Single Domain Growth And Charge Ordering Of Epitaxial Ybfe2o4 Films
CRYSTENGCOMM(2021)
摘要
YbFe2 O4 is a charge-ordered ferroelectric that exhibits coupling between magnetization and electric polarization near room temperature and crystallizes in a rhombohedral structure (R3m). This study presents an attempt to fabricate stoichiometric and epitaxial YbFe2 O4-delta films with a nearly single-domain structure using an RF magnetron sputtering method. The (0001)-oriented epitaxial films of YbFe2 O4-delta on YSZ (111) substrates via reactive sputtering method exhibited clear three-fold symmetry normal to the substrate without the formation of twin domains rotated by 60 degrees. The oxygen stoichiometry of the epitaxial YbFe2 O4-delta was improved by controlling an oxygen partial pressure (PO2 ) during the deposition. The films showed a sharp ferrimagnetic transition, and the transition temperature (TN ) increased linearly to approximately 245 K with decreasing PO2 . The magnitude of magnetization of the obtained films was comparable to that of bulk single crystals. Further, the electron diffraction pattern of the stoichiometric films confirmed the presence of three-dimensional charge order, which is consistent with the behavior of the bulk crystals as well.
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