Spin resonance in EuTiO3 probed by time-domain GHz ellipsometry
J.L.M. van Mechelen, D. van der Marel, I. Crassee, and T. Kolodiazhnyi
TL;DR
This paper demonstrates a magnetic spin resonance in EuTiO3 using a novel GHz time-domain ellipsometry technique, revealing a record high Faraday rotation and strong magnetic dipole absorption.
Contribution
It introduces a new magneto-optical measurement method and characterizes spin resonance and Faraday rotation in EuTiO3 at GHz frequencies.
Findings
Record high Faraday rotation of 590 deg/mm at 1.6 T
Observation of magnetic dipole transitions in EuTiO3
Strong dichroism caused by Zeeman split Eu2+ energy levels
Abstract
We show an example of a purely magnetic spin resonance in EuTiO3 and the resulting new record high Faraday rotation of 590 deg/mm at 1.6 T for 1 cm wavelengths probed by a novel technique of magneto-optical GHz time-domain ellipsometry. From our transmission measurements of linear polarized light we map out the complex index of refraction in the GHz to THz 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.
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