Effects of Ga Substitution on Micromorphology and Static Magnetic Properties of Self-Biased M-Type Sr Hexaferrites

Abstract:

The Sr hexaferrites with chemical formula Sr_0.4La_0.3Ca_0.3Fe_11.85-xGa_xCo_0.15O₁₉ (x = 0.0 — 1.4) were manufactured by traditional ceramic method. The affect of Ga substitution on static magnetic properties and micromorphology of M-type Sr (SrM) hexaferrites have been presented in detail. In accordance with the experiment results, as Ga-substituted content x rises up from 0.0 to 1.4, all SrM hexaferrite samples are magnetoplumbite hexagonal structure. The difference between radius of Fe³⁺ and Ga³⁺ ions leads to the decrease of lattice constants. As the amount of Ga substitution x increases from 0.0 to 1.4, the 4πM_s and 4πM_r presents a trend of increasing, but the H_c shows the opposite trend. K₁ and H_a of all samples are higher than 2.5×10⁵ J/m³ and 21 kOe respectively, which manifests all samples possess the strong uniaxial anisotropy. The materials discussed in this paper possess huge potential in the application of high frequency self-biased microwave devices.

• Periodical: Materials Science Forum (Volume 1033)
• Pages: 121-125
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1033.121
• Online since: June 2021
• Authors: Yue Dai*, Zhong Wen Lan, Zhong Yu, Ke Sun
• Keywords: Anisotropy Constant, Anisotropy Field, Magnetic Properties, Micromorphology, SrM Hexaferrite

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