Preparation and Characterization of EuO/BaO Bilayer Epitaxially Grown on SrTiO ₃ Substrate

We grew epitaxially single phase ferromagnetic EuO film on SrTiO3 substrate by inserting BaO buffer layer with an orientation of EuO [100]//lBaO[100]//SrTiO3 [110] and EuO(001)//BaO(001)//SrTiO3 (001). Compared with EuO film on MgO substrate, high quality of the film was obtained, demonstrated by appearance of Kikuchi line in RHEED pattern with less thickness, Laue oscillations around EuO(002) Bragg peak, lower full width of half maximum of rocking curve for EuO(002), and lower coercive field. The growth rate of EuO was between 8.0 x 10(-2) and 2.6 x 10(-1) K s(-1), depending on the growth condition. Saturation magnetic moment 6.84(+/-0.31)mu(B) was obtained per europium atom. The oxygen deficiency of EuO film was estimated as less than 0.03% from the temperature dependence of resistivity. The highest resistivity detected was 2.55 x 10(11) Omega.cm at 83.8 K.