Dresden 2017 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 9: Poster Session
DF 9.33: Poster
Dienstag, 21. März 2017, 14:00–16:00, P1C
Directional dichroism via optical para-magnetoelectric effect in high magnetic fields — •David Szaller1, Daniel G. Farkas1, Vilmos Kocsis1,4, Sandor Bordacs1, Urmas Nagel2, Toomas Room2, Bence Bernath3, Hiroshi Murakawa4, and Istvan Kezsmarki1 — 1Dept. of Phys., Budapest Uni. of Tech. and MTA-BME Lendület Magn.-opt. Spect. Gr., Hungary — 2Nat. Inst. of Chem. Phys. and Biophys., Estonia — 3High Field Magnet Lab., Inst. for Molecules and Materials, The Netherlands — 4RIKEN Center for Emergent Matter Science, Japan
Magnetoelectric multiferroics, i.e. materials simultaneously hosting ferroelectric and magnetic order, attract enormous interest due to their potential in IT applications. The magnetoelectric coupling present in these materials appears in the optical regime as the difference of absorption coefficients of counter-propagating light beams, which effect is termed as directional dichroism. This exotic phenomenon has been reported for spin excitations in multiferroic melilite single crystals and proposed as a new principle of directional light switches operating in the GHz-THz region. Applications seem to be limited to low temperatures where electric and magnetic order coexist. However, recent studies on melilites revealed that an external magnetic field can recover the electric polarization via the para-magnetoelectric effect far above the material’s ordering temperature. Based on these static results we found strong directional dichroism in the paramagnetic phase of Sr2CoSi2O7. The strength of the effect grows with the magnetic field, in accordance with the magnetoelectric sum rule.