Magnetomechanical coupling and variable delay characteristics by means of a giant ΔE effect in iron-rich amorphous ribbon

Abstract

The saturation magnetostriction constants λs of amorphous (Fe0.9Co0.1)xSiyBz and (Fe1−xCox)78Si8B14 ribbons were measured at room temperature by a three terminal capacitance method, and the largest constant λs was found to be 44×10−6 for the composition (Fe0.9Co0.1)0.83B0.14. The magnetomechanical coupling factor k and the giant ΔE effect of the amorphous Fe78Si10B12 ribbons were also observed. These values depended on the annealing of the ribbons in a magnetic field, and were larger than those previously reported. The largest coupling factor was found to be 0.75 for the ribbon annealed at 410 °C for 12 minutes and the largest ΔE effect to be 1.9 for a ribbon annealed at 410 °C for 10 minutes. The variable delay time, by using Fe78Si10B12 ribbons with 20, 15 and 5 μm thick was also measured from 150 kHz to 10 MHz as a function of the frequency.