Tunable Magnetoelectric Response in Cofired (Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3)/CoFe2O4 Laminated Composite
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Magnetoelectric (ME) composites exhibiting strain-mediated coupling are gaining increasing interest for applications. In this paper, an enhancement of ME response on simple lead-free laminated composites (80Bi0.5Na0.5TiO3-20Bi0.5K0.5TiO3)/CoFe2O4 (BNKT/CFO) prepared by a modified cofiring processing were demonstrated, by analyzing the effect of thickness variation on ME properties. The coexistence of independent BNKT and CFO phase and the presence of a clear and well-bonded interface were confirmed. Specifically, the maximum ME voltage coefficient of laminated composite reached up to 74.59 mV/(cm·Oe) with an optimized BNKT/CFO layer thickness ratio of 1:2. The static elastic model and the equivalent circuit model were used to determine the interface coupling. Also, there is a large magnetodielectric (MD) response up to 5.1% in a magnetic field of 8 kOe. Tuning the layer thickness, the ME response of laminated composite is further optimized, which is of significance in development of magnetic-field-tuned electronic devices.
KeywordsMagnetoelectricity laminated composite cofiring processing thickness dependence
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This work was supported by the National Key Research and Development Program of China (grant no. 2017YFA0204600) and the National Natural Science Foundation of China (grant no. 51902104).
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