Abstract
Magnetoelectric (ME) effect was investigated in various multilayered composites with various magnetostrictive materials Ni, FeNi and FeCo prepared by electroless deposition. Compared with the homogeneous ME composites, Ni/PZT/Ni and FeCo/PZT/FeCo, the ME voltage coefficient αE,31 of graded ME composites with two different magnetostrictive materials exhibit significant hysteresis phenomenon as a function of the external dc magnetic field at low frequency. The zero-biased ME response has been observed and can be attributed to a built-in magnetic field. However, at longitudinal vibration mode the ME voltage coefficient has been weakened in graded ME composites. The zero bias ME coupling observed in composites with graded magnetostrictive materials can be used in magnetic sensors with high sensitivity.
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