The paper investigates the experimental and numerical problems related to the macroscopic hysteresis modelling of the soft magnetic core-shell nanoparticles made by FeNi3 nanoparticles, encapsulated in alumina (Al2O3) shells. The well-known classical Preisach model was improved by using a Lagrange polynomial interpolation of the numerical Everett integrals and a precise management of the Preisach history line. The numerical tests show an adequate accuracy of the proposed model – error less than 3.2 % for minor hysteresis cycles, even some perturbations occur in the measured data.

Keywords: Hysteresis, Preisach model, Magnetic nanoparticles, Nanopowder, Core-shell nanoparticle, Numerical accuracy