Electrical and magnetic performance of multilayer structures based on (Co$_{40}$Fe$_{40}$B$_{20}$)$_{33.9}$(SiO$_2$)$_{66.1}$ composite

The dependences of the resistivity and complex magnetic permeability of (Co$_{40}$Fe$_{40}$B$_{20}$)$_{33.9}$(SiO$_2$)$_{66.1}$ composite-based multilayer films on the thickness of different metallic and semiconducting spacers are studied. It is found that in the presence of a continuous spacer with a resistivity on the order of 0.01 $\Omega$ m, the superparamagnetic state of these heterogeneous systems changes to ferromagnetic ordering.