Study on the magnetic shielding properties of nanocrystalline strips under bending stress

Abstract

The study of the magnetic properties of nanocrystalline materials under stress is of great significance for the construction of small and lightweight magnetic shielding rooms. Therefore, this paper investigates the effect of stress on the magnetic properties of nanocrystalline materials under the action of external bending stress. By comparing the test results of the soft magnetic measuring device with and without bending stress, it is found that the magnetic permeability (μi) decreases by about 51.41% when the introduced bending stress σ is increased by about 5.96"×" 107 pa, whereas the "K" _"u" ^"Fe-Si" (induced magnetic anisotropy constant) and "H" _"k" (field of magnetic anisotropy) increase by 5.30"×" 102 J/m3and 1.08"×" 102 A/m, respectively. The Jiles-Atherton (J-A) model considering the bending stress and radius of change correlation is established, and the typical parameters of the J-A model are fitted using the Gazelle Optimization Algorithm (GOA), and the RMSE (root mean square error) of all of them are less than 0.056 T. The magnetic domain density increased with the increase of bending stress, which verified the correlation between the J-A model parameters and the bending stress. Our results reveal that the nanocrystalline macroscopic and micromechanical magnetic properties can be effectively combined with the J-A model, which will provide a theoretical basis for the simulation study of the nanocrystalline magnetic shielding device in the actual stress situation.