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Co epitaxial thin films were prepared on MgO substrates of (100), (110), and (111) planes by molecular beam epitaxy. The growth process, the film structure, and the magnetic properties were investigated. The nucleation of Co crystal on MgO substrate varies depending on the substrate orientation and the substrate temperature. On MgO(100) substrate, Co(112 _ 0) epitaxial bi-crystalline films with hcp structure are obtained at temperatures higher than 300 °C, whereas a Co epitaxial film prepared at 100 °C includes fcc(100) crystal in addition to hcp(112 _ 0) crystal. Co(110) single-crystal films with fcc structure are formed on MgO(110) substrates. Co films consisting of fcc(111) and hcp(0001) crystals epitaxially grow on MgO(111) substrates. With increasing the substrate temperature, the volume ratio of hcp(0001) crystal increases, whereas that of fcc(111) crystal decreases. High-resolution transmission electron microscopy shows that atomically sharp boundaries are formed between the Co films and the MgO substrates, where misfit dislocations are preferentially introduced in the films at the interfaces. The presence of such dislocations relieves the strains caused by the lattice mismatches between the films and the substrates. The in-plane magnetization properties reflect the magnetocrystalline anisotropy of bulk hcp–Co or fcc–Co crystal.

Epitaxial Growth of Co Thin Films on MgO Single-Crystal Substrates