Effect of preparation conditions on magnetoelectric properties of CoFe2O4–BaTiO3 magnetoelectric composites

Chemical Bonding Assembly of Multifunctional Oxide Nanocomposites

“…5b), assigned to a higher composite density (93% of the theoretical maximum for the 1 200 °C sample). The mechanical coupling between the FE and FM phases becomes more efficient as the sample density increases, explaining this result 30. The CFO XRD‐derived particle size increases with sintering temperature (see the Supporting Information, Fig.…”

“…7). The values of H max in these composites are comparable to the fields at which the coupling coefficient k = λ d λ /d H is maximized (1.57 kOe – here λ is the magnetostriction of the ferrite component) 30. Variation from this value can be attributed to microstructure control of domain wall motion – the higher H c in the smaller CFO particle size composite is due to more numerous pinning sites, which therefore require a higher field to saturate the magnetostriction.…”

“…Amongst these are the magnetostriction ( λ ) of the magnetic component and the piezoelectric constant d 33 (the induced charge per unit force applied in the same direction) of the ferroelectric component. The effectiveness of the mechanical coupling between the phases30 is also crucial (i.e., the composite density, so that the deformation due to magnetostriction in the FM phase can be transferred to the FE phase), as is the size of the interface between the FE and FM components, which can be thought of as the degree of component particle dispersity in particulate composites. The composition (the relative amounts of FE and FM phases)23 and the connectivity31 of the composite are also important.…”

Lead free heterogeneous multilayers with giant magneto electric coupling for microelectronics/microelectromechanical systems applications

“…This surface effect contributes largely to the magneto electric coupling. 18 Also, charge redistribution induced by the interfacial boundaries of the ferroelectric layer may also induce changes in ferromagnetic ordering as per the polarization direction and thereby contributing to the giant magnetoelectric response. 27 The investigation directly points towards the possible applications in the microelectronics and MEMS industry.…”

“…However, the coupling coefficient dropped substantially at biasing magnetic fields above 20 Oe. 17 Duong and Groessinger 18 in 2007 reported that microstructure of the ferroelectric and ferromagnetic layers of ME composites also plays an important role in deciding the ME effects.…”