Experimental Research on The Microcosmic Mechanism of Stress-magnetic Effect For Magnetic Memory Testing

摘要

Influenced by the earth magnetic field, there will exist the irreversible reorientation of domain organization with the characteristic of magnetostriction in internal organization of the loaded ferromagnetic material. The different compressed loads are exerted onto the 20 steel and 40 steel specimens after annealing, which are then made into the metallographic observation test specimens. The magnetic domain structure is observed by the Bitter Method. Then compare the magnetic domain structure pictures of specimens with the same material and under different loads, and analyze different affections of different loads. The experimental results shows that in the occasion of no stress or less stress, the lamellar domains appear in the area，and the domain walls are parallel to the same crystalline grain. The labyrinthian domains appear in company with the concentrated stress increasing，and the harder stress loads, the more labyrinthian domains appear. Meanwhile, the length and the distance between the domain walls change accordingly.