Abstract
Atomic structure and magnetic anisotropy of Ru/Co/Ru(0001) were studied by $\text{Co}\text{ }K$-edge extended x-ray absorption fine structure and $\text{Co}\text{ }{L}_{\text{III},\text{II}}$-edge x-ray magnetic circular dichroism. The Co/Ru(0001) films exhibit in-plane magnetization in a thickness range of 1--15 ML. The Co film shows a large expansion of the in-plane Co-Co bond length at the initial stage of the growth, leading to a large strain. Upon Ru capping on the Co/Ru(0001) film, the strain is relaxed and a spin reorientation transition (SRT) occurs from in-plane to out-of-plane magnetization. These results contradict the conventional understanding of magnetic anisotropy in which perpendicular magnetic anisotropy (PMA) is believed to be enhanced by the strain in the film. The estimation of magnetic anisotropy constants revealed that the SRT is induced by a large PMA at the Co/Ru interface in the Ru capped films, as well as a large in-plane magnetic anisotropy at the vacuum/Co and/or Co/Ru interfaces in the Co bare films.
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