Energetics and the magnetic state of Mn2 adsorbed on Au(111): Dimer bond distance dependence
Author
dc.contributor.author
López Moreno, S.
Author
dc.contributor.author
Mejía López, J.
Author
dc.contributor.author
Muñoz Sáez, Francisco
Author
dc.contributor.author
Calles, A.
Author
dc.contributor.author
Morán López, J. L.
Admission date
dc.date.accessioned
2016-01-18T13:42:47Z
Available date
dc.date.available
2016-01-18T13:42:47Z
Publication date
dc.date.issued
2016
Cita de ítem
dc.identifier.citation
Journal of Magnetism and Magnetic Materials 403 (2016) 172–180
en_US
Identifier
dc.identifier.other
DOI: 10.1016/j.jmmm.2015.11.079
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/136559
General note
dc.description
Artículo de publicación ISI
en_US
Abstract
dc.description.abstract
In this work we present a theoretical study of the adsorption Mn-2 dimer on the Au(111) surface. Here we use the density functional theory to construct a map of adsorption energies, E-A, of Mn-2 on a Au(111) surface as a function of interatomic bond distance, d(mn-mn), among Mn atoms. We employed a 4 x 4 supercell of Au(111) surface which lead us to reach d(mn-mn) values in the range from 2.6 to 6.8 A. To make a full study of the adsorption energies we considered the antiferromagnetic (AFM) and ferromagnetic (FM) states of the Mn-2 on the surface. The energy landscape contains local minima when the Mn atoms are adsorbed above triangular sites and barriers that the Mn adatoms have to overcome when they move across the Au(111) surface along various paths. Our results show that the lowest energy state corresponds to the state in which the Mn atoms are next-nearest neighbors and are antiferromagnetically coupled. Furthermore, all the local minima with higher bonding energy are also those in the antiferromagnetic state. Nevertheless we find a short interval in which the FM state has lower energy than the AFM one. Finally, scanning tunneling microscope simulations for various dimer configurations on surface are reported.