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[摘要]：High-quality orthorhombic (OT) TmMnO3 (TMO) thin films with a-axis perpendicular to the film surface are grown epitaxially on Nb-doped SrTiO3 (110) substrates using pulsed laser deposition. The structural, magnetic, and electric properties of OT-TMO films are measured. We found that a strong coupling between the magnetic structure and the electric polarization. Our experimental results also show that ferroelectricity in OT-TMO thin films below 32 K. Furthermore, the large electric polarization up to 0.45 mu C/cm(2) is observed at 10 K, supporting a theoretical prediction of large polarization in the E-type spin structure in this system. (C) 2010 American Institute of Physics. [doi:10.1063/1.3524500] |
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