title: The effect of a Pt impurity layer on the magnetocrystalline anisotropy of hexagonal close-packed Co: a first-principles study.
abstract: On the  basis of the fully relativistic screened Korringa-Kohn-Rostoker  method we investigate the variation in the magnetocrystalline anisotropy energy (MAE) of hexagonal close-packed cobalt with the addition of platinum impurities. In particular, we perform calculations on a bulk cobalt system in which one of the atomic layers contains a fractional, substitutional platinum impurity. Our calculations show that at small concentrations of platinum the MAE is reduced, while at larger concentrations the MAE is enhanced. This change in the MAE can be attributed to an interplay between on-site Pt MAE contributions and induced MAE contributions on the Co sites. The latter are subject to pronounced, long-ranged Friedel oscillations that can lead to significant size effects in the experimental determination of the MAE of nanosized samples.
authors.affiliation: Department of Physics, University of York, York YO10 5DD, UK. cja505@york.ac.uk
authors.forename: C J
authors.initials: CJ
authors.lastname: Aas
authors.forename: K
authors.initials: K
authors.lastname: Palotás
authors.forename: L
authors.initials: L
authors.lastname: Szunyogh
authors.forename: R W
authors.initials: RW
authors.lastname: Chantrell
mesh_terms: D000327:Adsorption; D016880:Anisotropy; D003035:Cobalt / Q000737:chemistry*; D003198:Computer Simulation; D060526:Magnetic Fields; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D010984:Platinum / Q000737:chemistry*
chemical_list: D003035:Cobalt; D010984:Platinum