Terahertz-infrared spectroscopy of single crystalline m-type hexaferrite BaTix Fe12-xO19
Yegiyan, S. R., L. N. Alyabyeva, V. I. Torgashev, D. A. Vinnik, S. A. Gudkova, A. S. Prokhorov, M. Dressel, and B. P. Gorshunov. “Terahertz-infrared spectroscopy of single crystalline m-type hexaferrite BaTixFe12-xO19.” In Journal of Physics: Conference Series, vol. 1389, no. 1, p. 012038. IOP Publishing, 2019.
We have studied polarization-dependent broad-band dielectric response of singlecrystalline Ti-substituted barium hexaferrites BaTixFe12-xO19, x=0.64., 0.75, 1.1, in the frequency range from 10 to 8000 cm-1 and at temperatures from 5 to 300 K. In addition to a rich set of phonon resonances located at frequencies from 90 to 800 cm-1 we observed an unusual low-energy response (terahertz region, 10-100 cm-1 ) stemming from two different effects: relaxational process and second order spin-orbit coupling in Fe2+ ground state, that may set up new prospects for doped hexaferrites in terahertz technologies.