Investigation on the Magnetic Noise of Stacked Magnetostricitive-Piezoelectric Laminated Composites

The performance of multi-segments magneto-electric (ME) layered sensors as charge sources has been investigated by using a typical charge amplifier. We found that the intrinsic performance of such sensors consisting of several (namely 3 and 5) segments, is the same whether these segments are connected in parallel or in series. Both, the signal detecting capacity and the intrinsic noise source of ME layered sensors depend on the volume of sensor. We have measured an equivalent magnetic noise of about 1 nT√Hz at 1 Hz and as low as 10 pT√Hz in the white noise region