Enhancement of microwave absorption of nanocomposite BaFe12O19/α-Fe microfibers

doi:10.1088/1674-1056/22/5/058101

Abstract Nanocomposite BaFe₁₂O₁₉/α-Fe microfibers with diameters of about 1-5 μm are prepared by the organic gel-thermal selective reduction process. The binary phase of BaFe₁₂O₁₉ and α-Fe is formed after reduction of the precursor BaFe₁₂O₁₉/α-Fe₂O₃microfibers at 350 ℃ for 1 h. These nanocomposite microfibers are fabricated from α-Fe (16-22 nm in diameter) and BaFe₁₂O₁₉ particles (36-42 nm in diameter) and basically exhibit a single-phase-like magnetization behaviour, with a high saturation magnetization and coercive force arising from the exchange-coupling interactions of soft α-Fe and hard BaFe₁₂O₁₉. The microwave absorption characteristics in a 2-18 GHz frequency range of the nanocomposite BaFe₁₂O₁₉/α-Fe microfibers are mainly influenced by their mass ratio of α-Fe/BaFe₁₂O₁₉ and specimen thickness. It is found that the nanocomposite BaFe₁₂O₁₉/α-Fe microfibers with a mass ratio of 1:6 and specimen thickness of 2.5 mm show an optimal reflection loss (RL) of -29.7 dB at 13.5 GHz and the bandwidth with RL exceeding -10 dB covers the whole Ku-band (12.4-18.0 GHz). This enhancement of microwave absorption can be attributed to the heterotructure of soft, nano, conducting α-Fe particles embedded in hard, nano, semiconducting barium ferrite, which improves the dipolar polarization, interfacial polarization, exchange-coupling interaction, and anisotropic energy in the nanocomposite BaFe₁₂O₁₉/α-Fe microfibers.

Keywords: barium ferrite nanocomposites microfibers microwave absorber

Received: 26 August 2012
Revised: 10 October 2012
Accepted manuscript online:

PACS:	81.05.Zx	(New materials: theory, design, and fabrication)
	81.16.-c	(Methods of micro- and nanofabrication and processing)
	75.50-y
	73.40.Sx	(Metal-semiconductor-metal structures)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51274106 and 51202091), the Natural Science Foundation of Higher Education of Jiangsu Province, China (Grant No. 12KJA430001), the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20103227110006), the Science and Technology Support Program of Jiangsu Province, China (Grant No. BE2012143), and the Postgraduate Cultivation and Innovation Project of Jiangsu Province, China (Grant No. CXZZ11_0557).

Corresponding Authors: Shen Xiang-Qian
E-mail: shenxq@ujs.edu.cn

Cite this article:

Yang Xin-Chun (杨新春), Liu Rui-Jiang (刘瑞江), Shen Xiang-Qian (沈湘黔), Song Fu-Zhan (宋福展), Jing Mao-Xiang (景茂祥), Meng Xian-Feng (孟献丰) Enhancement of microwave absorption of nanocomposite BaFe₁₂O₁₉/α-Fe microfibers 2013 Chin. Phys. B 22 058101

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Enhancement of microwave absorption of nanocomposite BaFe12O19/α-Fe microfibers

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Enhancement of microwave absorption of nanocomposite BaFe₁₂O₁₉/α-Fe microfibers