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ISSN:2321-6212

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Synthesis and microwave characteristic of Y and Z type hexaferrite


3rd International Conference on Magnetism and Magnetic Materials

October 22-23, 2018 | Rome, Italy

Tatyana Koutzarova, Svetoslav Kolev, Borislava Georgieva, Kiril Krezhov, Daniela Kovacheva, Chavdar Ghelev, B. Vertruyen, R Closset, Lan Maria Tran and Andrej Zaleski

Institute of Electronics, Bulgarian Academy of Sciences, Bulgaria Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Bulgaria University of Liege, Liege, Belgium Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Poland

Posters & Accepted Abstracts: Res. Rev. J Mat. Sci

DOI: 10.4172/2321-6212-C6-030

Abstract

We report studies on the structural, magnetic and microwave properties and magnetic phase transitions of polycrystalline Z-type Sr3Co2Fe24O41 and Y-type hexaferrite Ba0.5Sr1.5Zn2Al0.08Fe11.92O22 synthesized by sol-gel auto-combustion. The results of the ZFC and FC magnetization measurements of polycrystalline Z-type Sr3Co2Fe24O41 show a change in the magnetization behavior at 295 K, related to the magnetic phase transition from ferrimagnetic to transverse conical spin order. Therefore, the magneto-electric effect can be observed below 295K. The Ba0.5Sr1.5Zn2Al0.08Fe11.92O22 sample shows a triple loop at room temperature, due to the presence of two kinds of ferrimagnetic states. The magnetization at 50 kOe was 47 emu/g. We observed several magnetic phase transitions in the temperature ranging from 4.2 to 300 K for the Ba0.5Sr1.5Zn2Al0.08Fe11.92O22 sample. The magnetic phase transition from collinear ferromagnetic to proper-screw spin allows us to assume that Ba0.5Sr1.5Zn2Al0.08Fe11.92O22 is a multiferroic below 285 K. The microwave properties of both the Z-type and Y-type hexaferrites were studied between 1-20 GHz. A polycrystalline sample of hexaferrite was dispersed in a polymer matrix. The reflection losses of the composite samples were measured in an external magnetic field. A dramatic increase of the attenuation was observed due to the magnetic field influence on the composite samples with Z-type powder as a filler.

Biography

E-mail:

tatyana_koutzarova@yahoo com