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Comparison of Stress-Impedance Effect in Amorphous Ribbons with Positive and Negative Magnetostriction
Piotr Gazda1, Michał Nowicki2, Roman Szewczyk3
1Warsaw University of Technology, Institute of Metrology and Biomedical Engineering, 02-525 Warsaw, Poland. gazda@mchtr.pw.edu.pl.
Abstract:
The SI (stress-impedance) effect in amorphous ribbons with varying magnetostriction was investigated. Iron- and cobalt-based ribbons with different magnetostriction coefficients were put under tensile stress in a dead weight tester and the impedance change was investigated in function of applied stresses. Significant differences of characteristics are presented. Stress-impedance analog of Villari reversal point was observed. The reversal point showed driving current frequency dependence, in which this point manifests for different stress values. Based on the obtained SI characteristics and magnetoelastic hysteresis, the most appropriate stress-sensing material was selected for development of precise small forces sensor.
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