Effects of piezoelectric-phase orientations on magnetoelectric coefficient in AlN–FeCoSiB multiferroic composites
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In this study, orientation dependences of ps11′, ps12′, pε33′ and d31′ for piezoelectric phase were investigated along arbitrary directions using relative experimental data and original matrices for AlN with point group of 6mm. Then, effects of various orientations of piezoelectric phase on magnetoelectric coefficient of AlN–FeCoSiB laminated multiferroic composites were studied. It was found that ps11′ is a constant while ps12′, pε33′ and d31′ exhibit high dependence on crystal orientations with their MAX values existing along -axis. The magnetoelectric coefficient αE33′ increases with decreased angle θ apart from c-axis of AlN in range of 90°–0°; the MAX αE33′ = 5405 mV/cm Oe exists in AlN ∥ —FeCoSiB. Along specific preferred orientations of piezoelectric phase, twofold–fivefold of enhancement of αE33 can be obtained compared to randomly arranged composites. Volume fraction is found to be independent of orientations of component phases, and the volume fraction for magnetic phase f around 0.75 obtains the largest αE33. The results suggest an approach of enhancing magnetoelectric coefficient of composite multiferroic materials through crystal-orientation controls of single crystals or textured ceramics.
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The authors declare that they have no conflict of interest.
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