Magnetic Moment and Anisotropy of Individual Co Atoms on Graphene

We report on the magnetic properties of single Co atoms on graphene on Pt(111). By means of scanning tunneling microscopy spin-excitation spectroscopy, we infer a magnetic anisotropy of K = -8.1 meV with out-of-plane hard axis and a magnetic moment of 2.2 mu(B). Co adsorbs on the sixfold graphene hollow site. Upon hydrogen adsorption, three differently hydrogenated species are identified. Their magnetic properties are very different from those of clean Co. Ab initio calculations support our results and reveal that the large magnetic anisotropy stems from strong ligand field effects due to the interaction between Co and graphene orbitals.


Published in:
Physical Review Letters, 111, 23
Year:
2013
Publisher:
College Pk, American Physical Society
ISSN:
0031-9007
Laboratories:




 Record created 2014-01-20, last modified 2018-01-28

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