In this study, we aimed to investigate the magnetic properties of the Co/graphene/Pt(111). Firstly, we used the annealing technique to prepare graphene. The car- bon atoms were segregated from the bulk of the Pt(111) to form graphene eager on the surface. After the preparation of graphene, we confirmed its quality by using STM and LEED. Secondly, we deposited 3 to 25 ML (monolayer) Co on graphene/Pt(111) by electron beam evaporator at low temperature ( 200 K). Then, we measured the ferromagnetic properties of different thickness of Co on graphene / Pt(111) by XMCD, and studied the growth behavior of few monolayer Co on graphene by STM. By serial analysis no ferromagnetic property of few monolayer Co was detected on graphene / Pt(111) by X-ray absorption spectra. The STM image show that the few monolayer Co on graphene mucleates as clusters.

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