W-type hexaferrite nanoparticles: A consideration for microwave attenuation at wide frequency band of 0.5-10 GHz

Muhammad Javed Iqbal, Rafaqat Ali Khan, Shigeru Takeda, Shigemi Mizukami, Terunobu Miyazaki

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45 Citations (Scopus)


The static and dynamic magnetic properties of W-type hexaferrites are tuned to meet the requirements of wide band frequencies for attenuation of electromagnetic interference and microwave absorptions purposes. For this purpose, the W-type hexaferrite of entirely new composition of BaCoZnFe 16-2yAlyCeyO27 (y = 0, 0.2, 0.4, 0.6, 0.8 and 1.0) has been synthesized by the chemical co-precipitation. The material is characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). The complex permittivity (εr = ε′ - jε″) and permeability (μr = μ′ - jμ″) spectra are determined using Vector Network Analyzer (VNA) in a range from 0.5 GHz to 10 GHz. During this study, it is noticeable that the Al3+ and Ce 3+ ions have considerable effect on the shape of the nanoparticles. Samples having Al-Ce contents y = 0.2 and y = 0.4 showed large values for magnetization (70.5 emu/g) and remanent magnetization (32.9 emu/g). In addition, more than 99% absorption (>-20 dB) is noted for this sample composition. Based on these results it is concluded that the microwave absorption characteristics of these compounds can be tuned for the required frequency by varying the thickness of the absorber. Due to this reason, potential employment of the synthesized nanoparticles for absorption of electromagnetic radiations at wide frequency band of 0.5-10 GHz has been proposed.

Original languageEnglish
Pages (from-to)7618-7624
Number of pages7
JournalJournal of Alloys and Compounds
Issue number28
Publication statusPublished - 2011 Jun


  • Chemical synthesis
  • Magnetic measurements
  • Microstructure
  • Microwave absorption
  • Permanent magnets


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