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Open AccessArticle

Structural, Magnetic and Microwave Characterization of Polycrystalline Z-Type Sr3Co2Fe24O41 Hexaferrite

1
Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria
2
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Academy Georgi Bonchev Street, bld. 11, 1113 Sofia, Bulgaria
3
Greenmat, Chemistry Department, University of Liege, 11 allée du 6 août, 4000 Liège, Belgium
4
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Ul. Okólna 2, 50-422 Wroclaw, Poland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(10), 2355; https://doi.org/10.3390/ma13102355
Received: 3 April 2020 / Revised: 12 May 2020 / Accepted: 19 May 2020 / Published: 20 May 2020
(This article belongs to the Special Issue Magnetic Materials and Applications)
We report results on the structural and microwave properties and magnetic phase transitions in polycrystalline Sr3Co2Fe24O41 hexaferrite synthesized by sol-gel auto-combustion and acting as a filler in a composite microwave absorbing material. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves revealed a change in the magnetization behavior at 293 K. The reflection losses in the 1–20 GHz range of the Sr3Co2Fe24O41 powder dispersed homogeneously in a polymer matrix of silicon rubber were investigated in both the absence and presence of a magnetic field. In the latter case, a dramatic rise in the attenuation was observed. The microwave reflection losses reached the maximum value of 32.63 dB at 17.29 GHz in the Ku-band. The sensitivity of the microwave properties of the composite material to the external magnetic field was manifested by the appearance of new reflection losses maxima. At a fixed thickness tm of the composite, the attenuation peak frequency can be adjusted to a certain value either by changing the filling density or by applying an external magnetic field. View Full-Text
Keywords: Z-type hexaferrite; magnetic phase transition; microwave properties; reflection losses Z-type hexaferrite; magnetic phase transition; microwave properties; reflection losses
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MDPI and ACS Style

Kolev, S.; Peneva, P.; Krezhov, K.; Malakova, T.; Ghelev, C.; Koutzarova, T.; Kovacheva, D.; Vertruyen, B.; Closset, R.; Maria Tran, L.; Zaleski, A. Structural, Magnetic and Microwave Characterization of Polycrystalline Z-Type Sr3Co2Fe24O41 Hexaferrite. Materials 2020, 13, 2355.

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