Giant magnetoimpedance in amorphous and nanocrystalline multilayers

In a frequency range of 0.5-1250 MHz, giant magnetoimpedance (GMI) was studied in multilayered thin-film structures of the F1/SiO 2 Ti/Cu/Ti/SiO 2 /F2 type, where F1 and F2 are ferromagnetic layers prepared by sputtering a target of an amorphous alloy Fe 13.5 Cu 1 Nb 3 Si 16.5 B 6 . At the thicknesses of ferromagnetic layers of 0.8 μm, a high sensitivity of GMI to magnetic field was obtained that exceeded 10%/Oe in the range of high frequencies. A model theory of GMI in thin-film structures was developed; the theory made it possible to qualitatively explain the experimental data obtained.