I.Carlomagno, A.M.Scaparro, L.Carlini, J.Drnec, G.Vinai, P.Torelli, R.Felici, S.Mobilio, C.Meneghini
Appl. Surf. Sci., 535, 146365 (2021), https://doi.org/10.1016/j.apsusc.2020.146365
Publication year: 2021

The local atomic structure and the magnetic response of Co films intercalated between Graphene and Ir(111) were investigated combining polarized X-ray Absorption Spectroscopy at the Co K edge with Magneto-Optic Kerr Effect. The structural and magnetic evolution upon a 500 C annealing was evaluated as a function of the film thickness. After the thermal treatment, our thick film (10 monolayers) presented a lower perpendicular magnetic anisotropy (PMA) as well as a reduced average structural disorder. On the other hand, in our thin film (5 monolayers), the annealing enhanced the perpendicular magnetic response and induced a local anisotropy by stretching the Co-Co bonds in the film plane and compressing those outside the plane. Our finding emphasizes the close relationship between the local structure of Co within the film and its magnetic properties.

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