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

Published online by Cambridge University Press:  04 March 2014

Qingfeng Zhu ,
Ying Xie ,
Jing Zhang ,
Yuanming Liu ,
Qingfeng Zhan ,
Hongchen Miao  and
Shuhong Xie
Qingfeng Zhu
Affiliation:
Faculty of Materials, Optoelectronics and Physics, Xiangtan University, Xiangtan, Hunan 411105, China
Ying Xie*
Affiliation:
Faculty of Materials, Optoelectronics and Physics, Xiangtan University, Xiangtan, Hunan 411105, China
Jing Zhang
Affiliation:
Faculty of Materials, Optoelectronics and Physics, Xiangtan University, Xiangtan, Hunan 411105, China
Yuanming Liu
Affiliation:
Department of Mechanical Engineering, University of Washington, Seattle, Washington 98195
Qingfeng Zhan
Affiliation:
Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Hongchen Miao
Affiliation:
State Key Lab for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, China
Shuhong Xie*
Affiliation:
Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, Xiangtan University, Xiangtan, Hunan 411105, China
*
b)Address all correspondence to this author. e-mail: [email protected]
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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.

Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 5 , 14 March 2014 , pp. 657 - 664
Copyright
Copyright © Materials Research Society 2014 

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