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Microwave reflection properties of planar anisotropy Fe50Ni50 powder/paraffin composites |
Wei Jian-Qiang(位建强), Zhang Zhao-Qi(张钊琦), Han Rui(韩瑞), Wang Tao(王涛), and Li Fa-Shen(李发伸)† |
Institute of Applied Magnetics, Key Laboratory of Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou 730000, China |
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Abstract The reflection properties of planar anisotropy Fe50Ni50 powder/paraffin composites have been studied in the microwave frequency range. The permeability of Fe50Ni50 powder/paraffin composites is greatly enhanced by introducing the planar anisotropy, and can be further enhanced by using a rotational orientation method. The complex permeability can be considered as the superposition of two types of magnetic resonance. The resonance peak at high frequency is attributed to the natural resonance, while the peak at low frequency is attributed to the domain-wall resonance. The simulated results of the microwave reflectivity show that the matching thickness, peak frequency, permeability, and permittivity are closely related to the quarter wavelength matching condition. The Fe50Ni50 powder/paraffin composites can be attractive candidates for thinner microwave absorbers in the L-band (1-2 GHz).
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Received: 14 July 2011
Revised: 30 October 2011
Accepted manuscript online:
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PACS:
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76.50.+g
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(Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)
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75.30.Gw
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(Magnetic anisotropy)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10774061), the Defense Industrial Technology Development Program, China (Grant No. A1420080174), and the Fundamental Research Funds for the Central Universities. |
Corresponding Authors:
Li Fa-Shen,lifs@lzu.edu.cn
E-mail: lifs@lzu.edu.cn
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Cite this article:
Wei Jian-Qiang(位建强), Zhang Zhao-Qi(张钊琦), Han Rui(韩瑞), Wang Tao(王涛), and Li Fa-Shen(李发伸) Microwave reflection properties of planar anisotropy Fe50Ni50 powder/paraffin composites 2012 Chin. Phys. B 21 037601
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