Resolving the magnetic structure in the high temperature incommensurate phase of a coherently strained (010) oriented o-TbMnO3 thin films
We plan to determine the magnetic structure of the orthorhombic (o-) TbMnO3 thin film deposited on (010) oriented o-YAlO3 substrates in the high temperature incommensurate (HTI) phase by measuring 20-30 magnetic reflections at D10. Neutron diffraction on triple-axis spectrometer RITA-II at SINQ show an onset of HTI phase below TN ~ 41K (0, qk ~ 0.496, 1), which locks into a LTC phase below Tlock ~ 33 K (0, qk = 0.5, 1). In contrast to the bulk o-TbMnO3 [1], these films demonstrate a large polarisation (~0.4 μC cm-2) along the a-axis below TFE ~ 41 K, in the HTI phase. Concomitant onset of the ferroelectric phase and the HTI magnetic phase of the TbMnO3 makes this system highly interesting to study the magnetic structure in the HTI phase. This experiment will be a continuation to the previous experiment to study the low temperature commensurate (LTC) phase at D10. Resolving the magnetic structure in the HTI phase in these strained films unambiguously will provide unique understanding of the mechanism behind the enhancement of multiferroicity in TbMnO3. The sample to be measured is a 44 nm thin (010) oriented o-TbMnO3 film.
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MUKHERJEE Saumya; CHAPON Laurent; KENZELMANN Michel; NIEDERMAYER Christof; OULADDIAF Bachir and WHITE Jonathan. (2017). Resolving the magnetic structure in the high temperature incommensurate phase of a coherently strained (010) oriented o-TbMnO3 thin films. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-908
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