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Tuning the Magnetic Anisotropy at a Molecule-Metal Interface

Abstract : We demonstrate that a C 60 overlayer enhances the perpendicular magnetic anisotropy of a Co thin film, inducing an inverse spin reorientation transition from in plane to out of plane. The driving force is the C 60 =Co interfacial magnetic anisotropy that we have measured quantitatively in situ as a function of the C 60 coverage. Comparison with state-of-the-art ab initio calculations show that this interfacial anisotropy mainly arises from the local hybridization between C 60 p z and Co d z 2 orbitals. By generalizing these arguments, we also demonstrate that the hybridization of C 60 with a Fe(110) surface decreases the perpendicular magnetic anisotropy. These results open the way to tailor the interfacial magnetic anisotropy in organic-material–ferromagnet systems.
Keywords : 7320Hb 7570Cn 7820Ls 7530Gw
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K. Bairagi, A. Bellec, Vincent Repain, C. Chacon, Y. Girard, et al.. Tuning the Magnetic Anisotropy at a Molecule-Metal Interface. Physical Review Letters, American Physical Society, 2015, 114 (24), pp.247203. ⟨10.1103/PhysRevLett.114.247203⟩. ⟨cea-01366478⟩

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