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Magnetism of Mn single atom and dimer on Co(0001) hcp surface is studied on the basis of density functional theory using Quantum Espresso code. The most stable geometry takes place when Mn is adsorbed in the most highly coordinated sites. Mn single atom couples ferromagnetically to the Co atoms and shows a high magnetic moment of 4.53μB. Mn dimer also couples ferromagnetically to the Co atoms, shows...