Microwave absorption properties of a double-layer absorber based on nanocomposite BaFe12O19/α -Fe and nanocrystalline α -Fe microfibers

doi:10.1088/1674-1056/23/7/078101

Abstract The nanocomposite BaFe₁₂O₁₉/α -Fe and nanocrystalline α -Fe microfibers with diameters of 1-5 μm, high aspect ratios and large specific areas are prepared by the citrate gel transformation and reduction process. The nanocomposite BaFe₁₂O₁₉/α -Fe microfibers show some exchange-coupling interactions largely arising from the magnetization hard (BaFe₁₂O₁₉) and soft (α -Fe) nanoparticles. For the microwave absorptions, the double-layer structures consisting of the nanocomposite BaFe₁₂O₁₉/α -Fe and α -Fe microfibers each exhibit a wide band and strong absorption behavior. When the nanocomposite BaFe₁₂O₁₉/α -Fe microfibers are used as a matching layer of 2.3 mm in thickness and α -Fe microfibers as an absorbing layer of 1.2 mm in thickness, the optimal reflection loss (RL) achieves -47 dB at 15.6 GHz, the absorption bandwidth is about 12.7 GHz ranging from 5.3 to 18 GHz, exceeding -20 dB, which covers 72.5% C-band (4.2-8.2 GHz) and whole X-band (8.2-12.4 GHz) and K_u-band (12.4-18 GHz). The enhanced absorption properties of these double-layer absorbers are mainly ascribed to the improvement in impedance matching ability and microwave multi-reflection largely resulting from the dipolar polarization, interfacial polarization, exchange-coupling interaction, and small size effect.

Keywords: BaFe₁₂O₁₉ α-Fe microfiber double-layer absorber

Received: 13 December 2013
Revised: 06 January 2014
Accepted manuscript online:

PACS:	81.07.Bc	(Nanocrystalline materials)
	75.50.-y	(Studies of specific magnetic materials)
	73.21.Ac	(Multilayers)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51274106 and 51202091), the Natural Science Foundation of Jiangsu Provincial Higher Education, China (Grant No. 12KJA430001), the Science and Technology Support Program of Jiangsu Province, China (Grant Nos. BE2012143 and BE2013071), the Jiangsu Provincial Postgraduate Cultivation and Innovation Project, China (Grant No. CXZZ13_0662), and the Priority Academic Program Development of Jiangsu Higher Education Institutions, China (Grant No. 1033000003).

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

About author: 81.07.Bc; 75.50.-y; 73.21.AC

Cite this article:

Shen Xiang-Qian (沈湘黔), Liu Hong-Bo (刘洪波), Wang Zhou (王舟), Qian Xin-Ye (钱昕晔), Jing Mao-Xiang (景茂祥), Yang Xin-Chun (杨新春) Microwave absorption properties of a double-layer absorber based on nanocomposite BaFe₁₂O₁₉/α -Fe and nanocrystalline α -Fe microfibers 2014 Chin. Phys. B 23 078101

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Microwave absorption properties of a double-layer absorber based on nanocomposite BaFe12O19/α -Fe and nanocrystalline α -Fe microfibers

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Microwave absorption properties of a double-layer absorber based on nanocomposite BaFe₁₂O₁₉/α -Fe and nanocrystalline α -Fe microfibers