Back to Search Start Over

Crystallographically Textured and Magnetic LaCu-Substituted Ba-Hexaferrite with Excellent Gyromagnetic Properties

Crystallographically Textured and Magnetic LaCu-Substituted Ba-Hexaferrite with Excellent Gyromagnetic Properties

Authors :
Zan Jiao
Yuantao Wang
Meng Wei
Qifan Li
Ziyu Li
Alexander S. Sokolov
Chengju Yu
Xiaona Jiang
Chuanjian Wu
Zhongwen Lan
Ke Sun
Zhong Yu
Vincent G. Harris
Source :
Materials; Volume 15; Issue 24; Pages: 8792
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

Excellent gyromagnetic properties of textured, bulk Ba-hexaferrite samples are required for low-loss, self-biased applications for microwave and millimeter-wave (MMW) devices. However, conventionally processed bulk Ba-hexaferrite ceramics typically demonstrate low remanent magnetization values, 4πMr, of 2.0~3.0 kG, and relatively large ferromagnetic resonance (FMR) linewidths, ΔHFMR, of 0.8~2 kOe. These properties lead to the development of high-performance, practical devices. Herein, crystallographically textured Ba-hexaferrite samples, of the composition Ba0.8La0.2Fe11.8Cu0.2O19, having excellent functional properties, are proposed. These materials exhibit strong anisotropy fields, Ha, of ~14.6 kOe, high remanent magnetization, 4πMr, of 3.96 kGs, and a low ΔHFMR of 401 Oe at zero-bias field at the Q-band. Concomitantly, the broadband millimeter-wave transmittance was utilized to determine the complex permeability, μ*, and permittivity, ε*, of textured hexaferrites. Based on Schlöemann’s theory of complex permeability, μ*, the remanent magnetization, 4πMr, anisotropy field, Ha, and effective linewidth, ΔHeff, were estimated; these values agree well with measured values.

Details

ISSN :
19961944
Volume :
15
Database :
OpenAIRE
Journal :
Materials
Accession number :
edsair.doi.dedup.....85e82fd90d2acf01979e8dc9c349ba85
Full Text :
https://doi.org/10.3390/ma15248792