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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.66: Poster
Thursday, March 15, 2018, 15:00–18:00, Poster C
Electric field control of chiral correlations above the multiferroic phase transition in Ni3V2O8 — •Sebastian Biesenkamp1, Jonas Stein1, Karin Schmalzl2, Navid Qureshi3, and Markus Braden1 — 1Institute of Physics II, University of Cologne, Germany — 2JCNS at ILL, Grenoble, France — 3ILL, Grenoble, France
Multiferroics allow one to control chiral magnetic order by an electric field. While this effect is well established in the long-range multiferroic phase, only recently it was observed that in TbMnO3 and in MnWO4 chiral correlations can be controlled even above the onset of long-range multiferroic order [1]. Here we report polarized neutron scattering experiments on Ni3V2O8 that reveal the qualitatively same behavior in a region above the transition to the multiferroic phase. Time-resolved neutron scattering experiments have been executed in order to resolve the relaxation time τ of chiral domains in Ni3V2O8 for different temperatures, while switching them with external fields of about 1kV/mm. With our time-resolved setup, it was possible to follow the relaxation of chiral domains over 5 orders of magnitude in time, yielding a simple activation law τ∝ exp(EA/kBT).
Stein et al. Phys. Rev. Lett. 119, 177201 (2017)