title: Spin resonance in EuTiO3 probed by time-domain gigahertz ellipsometry.
abstract: We show an example of a purely magnetic spin resonance in EuTiO(3) and the resulting new record high Faraday rotation of 590°/mm at 1.6 T for 1 cm wavelengths probed by a novel technique of magneto-optical gigahertz time-domain ellipsometry. From our transmission measurements of linear polarized light, we map out the complex index of refraction n=√ϵμ in the gigahertz to terahertz range. We observe a strong resonant absorption by magnetic dipole transitions involving the Zeeman split S=7/2 magnetic energy levels of the Eu(2+) ions, which causes a very large dichroism for circular polarized radiation.
authors.affiliation: Département de Physique de la Matière Condensée, Université de Genève, Genève, Switzerland.
authors.forename: J L M
authors.initials: JL
authors.lastname: van Mechelen
authors.forename: D
authors.initials: D
authors.lastname: van der Marel
authors.forename: I
authors.initials: I
authors.lastname: Crassee
authors.forename: T
authors.initials: T
authors.lastname: Kolodiazhnyi