Abstract
The magnetic anisotropy of the Co thin films on Ru(0001) and the effect of the Ru capping were studied by Co LIII,II‐edge x‐ray magnetic circular dichroism (XMCD). As‐deposited Co films show only surface parallel magnetization in the whole thickness range of the observation (1–15 monolayer), while a Ru capping on 1–6 ML Co/Ru(0001) causes a spin reorientation transition (SRT) from surface parallel to the perpendicular magnetization. The critical thickness of SRT by the Ru capping is ∼6 ML. The Ru capping causes the reduction of the parallel orbital magnetic moments and contributes to stabilize perpendicular magnetic anisotropy.
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