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The magnetoimpedance spectra (0≤f≤3 MHz) of amorphous and of nanocrystallized (550°C annealing for 0.5-18 h) FeCuNbSiB ribbons were measured at room temperature using a commercial impedance analyzer as a function of applied magnetic field up to 75 Oe. The magnetoimpedance (MI), Z(f, H), shows strong dependence on frequency of the drive, ac current and magnetic field. For all the samples, the MI ratio...
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