Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 13: Magnetic Materials II
MA 13.5: Vortrag
Dienstag, 8. März 2016, 10:30–10:45, H31
Determining the Verdet constant in antiferromagnetic materials — •Christian Tzschaschel1, Stefan Günther1, Takuya Satoh2, and Manfred Fiebig1 — 1ETH Zürich, Switzerland — 2Kyushu University, Japan
Recently, in the context of all-optical switching and ultrafast magnon generation, the Faraday effect and its inverse were discussed as possible mechanisms allowing to probe and stimulate magnetic excitations. The strength of both processes is related to the Verdet constant - a material parameter describing light-matter interactions in magnetic fields.
By measuring the spectral dependence of the Faraday rotation under the application of magnetic fields up to 6 T at temperatures down to 4 K, we are able to investigate fully compensated antiferromagnets like NiO and determine the Verdet constant in a broad spectral range covering the visible and near infrared. Subsequently, we compare the results to Bismuth-doped Yttrium-Iron-garnet as a well-known example of a material exhibiting a finite spontaneous magnetization.
Our results can be used to maximize the magnon generation efficiency with circularly polarized light via the inverse Faraday effect and at the same time optimize the sensitivity for the detection of magnetic excitations.