Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 508, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2020.166868
Keywords
Ferrofluid; Magnetogranulometry; Inverse Langevin function; Ferrofluid EMG909 from Ferrotec Co
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The magnetization curve of the commercially available ferrofluid EMG909 is measured. It can adequately be described by a superposition of four Langevin terms. The effective dipole strength of the magnetic particles in this fluid is subsequently obtained by a graphical rectification of the magnetization curve based on the inverse Langevin function. The method yields the arithmetic and the harmonic mean of the magnetic moment distribution function, and a guess for the geometric mean and the relative standard deviation. It has the advantage that it does not require a prejudiced guess of the distribution function of the poly-disperse suspension of magnetic particles.
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