Difference between stress and magnetism relationships of ferromagnetic materials under tensile and compressive stresses
Gang Huang, Qingdong Zhang, Mingyang Yu
Abstract
This study investigated the difference between the stress–magnetism relationships of ferromagnetic materials under tension and compression. Experimental results showed that the magnetic induction intensity of the ferromagnetic materials increased and decreased linearly with the increasing tensile and compressive stress, respectively, and that the response to tensile stress was more severe. The microstructural effect on the stress–magnetism relationship was studied. Experimental results showed that the difference in magnetic domain structure, grain size, and texture of materials were the important reasons for the different stress-magnetism relationships of different materials. The micromechanism of the stress–magnetism relationship was studied based on first-principles method. The calculation results showed that the atomic magnetic moment of the crystal structure increased and decreased with the increasing tensile and compressive stress, respectively. Moreover, the atomic magnetic moment responded more strongly to the variation in tensile stress, which was consistent with the macroscopic response. The results were explained by both levels in the band structure and the electronic density of states.