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Strong Magnetoelectric Coupling Effect in BaTiO3@CoFe2O4 Magnetoelectric Multiferroic Fluids

Abstract

Magnetoelectric multiferroic fluids composed of BaTiO3@CoFe2O4 composite nanoparticles dispersed into highly insulating nonpolar oleic acid/silicone oil mixture have been elaborated. The effects of particle volume fraction, magnetic field as well as electric field on the ferroelectric and magnetic properties as well as the magnetoelectric coupling effect have been systematically studied and discussed in this paper. The magnetic characterization shows approximative superparamagnetism, both the remanent magnetization(Mr) and the coercive field(Hc) increase with the increase of volume fraction and the applied electric field. Similarly, superparaelectric state has been observed of the multiferroic fluids, of which both the remanent polarization(Pr) and coercive field(Ec) are near zero, while they enhance with increasing applied magnetic field and volume fraction. Large converse and direct magnetelectric coupling coefficients are estimated to be H = 8.16×10-4 Oe.cm/V and E = 1.58 ×104 V/cm.Oe, respectively. Further analysis indicates that the composite particles can be aligned under external magnetic/electric field so that their magnetic/electric moments can be parallel to external field which in turn results in the changes of the magnetization/polarization directions. These results imply that besides these magnetoelectric fluids consisted of core shell structured nanoparticles, conventional multiferroic fluids based on composite particles may have an opportunity to gain electrical control of magnetization and vice versa, implying potentional applications.

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Publication details

The article was received on 22 Mar 2018, accepted on 06 Jun 2018 and first published on 07 Jun 2018


Article type: Communication
DOI: 10.1039/C8NR02368A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Strong Magnetoelectric Coupling Effect in BaTiO3@CoFe2O4 Magnetoelectric Multiferroic Fluids

    R. Gao, Q. Zhang, Z. Xu, Z. Wang, W. Cai, G. Chen, X. Deng, X. Cao, X. Luo and C. Fu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR02368A

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