Co1-xZnxFe2O4 nanofiber：Synthesized by electrospinning and its magnetic properties

doi:10.1088/1674-1056/23/3/037505

Abstract Well-aligned and uniform Co_0.8Zn_0.2Fe₂O₄ nanofibers (NFs) are prepared by electrospinning via sol–gel and subsequent heat treatment. Each of the as-spun NFs has a diameter of about 300 nm and a smooth surface morphology. The scanning electron microscope (SEM) image shows that the diameter decreases to 70 nm after the Co_0.8Zn_0.2Fe₂O₄ NF has been annealed at 650 ℃ for 3 h. The structure and chemical of Co_0.8Zn_0.2Fe₂O₄ NF are investigated by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS), respectively. Single phase cubic spinel structure, Co_0.8Zn_0.2Fe₂O₄ NF, is successfully obtained after having been calcined at 550 ℃ in air for 3 h, and a reduced lattice constant of the Co_0.8Zn_0.2Fe₂O₄ NF provides the evidence of effective Zn²⁺ substitution. The magnetic measurements show that the substitution of Zn²⁺ for Co²⁺, i.e., the introduction of non-magnetic Zn²⁺ ions into A sites, can increase the saturation magnetization (M_s) and reduce the coercivity (H_c). The obtained H_c results of different samples reveal that the critical single-domain size of the Co_0.8Zn_0.2Fe₂O₄ NF is approximately 44 nm. By doping Zn²⁺ with different concentrations, the morphologies of Co_1-xZn_xFe₂O₄ (0≤ x ≤ 0.5) NFs do not show obvious changes. For magnetic properties, the M_s increases and H_c decreases monotonically, respectively.

Keywords: alignment Co_0.8Zn_0.2Fe₂O₄ single-domain Co_1-xZn_xFe₂O₄

Received: 31 May 2013
Revised: 19 July 2013
Accepted manuscript online:

PACS:	75.50.Gg	(Ferrimagnetics)
	75.75.Cd	(Fabrication of magnetic nanostructures)
	75.75.-c	(Magnetic properties of nanostructures)
	75.60.-d	(Domain effects, magnetization curves, and hysteresis)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50873047) and the Foundation of Gansu Education Department, China (Grant No. 0603-02).

Corresponding Authors: Dai Jian-Feng
E-mail: daijf@lut.cn

Cite this article:

Dai Jian-Feng (戴剑锋), Lu Rui-E (路瑞娥), Fu Bi (付比), Gao Kun (高锟), Zhang Liang-Liang (张亮亮) Co_1-xZn_xFe₂O₄ nanofiber：Synthesized by electrospinning and its magnetic properties 2014 Chin. Phys. B 23 037505

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Co1-xZnxFe2O4 nanofiber：Synthesized by electrospinning and its magnetic properties

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Co_1-xZn_xFe₂O₄ nanofiber：Synthesized by electrospinning and its magnetic properties