Well-crystallized epitaxial YbFe 2 O 4 films were prepared on an α-Al 2 O 3 (001) substrate using an Fe 3 O 4 buffer layer. Fe 3 O 4 has a relatively small lattice mismatch with both YbFe 2 O 4 and α-Al 2 O 3 . Electron diffraction analysis combined with transmission electron microscopy revealed the epitaxial relationship to be α-Al 2 O 3 [110](001) k Fe 3 O 4 [ 211](111) k YbFe 2 O 4 [110](001). Moreover, superlattice spots due the Fe 2+ -Fe 3+ charge order state of YbFe 2 O 4 were clarified. The Fe 2+ /Fe 3+ ratio in YbFe 2 O 4 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 YbFe 2 O 4 films.
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