Theory of Magnetization of Supermagnetics. Curie Law for Magnetic Fluid

Author: Simon Chkhaidze
Co-authors: A. Ugulava, Sh. Kekutia
Keywords: Superparamagnetics, magnetic liquids
Annotation:

The internal energy of magnetic anisotropy for some nanoparticles dominates over the thermal energy even at room temperature. Strong magnetic anisotropy of nanoparticles can significantly affect the process of magnetization of the magnetic fluid. In this work, it is shown that the magnetization curve of the magnetic fluid containing strongly anisotropic nanoparticles differs from that of Langevin. It is located between the Langevin and hyperbolic tangent curves. It is shown that with increasing anisotropy the magnetization curve takes progressively the hyperbolic tangent shape. It is also shown that the strong anisotropy of nanoparticles of the magnetic fluid leads to a substantial correction in the Curie law. Theoretical calculations of the Curie constant are in agreement with the corresponding experimental measurements.