Realization of Enhanced Magnetoelectric Coupling and Raman Spectroscopic Signatures in 0-0 Type Hybrid Multiferroic Core-Shell Geometric Nanostructures

Multiferroic heterostructures' contribution to the persistent growth of ultrafast wireless communications may pave the way for future 5G technology. In line with this, we herein report the development of an engineered hybrid multiferroic core-shell nanostructure with a soft magnetic core and a ferroelectric shell. In this system, the attributes of the ferromagnetic core were modulated by a ferroelectric coating over it, in order to impart a bifunctionality to it and thus induce magnetoelectric coupling in it for multifunctional device applications. The phase, crystal structure and morphology of these composites have been investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and confocal Raman spectroscopy. The origin of strain mediated magnetoelectric coupling effect at the ferromagnetic core and ferroelectric shell interface was also investigated. Raman spectroscopy is efficiently utilized to manifest the multiferroism in the core-shell samples. High resolution transmission electron microscopy images and domain structure mapping using confocal Raman microscopy along with Raman images substantiate the core-shell nature of the samples. The findings manifest how tuning of the ferromagnetic phase influences the magnetoelectric coupling at the interface and reveal novel approaches for manipulating the attributes of a ferromagnetic-ferroelectric interface for innovative device applications. The outcome of the experiments indicates an energy efficient move toward the control of the E-field by the magnetic field, which demonstrates an enormous prospective for novel low power electronic, magnonic, and spintronic devices.