Terahertz Faraday rotation of SrFe12O19 hexaferrites enhanced by Nb-doping
Stenning, Gavin B. G.
Reece, Michael J.
AffiliationQueen Mary University of London; Rutherford Appleton Laboratory; Slovak Academy of Sciences; University of Chester; Virginia Diodes Inc; Thomas Keating Ltd; Lanzhou University
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AbstractThe 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.
CitationHu, 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.2c13088
PublisherAmerican Chemical Society
DescriptionThis 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].
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