Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 75: Multiferroics II (jointly with DF, DS, KR, MA)
TT 75.9: Vortrag
Mittwoch, 18. März 2015, 17:35–17:50, EB 107
Multiferroicity in DyMnO3 thin films — •Chengliang Lu1,2, Hakan Deniz2, and Jun-Ming Liu3 — 1School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China — 2Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle(Saale), Germany — 3Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
The mutual control of ferroelectricity and magnetism is stepping towards practical applications proposed for quite a few promising devices in which multiferroic thin films are involved. Although ferroelectricity stemming from specific spiral spin ordering has been reported in highly distorted bulk perovskite manganites, the existence of magnetically induced ferroelectricity in the corresponding thin films remains an unresolved issue, which unfortunately halts this step. Here we report magnetically induced electric polarization and its gigantic response to magnetic field (an enhancement of 800% upon a field of 2 Tesla at 2 K) in DyMnO3 thin films grown on Nb-SrTiO3 substrates. Interestingly, we found a consecutive control of the polarization under a rotating magnetic field by detailed multiferroic response measurements. This is distinct to the standard polarization-flop process which results in a sudden change in polarization in multiferroics with spiral-spin-ordering state. The cooperative action of dual multiferroic mechanisms (the inverse Dzyaloshinskii-Moriya interaction among Mn moments and the exchange striction working between Dy and Mn moments) and phase coexistence associated with a twin-like structure was proposed as the origin of this phenomenon.