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Abstract In this article, we propose the universal theoretical expression of the ferrofluid initial magnetic susceptibility, which is valid in a wide range of concentrations. The new formula is tested… Click to show full abstract
Abstract In this article, we propose the universal theoretical expression of the ferrofluid initial magnetic susceptibility, which is valid in a wide range of concentrations. The new formula is tested against experimental susceptibility measurements and compared with the well-known second-order modified mean-field theory (MMF2) [Phys. Rev. E 64, 041405 (2001)] and the extended version of MMF2 theory (MMF2+) [Phys. Rev. E 96, 052609 (2017)]. It is shown that the new formula is more reliable than MMF2 and MMF2 + theories and predicts initial magnetic susceptibility correctly for the polydisperse ferrofluids within a wide range of both temperature and concentration.
Journal Title: Journal of Magnetism and Magnetic Materials
Year Published: 2020
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