Well-crystallized epitaxial YbFe2O4 films were prepared on an α-Al2O3(001) substrate using an Fe3O4 buffer layer. Fe3O4 has a relatively small lattice mismatch with both YbFe2O4 and α-Al2O3. Electron diffraction analysis combined with transmission electron microscopy revealed the epitaxial relationship to be α-Al2O3(001) ∥ Fe3O4(111) ∥ YbFe2O4(001). Moreover, superlattice spots due the Fe2+-Fe3+ charge order state of YbFe2O4 were clarified. The Fe2+/Fe3+ ratio in YbFe2O4 was nearly stoichiometric. The film exhibited a ferrimagnetic transition at ∼220 K and a nonlinear current-voltage characteristic at room temperature. These results confirmed the good crystallinity and stoichiometry of the obtained YbFe2O4 films.
ASJC Scopus subject areas
- Physics and Astronomy(all)