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Multiferroic CoFe2O4–BiFeO3 core–shell nanofibers and their nanoscale magnetoelectric coupling

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Abstract

Multiferroic CoFe2O4–BiFeO3 (CFO–BFO) core–shell nanofibers were synthesized by coaxial electrospinning. The spinel structure of CFO and perovskite structure of BFO were confirmed by x-ray diffraction and high-resolution transmission electron microscopy. The core–shell configuration of nanofibers was verified by scanning electron microscopy and transmission electron microscopy images. The macroscopic ferromagnetic property of core–shell nanofibers was demonstrated by magnetic hysteresis loop. The local magnetoelectric (ME) coupling was confirmed by using dual frequency piezoresponse force microscopy (PFM) under an external magnetic field, showing magnetically induced evolution of piezoresponse and domain structure. The ferroelectric characteristics are demonstrated by the switching spectroscopy PFM. From PFM hysteresis and butterfly loops, it is observed that the piezoresponse amplitude is reduced while coercive voltage increased under external in-plane magnetic field, induced through the mechanical interactions between magnetostrictive CFO and piezoelectric BFO, from which the lateral ME coupling can be estimated quantitatively. The nanofibers thus can find a variety of applications as a one-dimensional multiferroic material.

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ACKNOWLEDGMENTS

We acknowledge the support of Natural Science Foundation of China (Approval Nos. 11372268, 11102175, and 51375017), and Provincial Natural Science Foundation of Hunan (13JJ1019).

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Authors and Affiliations

  1. Faculty of Materials, Optoelectronics and Physics, Xiangtan University, Xiangtan, Hunan, 411105, China

    Qingfeng Zhu, Ying Xie & Jing Zhang

  2. Department of Mechanical Engineering, University of Washington, Seattle, Washington, 98195, USA

    Yuanming Liu

  3. Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China

    Qingfeng Zhan

  4. State Key Lab for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing, 100871, China

    Hongchen Miao

  5. Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, Xiangtan University, Xiangtan, Hunan, 411105, China

    Shuhong Xie

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  1. Qingfeng Zhu
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Correspondence to Shuhong Xie.

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These authors contributed equally to the work.

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Zhu, Q., Xie, Y., Zhang, J. et al. Multiferroic CoFe2O4–BiFeO3 core–shell nanofibers and their nanoscale magnetoelectric coupling. Journal of Materials Research 29, 657–664 (2014). https://doi.org/10.1557/jmr.2014.36

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