Abstract
Size effects have been analyzed in the sensitivity and in the equivalent magnetic noise of three-layered ME sensors, working at the magnetoelastic resonance frequency of the magnetostrictive constituents. These effects have been studied in laminates of 4, 3 and 2cm long, fabricated with metallic glasses of Fe64Co17Si7B12 and with the piezoelectric polymer PVDF. It has been observed a decrease in the sensitivity to the applied AC and DC magnetic fields as reducing the length of the sensor. In the same way, the equivalent magnetic noise measurements performed in a mu-metal magnetic shielding chamber show a worsening in the performance of the sensors as reducing their length, ranging from 20pT/Hz1/2 for the 4cm long ME sensor down to 103pT/Hz1/2 for the 2cm one.
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