Modeling the Hysteresis Loop of the Nanocomposite Material Using Modified Hyperbolic T(x) Model

Abstract

The paper presents possibilities of hysteresis loop decomposition onto the magnetization components. The reversible and irreversible magnetization changes describe processes, which are inuencing reversal magnetization in studied permanent magnets. Further, these components are used for modelling the recoil curves using modied hyperbolic T (x) model.

Study on the magnetization-reversal behavior of annealed Sm-Fe-Co-Si-Cu ribbons

“…The linear one is used for describing the reversible magnetization changes. In this research the authors used the T(x) model modified by Dooepial, 15,16 describing the reversible magnetization component with an anhysteretic sigmoid function. Based on this assumption, the whole reversal magnetization process was described with following Equations: [ ]…”

“…The i and j indexes refer to individual reversible and irreversible magnetization components, respectively, and n irr,rev is their total number. 16 3 RESULTS AND DISCUSSION Figure 1 presents the experimental X-ray diffraction pattern compared with the results of the Rietveld refinement simulation, obtained for the annealed Sm 12 According to the Rietveld refinement, it was found that the studied alloy was composed from Sm 2 Co 17 (22.92 %), SmCo 7 (37.45 %) and SmCo 5 (39.63 %) phases. A lack of one of the less intense peaks on the experimental diffraction pattern, as compared with the simulation, can be associated with the preferred position, occupied by the Cu atoms in the TbCu 7 structure and the use of a copper X-ray source.…”