Structure and Magnetic Properties of Fe/$X$ ($X=\text{Au}$, Ag, Cu) Epitaxial Multilayer Films Grown on MgO(011) Substrates

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Fe/$X$ ($X=\text{Au}$, Ag, Cu) epitaxial multilayer films were prepared on MgO(011) substrates by alternate deposition of Fe and $X$ atomic layers, varying the composition of Fe/$X$ from the ratio around $L1_{0}$ phase stoichiometry ($\text{Fe}:X=50:50$) to $X$-rich region. The effects of $X$ atom on the formation of $L1_{0}$ ordered phase were investigated. FeAu(011)L1_{0} films with the easy magnetization direction canted from the perpendicular direction to the film plane were obtained on the MgO(011) substrates. The lattice constants of the $L1_{0}$ ordered FeAu alloy were estimated to be $a=0.407\pm 0.012$ nm and $c=0.388\pm 0.011$ nm, respectively. A stronger X-ray diffraction intensity of $L1_{0}$ phase is observed in an Au-rich compositional region. No evidence of $L1_{0}$ ordered phase formation is recognized for the Fe/Ag and the Fe/Cu systems.
2007-10-25