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For conventional plate and disc layered magnetoelectric (ME) composites, theME effect appeared under low bias magnetic fields, which caused by linemagnetostriction. In this paper, we present a new structure ME composites,cylindrical bilayered composites. Unexpectedly, the ME effect also appearedunder high magnetic fields in this cylindrical bilayered Ni-lead zirconatetitanate (PZT) composite. We thought this ME effect caused by volumemagnetostriction. The results showed that the ME voltage coefficient of thecylindrical bilayered composite of Ni-PZT was the sum of aE(l) caused by linemagnetostriction under low bias fields and aE(w) induced by volumemagnetostriction under high fields. At the resonance frequency, aE,A(w)increased linearly with bias magnetic field HDC to 30 V/cm Oe at HDC =8 kOe,and was much larger than aE,A(l) at Hm=0.6 kOe. The novel characteristic of MEvoltage coefficient increased linearly with the rise of HDC after 1 kOe inaxial mode makes the cylindrical composite a promising candidate forapplication in high magnetic field sensor.

Giant magnetoelectric effect under high bias fields in cylindrical bilayered Ni-PZT composites