Nanostructuring effects in soft magnetic films and film elements with magnetic impedance

The magnetization reversal and magnetic impedance (MI) of films and film elements based on Fe$_{19}$Ni$_{81}$ and Fe$_{72.5}$Cu$_{1.1}$Nb$_{1.9}$Mo$_{1.5}$Si$_{14.2}$B$_{8.7}$ alloys with a varied thickness, heat-treatment temperature, and the number of thin Cu interlayers are studied. The dependences of the coercive force and the magnitude of MI on these parameters are found. Layered structuring is shown to be an effective method for improving the functional characteristics of MI elements. In elements containing nanocrystalline Fe$_{19}$Ni$_{81}$ layers, this is related to the restructuring of a magnetic structure; in elements containing amorphous Fe$_{72.5}$Cu$_{1.1}$Nb$_{1.9}$Mo$_{1.5}$Si$_{14.2}$B$_{8.7}$ layers, this improvement is likely to be caused by a decrease in the effective electrical resistivity.