Effects of Bi2O3 on FMR linewidth and microwave dielectric properties of LiZnMn ferrite

• Published in: Journal of alloys and compounds 2014-03, Vol.589, p.1-4
• Main Authors: Guo, Rongdi, Yu, Zhong, Yang, Yan, Jiang, Xiaona, Sun, Ke, Wu, Chuanjian, Xu, Zhiyong, Lan, Zhongwen
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Crystalline anisotropy; Dielectric properties of solids and liquids; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance; FMR linewidth; LiZnMn ferrite; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Microwave dielectric permittivity; Physics
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2013.11.148

•The first order crystalline constants were calculated for LiZnMn ferrite.•The FMR linewidth had been separated based on spin-wave approach at X-band.•The mechanism of dielectric polarization and dielectric loss were studied at X-band. Effects of Bi2O3 on ferromagnetic resonance (FMR) linewidth and microwave dielectric properties for LiZnMn ferrite prepared by a conventional ceramic method were investigated. The FMR linewidth had been separated to anisotropy and porosity line broadening contributions by an approximate calculation based on spin-wave approach. The results manifest that, Bi2O3 content significantly affects FMR linewidth via promoting grain growth and densification. With Bi2O3 concentration increasing, anisotropy contribution is changeless with a constant about 80Oe. The variation of the porosity line broadening contribution, however, is unanimous with the FMR linewidth. Meanwhile, the mechanism of dielectric polarization and dielectric loss of the samples were discussed. When the amount of Bi2O3 is 1.00wt%, the sample shows low FMR linewidth (ΔH, 133Oe) and low dielectric loss tangent (tan δε, 5×10−4) at 9.2GHz, high saturation magnetization (Ms, 415kA/m), and high squareness ratio (Br/Bs, 0.87).