Nanoscale characterization and magnetic reversal mechanism investigation of electrospun NiFe2O4 multi-particle-chain nanofibres

Junli Zhang; Jiecai Fu; Guoguo Tan; Fashen Li; Caiqin Luo; Jianguo Zhao; Erqing Xie; Desheng Xue; Haoli Zhang; Nigel J Mellors; Yong Peng

doi:10.1039/C2NR00024E

Nanoscale characterization and magnetic reversal mechanism investigation of electrospun NiFe₂O₄ multi-particle-chain nanofibres†

Junli Zhang,‡^a Jiecai Fu,‡^a Guoguo Tan,^a Fashen Li,^a Caiqin Luo,^a Jianguo Zhao,^c Erqing Xie,*^a Desheng Xue,^a Haoli Zhang,^d Nigel J Mellors^b and Yong Peng*^a

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* Corresponding authors

^a Key Laboratory of Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou 730000, P. R. China
E-mail: pengy@lzu.edu.cn, xieeq@lzu.edu.cn
Fax: +86 9318912616
Tel: +86 9318912425

^b Nano Materials Group, School of Computing, Science and Engineering, University of Salford, Greater Manchester M5 4WT, UK
E-mail: N.J.Mellors@salford.ac.uk

^c College of Physics and Electronic Information, Luoyang Normal College, Luoyang, P. R. China

^d State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China

Abstract

NiFe₂O₄ multi-particle-chain nanofibres have been successfully fabricated using electrospinning followed by calcination, and their morphology, chemistry and crystal structure were characterized at the nanoscale. Individual NiFe₂O₄ nanofibres were found to consist of many nanocrystallites stacked along the nanofibre axis. Chemical analysis shows that the atomic ratio of Ni : Fe is 1 : 2, indicating that the composition was NiFe₂O₄. The crystal structure of individual NiFe₂O₄ multi-particle-chain nanofibres proved to be polycrystalline with a face centered cubic (fcc) structure. The nanocrystallites in the nanofibres were revealed to have a single-crystal structure with random crystallographic orientations. The magnetic measurements reveal that the NiFe₂O₄ multi-particle-chain nanofibres have a coercivity force of 166 Oe. A “chain of sheets” micromagentism model was proposed to interpret the observed magnetic behaviour of the NiFe₂O₄ multi-particle-chain nanofibres. Simulation studies of the coercivity are in good agreement with the experimental results at room temperature. It is believed that this work will significantly expand the use and application of these compounds in the field of biomagnetic nano-devices and improve understanding of the magnetic origin of spinel ferrites.

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Nanoscale characterization and magnetic reversal mechanism investigation of electrospun NiFe₂O₄ multi-particle-chain nanofibres†

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Nanoscale characterization and magnetic reversal mechanism investigation of electrospun NiFe₂O₄ multi-particle-chain nanofibres

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