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Magnetoelastoelectric coupling in core-shell nanoparticles enabling directional and mode-selective magnetic control of THz beam propagation

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 the amplitude modulation, the phase modulation is a result of stress-mediated piezoelectricity of the outer ferroelectric shell.

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Publication details

The article was received on 17 May 2017, accepted on 06 Aug 2017 and first published on 07 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR03504G
Citation: Nanoscale, 2017, Accepted Manuscript
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    Magnetoelastoelectric coupling in core-shell nanoparticles enabling directional and mode-selective magnetic control of THz beam propagation

    M. Dutta, K. Natarajan, S. Betal, R. P. Prasankumar, A. Bhalla and R. Guo, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03504G

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