Influence of the Parameters of Permalloy-Based Multilayer Film Structures on the Sensitivity of Magnetic Impedance Effect

The effect of the number and thickness of permalloy layers and the thickness and material of interlayers on the value of magnetic impedance (MI) effect of multilayer film structures is theoretically analyzed in this work. The distributions of electromagnetic fields over the thickness of the film structure and MI are obtained on the basis of the joint solution of the Maxwell equations and the Landau–Lifshitz equation. The performed analysis shows that the MI increases with decreasing number of permalloy layers and corresponding increase in their thickness. It is established that the values of conductivities of the central nonmagnetic layer and interlayers influence the MI value differently. It is predicted that a further increase in MI may be achieved by using interlayers made of ferromagnetic materials.