High Frequency Magneto-Impedance Measurements in Amorphous Wires

M. Tibu, S. Corodeanu, H. Chiriac

Abstract

Magneto-impedance spectra in 100 kHz - 14GHz frequency range were measured at different magnetic fields in CoFeSiB amorphous wires. Three types of measuring techniques were used for three different frequency ranges (100 kHz- 110 MHz, 1 MHz – 3 GHz, 10 MHz – 14 GHz), the results were compared in order to establish the accuracy of the measurements and the limitation of each measuring cell. For each measuring technique there is a frequency domain determined by the measuring cell characteristics (geometry, losses, etc.). Over the maximum limit of the frequency domain unpredictable behavior could appear and the same measurement using different technique did not match. High GMI ratio, up to 400%, was found for CoFeSiB amorphous glass covered microwires at frequencies close to 50 MHz.

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IMEKO-TC4-2007-168.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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