Magnetic properties and giant magneto-impedance in nanocrystalline FeCuCrVSiB films

The giant magneto-impedance (GMI) effect has been observed in nanocrystalli ne FeCuCrVSiB films prepared by rf sputtering followed by an annealing trea tment. The magnetic properties and the longitudinal and transverse GMI have been studied in detail. Field dependence and frequency spectra of GMI effe ct have been studied in the frequency range from 100 kHz to 13 MHz. Maximum GMI ratios as large as 50% and 25% were obtained at 13 MHz in the longitud inal and transverse cases, respectively. The field sensitivity of the longi tudinal GMI is about 0.11% m/A at 13 MHz. The dependence of effective perme ability on the frequency and magnetic field has been investigated.