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Magnetoelastoelectric coupling in core-shell nanoparticles enabling directional and mode-selective magnetic control
Moumita Dutta1, Kamaraju Natarajan, Soutik Betal
1Department of Electrical and Computer Engineering, University of Texas at San Antonio, San Antonio, TX 78249, USA. moumita.dutta87@gmail.com.
Abstract:
Magnetoelastoelectric coupling in an engineered biphasic multiferroic nanocomposite enables a novel magnetic field direction-defined propagation control of terahertz (THz) waves. These core-shell nanoparticles are comprised of a ferromagnetic cobalt ferrite core and a ferroelectric barium titanate shell. An assembly of these nanoparticles, when operated in external magnetic fields, exhibits a controllable amplitude modulation when the magnetic field is applied antiparallel to the THz wave propagation direction; yet the same assembly displays an additional phase modulation when the magnetic field is applied along the propagation direction. While field-induced magnetostriction of the core leads to amplitude modulation, phase modulation is a result of stress-mediated piezoelectricity of the outer ferroelectric shell.
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