Abstract
Magnetostrictive fiber composites (MFC) based on nickel wires with a diameter of 150 μm, arranged parallel to each other and immersed in a polymer matrix, were fabricated. The field and angular dependences of the MFC magnetostriction have been investigated. Direct magnetoelectric (ME) effect in a two-layered composite structure consisting of a layer of PZT and MFC piezoelectric ceramics has been studied. The frequency, field, and angular dependences of the magnetoelectric (ME) voltage in the PZT-MFC structure are obtained. The highest ME coefficient α1 = 1.7 V/(Oe • cm) was obtained at a frequency of 7.86 kHz with a parallel orientation of the magnetic field relative to the wires. The anisotropy of the ME effect was found. It arises due to the anisotropy of the MFC magnetostriction. It is shown that as a result of the influence of the demagnetizing factor ME voltage decreases with an increase in the angle between the direction of the magnetic field and the axis of the wires. At the same time magnetic field Hm in which ME voltage reaches its maximum increases. A theoretical approach to the change in the ME voltage from the angle between the direction of the magnetic field and the axis of the wires is presented as well.
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