The Structure Sensitiveness of Magnetism in Metals

Abstract

The magnetic susceptibility of copper, silver, platinum and bismuth was measured for the annealed state and after various degrees of cold work. The cold work consisted of twisting, stretching and pounding. In every case the cold work decreased the diamagnetism (Cu, Ag, Bi), or increased the paramagnetism (Pt). This probably explains the variation in the measured values of metallic susceptibilities as due to a structure sensitiveness. This is attributed to the increase in the paramagnetic contribution of the partly bound electrons of the metal due to the cold work; the electrical conductivity is usually decreased.

Magnetically Retarded Recovery and Recrystallization in Cold Rolled Pure Copper

“…(1), the magnetic free energy is related to the susceptibility. Previous research 14,15) has shown that the magnetic susceptibility of pure copper with diamagnetisme is structurally sensitive. The cold worked pure copper has lower diamagnetic susceptibility than that after annealing.…”

Diffusion in Copper/Cobalt Systems under High Magnetic Fields

“…Similar to Anand et al, another study concluded that the change in the internal energy causes by a high magnetic field has a major effect on the vacancy concentration [ 9 ]. A new vacancy forming in copper (in the diamagnetic matrix) under a high magnetic field may lead to a reduction in the absolute value of susceptibility, which has structural sensitivity [ 33 , 34 ]. Thus, it causes a decline in the magnetic free energy of the unit volume.…”