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The Langevin formula for describing the magnetization curve of a magnetic liquid

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Abstract

It has been shown that, at the initial stage of the magnetization curve, the magnetic susceptibility of magnetic liquid determined as χ = Mμ0/B (M is the magnetization, B is the magnetic induction in a sample) obeys the Curie law, and the magnetic susceptibility determined as χ = M/H (H is the magnetic field intensity in a sample) obeys the Curie–Weiss law. Since the Curie law is a particular case of the Langevin dependence, it is assumed that an experimental magnetization curve is described by the Langevin formula with a Langevin parameter ξ = PB/kT, where P is the magnetic moment of a particle and T is the temperature. Experimental verification has shown that, at parameter ξ, the mean relative deviation between the values of M measured and calculated by the Langevin formula is 5%. This deviation can be accounted for by the influence of dispersion of the magnetic moments of nanoparticles.

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Authors and Affiliations

  1. St. Petersburg State Institute of Technology (Technical University), St. Petersburg, 198013, Russia

    S. V. D’yachenko & A. I. Zhernovoi

Authors
  1. S. V. D’yachenko
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  2. A. I. Zhernovoi
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Correspondence to S. V. D’yachenko.

Additional information

Original Russian Text © S.V. D’yachenko, A.I. Zhernovoi, 2016, published in Zhurnal Tekhnicheskoi Fiziki, 2016, Vol. 86, No. 12, pp. 78–80.

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D’yachenko, S.V., Zhernovoi, A.I. The Langevin formula for describing the magnetization curve of a magnetic liquid. Tech. Phys. 61, 1835–1837 (2016). https://doi.org/10.1134/S1063784216120112

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  • DOI: https://doi.org/10.1134/S1063784216120112

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