Magnetoelastic Sensor Studies on Amorphous Magnetic FeSiB Wire and the Application in Viscosity Measurement

In this work, possible use of FeSiB amorphous magnetic wire as a magnetoelastic sensor was investigated. As-received wire did not show any magnetoelastic change. But, the wire annealed in a furnace at 465 ^°C for various times showed good magnetoelastic change. A very large change in the resonance frequency of annealed FeSiB wire as a function of DC magnetic field was obtained. This large change was explained on the basis of the high value of magnetostriction of FeSiB wire and the increase in the rotational magnetization process. It was also found that resonance frequency of FeSiB wire changes when the wire was in a liquid with different viscosities.