Magnetic hysteretic properties of submicron grained nickel and their variations upon annealing

Abstract Magnetic hysteretic properties of high purity nickel were studied in a broad range of structural states from a submicron grained state achieved by means of large deformation on the Bridgman anvils to a coarse-grained state obtained after high-temperature annealing. The structure was studied in different states using electron microscopy and X-ray analysis. At the initial state, the coercivity ( H c ) of 5.1 kA/m was achieved for nickel. The contribution of intragrain dislocations and grain boundaries to the value of the coercivity was shown. The value of residual magnetization I r = 0.5 I s obtained for a highly strained state coincides with the theoretically calculated value. Factors causing a sufficiently complicated dependence of I r on the annealing temperature are specified.