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Materials (Basel). 2017 Dec 23;11(1). pii: E18. doi: 10.3390/ma11010018.

Multiferroic Core-Shell Nanofibers, Assembly in a Magnetic Field, and Studies on Magneto-Electric Interactions.

Author information

1
Physics Department, Oakland University, Rochester, MI 48309, USA. sreeni@vt.edu.
2
Physics Department, Oakland University, Rochester, MI 48309, USA. jitaozhang@oakland.edu.
3
College of Electrical and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China. jitaozhang@oakland.edu.
4
Physics Department, Oakland University, Rochester, MI 48309, USA. zhangruwl@njtech.edu.cn.
5
Physics Department, Oakland University, Rochester, MI 48309, USA. maxim_popov@univ.kiev.ua.
6
Faculty of Radiophysics, Electronics and Computer Systems, Taras Shevchenko National University of Kyiv, Kyiv 01601, Ukraine. maxim_popov@univ.kiev.ua.
7
Physics Department, Oakland University, Rochester, MI 48309, USA. vladimir.petrov@novsu.ru.
8
Institute of Electronic and Information Systems, Novgorod State University, Veliky Novgorod 173003, Russia. vladimir.petrov@novsu.ru.
9
Physics Department, Oakland University, Rochester, MI 48309, USA. srinivas@oakland.edu.

Abstract

Ferromagnetic-ferroelectric nanocomposites are of interest for realizing strong strain-mediated coupling between electric and magnetic subsystems due to a high surface area-to-volume ratio. This report is on the synthesis of nickel ferrite (NFO)-barium titanate (BTO) core-shell nanofibers, magnetic field assisted assembly into superstructures, and studies on magneto-electric (ME) interactions. Electrospinning techniques were used to prepare coaxial fibers of 0.5-1.5 micron in diameter. The core-shell structure of annealed fibers was confirmed by electron microscopy and scanning probe microscopy. The fibers were assembled into discs and films in a uniform magnetic field or in a field gradient. Studies on ME coupling in the assembled films and discs were done by magnetic field (H)-induced polarization, magneto-dielectric effects at low frequencies and at 16-24 GHz, and low-frequency ME voltage coefficients (MEVC). We measured ~2-7% change in remnant polarization and in the permittivity for H = 7 kOe, and a MEVC of 0.4 mV/cm Oe at 30 Hz. A model has been developed for low-frequency ME effects in an assembly of fibers and takes into account dipole-dipole interactions between the fibers and fiber discontinuity. Theoretical estimates for the low-frequency MEVC have been compared with the data. These results indicate strong ME coupling in superstructures of the core-shell fibers.

KEYWORDS:

composites; ferroelectric; ferromagnetic; magneto-electric; multiferroic

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