Simulation analysis of the Fe40Ni38B18Mo4 nano-crystalline thin films, in the 0.3–9.6 GHz domain

A simulation analysis of the nano-crystalline thin films of Fe₄₀Ni₃₈B₁₈Mo₄ was performed in this paper, in order to obtain the frequency evolution of the material parameters: electric permittivity, conductivity and magnetic permeability, in microwave domain. Material behaves like a soft magnetic alloy, with positive magnetostriction character. With help of the 3D Full-wave Electromagnetic Field Simulation HFSS from Ansoft the thin film structure was developed and the exposure field parameters were controlled for material parameters determination. Resonant frequency evolutions were obtained for the electric permittivity and magnetic permeability, determined by different aspects of the exposure field interacting with the internal structure (macro and micro domains). Electric conductivity presents an increasing evolution with frequency, describing the fact that currents appears easier inside the structure when frequency increases. Conclusions were polarized on frequency evolution interpretation for the material parameters and applications.