in the first case the temperature dependence of χ obeys Curie–Weiss’s law while in the second case – Curie’s law. The reason for this results from the fact that induction В acting on the particles of magnetic fluid is noticeably higher than that of the external field, В0.
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