Abstract
A giant magnetoelectric voltage coupling coefficient without direct current magnetic field observed in NiFe2O4–BaTiO3 particulate composite is reported. The particulate composite was obtained by combining hydrothermal and sol–gel method, and was studied for their crystallographic structure, morphology, magnetic, dielectric and magnetoelectric properties. Results of Mössbauer spectra demonstrated the presence of interface phase in particulate composite, where the changes of the magnetic properties in composite compared to the pure NiFe2O4 also confirmed this. The particulate composite exhibits remarkable magnetoelectric effect through both static measurement and dynamic measurement. The special magnetoelectric property of the particulate composite is beneficial for applications in high frequency devices.
Highlights
Multiferroic composites are usually made by combining ferroelectric and magnetic phases, and could have various connectivity schemes, but the common connectivity schemes are 0–3–type particulate composites, 2–2–type laminate composites, and 1–3–type ber composites with bers of one phase embedded in the matrix of another phase.[2]
Further analysis results indicate that BTO exhibits a tetragonal structure because the (200) and (211) diffractions are broader than the (111) peak, which means that BTO has a polar structure in particulate composite (PC).[33,34]
Peaks corresponding to the perovskite phase are not split as they should be for bulk BTO at room temperature (RT), this indicates that the tetragonal distortion of the unit cell is small
Summary
Multiferroics in which two or more ‘ferroic’ properties such as ferroelectricity, ferromagnetism and ferroelasticity can coexist and be coupled to each other have attracted much attention in recent years.[1,2,3,4] Because of the magnetoelectric (ME) coupling effect, multiferroics display novel physical phenomena[5,6,7] and can be used as magnetic probes, transducers, novel actuators, sensors and magnetic eld tunable microwave devices.[8,9,10,11,12] Generally, ME coupling is characterized by an electric polarization response to an applied magnetic eld or a magnetic polarization response to an applied electric eld. The presence of interface phase is demonstrated by Mossbauer spectra and magnetic properties analysis in the PC.
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