Hu, ZimengStenning, Gavin B. G.Koval, VladimirWu, JiyueYang, BinLeavesley, AlisaWylde, RichardReece, Michael J.Jia, ChenglongYan, Haixue2022-11-242022-11-242022-10-04Hu, Z., Stenning, G. B. G., Koval, V., Wu, J., Yang, B., Leavesley, A., Wylde, R., Reece, M. J., Jia, C., & Yan, H. (2022). Terahertz Faraday rotation of SrFe12O19 hexaferrites enhanced by Nb-doping. ACS Applied Materials and Interfaces, 14(41), 46738–46747. https://doi.org/10.1021/acsami.2c130881944-824410.1021/acsami.2c13088http://hdl.handle.net/10034/627325This document is the Accepted Manuscript version of a Published Work that appeared in final form in [ACS Applied Materials and Interfaces], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [https://pubs.acs.org/doi/full/10.1021/acsami.2c13088].The magneto-optical and dielectric behaviour of M-type hexaferrites as permanent magnets in the THz band are essential for potential applications like microwave absorbers and antennas, while are rarely reported recent years. In this work, single-phase SrFe12-xNbxO19 hexaferrite ceramics were prepared by conventional solid state sintering method. Temperature-dependent of dielectric parameters were investigated here to search the relationship between dielectric response and magnetic phase transition. The saturated magnetization increases by nearly 12% while the coercive field decreases by 30% in the x = 0.03 composition compared to that of the x = 0.00 sample. Besides, Nb substitution improves the magneto-optical behaviour in the THz band by comparing the Faraday rotation parameter from 0.75 (x = 0.00) to 1.30 (x = 0.03). The changes in the magnetic properties are explained by a composition-driven increase of the net magnetic moment and enhanced ferromagnetic exchange coupling. The substitution of donor dopant Nb on the Fe site is a feasible way to obtain multifunctional M-type hexaferrites, as preferred candidates for permanent magnets, sensors and other electronic devices.CC0 1.0 Universalhttps://creativecommons.org/licenses/by/4.0/SrFe12O19hexaferriteTHzFaraday rotationferrimagneticdielectricArticle1944-8252ACS Applied Materials and Interfaces