Anisotropic electronic structure in single crystalline orthorhombic TbMnO_3 thin films

摘要

We have deposited the c-axis-oriented orthorhombic TbMnO_3 (o-TMO) films with well-aligned in-plane orientations on NdGaO_3 (001} substrates by using pulsed laser deposition. The distinctive orientation alignments between the film and substrate allow the study of the X-ray absorption spectroscopy (XAS) with the electric field along three major crystallographic directions, respectively. Polarization-dependent XAS spectra show significant anisotropy in the electronic structure of o-TMO. The correlation between the electronic structure, the bonding anisotropy, and the magnetoelectric effect in the multiferroic materials is revealed.