The magnetoimpedance (MI) phenomenon has become a significant area of research due to the current development in the applications in magnetic sensor technology and the uses of ‘composites” as smart sensors [1].

Exchange springs (ES) are multilayer structures composed of alternating hard and soft magnetic materials that are coupled through exchange interaction.

A fundamental characterization technique for the current research in spintronics is the ferromagnetic resonance (FMR) spectroscopy.