Excitation-Current-Dependent Magnetoinductance in Inductive Elements Containing CoFeSiB Ribbons Annealed in Transverse Magnetic Field

An important issue for the practical application of magnetic field elements is to select an appropriate operating condition. The effect of excitation parameters on the magnetoinductance effect has been investigated in inductive elements consisting of a magnetically annealed Co 67 Fe 4 Si 14.5 B 14.5 amorphous ribbon wound with a single coil loaded with an excitation current ( I ac ). The influence of the frequency on the magnetoinductance effect is closely related to the amplitude of I ac . With an increase of the amplitude of I ac from 1.0 mA to 4.0 mA, the curve of the maximum magnetoinductance ratio ( η max ) versus frequency changes from a monotonic reduction to show a peak of about 2450% at 32.1 kHz. The local average sensitivity ( S loc ) remains almost the same across a wider magnetic field range from 0 A m −1 to 32 A m −1 under an excitation current of 4.0 mA at 2.1 kHz. These results demonstrate that both the magnetic field sensitivity and linear measurement range of such inductive elements closely depend on the parameters of I ac , which is discussed herein from the viewpoint of the magnetization dynamics and definition of inductance.