Abstract
This article discusses the influence of substitution with Al3+ ions on the field of the effective magnetic anisotropy HAeff and the degree of magnetic texture f of anisotropic polycrystalline hexagonal ferrites of barium and strontium. Sample batches are produced by ceramic technology, the texture is formed by compaction in a magnetic field. The preparation of test objects is described in detail. Batches of barium hexaferrites with an ion concentration of Al3+ 0.9, 1.4, 2.5, and 2.6 f.u. and batches of strontium hexaferrites with a concentration of 0.1 f.u. are synthesized. It is demonstrated that the applied procedure makes it possible to obtain barium and strontium hexaferrites with HAeff = 19–35 kE and f = 80–83%. The mentioned values of HAeff and f are sufficient for the production of substrates for microstrip UHV devices of the millimeter wave band. For the first time, it is detected that the degree of the magnetic texture of polycrystalline barium hexaferrites increases with the concentration of Al3+ ions; in addition, a moderate magnetic texture (5.5–5.8%) is observed in isotropic strontium hexaferrites. The experimental results are discussed. The formation mechanism of the magnetic texture in the considered hexaferrites during synthesis is proposed.
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This work was supported by the Ministry of Education and Science of the Russian Federation, agreement no. 14.575.21.0030 dated June 27, 2014 (RFMEFI57514X0030).
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Shcherbakov, S.V., Nalogin, A.G., Kostishin, V.G. et al. The Influence of Substitution with Aluminum on the Field of Effective Magnetic Anisotropy and the Degree of Magnetic Texture of Anisotropic Polycrystalline Hexagonal Ferrites of Barium and Strontium for Substrates of Microstrip Devices of Microwave Electronics. Russ Microelectron 48, 582–588 (2019). https://doi.org/10.1134/S1063739719080110
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DOI: https://doi.org/10.1134/S1063739719080110