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Coherent Epitaxy and Magnetic Properties of Sr2FeMoO6 Thin Films on Ba0.4Sr0.6TiO3-Buffered SrTiO3 Substrates

Thin films of double perovskite Sr2FeMoO6 have been grown epitaxially on (001) SrTiO3 substrates with a buffer layer of Ba0.4Sr0.6TiO3, which has a nearly complete lattice matching to Sr2FeMoO6. Their structural and magnetic properties were investigated and compared with those of films grown directly on bare SrTiO3 substrates. It is shown by X-ray analysis that Ba0.4Sr0.6TiO3 buffer layers with an appropriate lattice parameter enable us to achieve coherent growth of Sr2FeMoO6 thin films, while bare SrTiO3 with a -1% lattice mismatch results in incoherent growth with partially relaxed strain. It is found that coherently grown Sr2FeMoO6 thin films exhibit a saturation magnetization value of 3.8 µB per formula unit (f.u.), which is comparable to the predicted values. The implication of this study is that coherent growth without strain relaxation is effective to obtain the full magnetization value in ordered double perovskite ferromagnetic thin films.