TY  - SER
AU  - Sarasola,Ane
AU  - Nistor,Corneliu
AU  - Persichetti,Luca
AU  - Stamm,Christian
AU  - Piamonteze,Cinthia
AU  - Gambardella,Pietro
AU  - Stepanow,Sebastian
AU  - Otrokov,Mikhail M.
AU  - Golovach,Vitaly N.
AU  - Blanco-Rey,Maria
AU  - Arnau,Andrés
TI  - Magnetic properties of metal-organic coordination networks based on 3d transition metal atoms
KW  - магнетизм
KW  - металлоорганическая сеть
KW  - рентгеновский магнитный круговой дихроизм
KW  - плотность
KW  - переходные металлы
KW  - статьи в журналах
N1  - Библиогр.: 40 назв
N2  - The magnetic anisotropy and exchange coupling between spins localized at the positions of 3d transition metal atoms forming two-dimensional metal-organic coordination networks (MOCNs) grown on the Au(111) metal surface are studied. In particular, we consider MOCNs made of Ni or Mn metal centers linked by TCNQ (7,7,8,8-tetracyanoquinodimethane) organic ligands, which form rectangular networks with 1:1 stoichiometry. Based on the analysis of X-ray magnetic circular dichroism (XMCD) data taken at T= 2.5 K, we find that Ni atoms in the Ni-TCNQ MOCNs are coupled ferromagnetically and do not show any significant magnetic anisotropy, while Mn atoms in the Mn-TCNQ MOCNs are coupled antiferromagnetically and do show a weak magnetic anisotropy with in-planemagnetization. We explain these observations using both amodelHamiltonian based on mean-fieldWeiss theory and density functional theory calculations that include spin-orbit coupling. Our main conclusion is that the antiferromagnetic coupling between Mn spins and the in-plane magnetization of the Mn spins can be explained neglecting effects due to the presence of the Au(111) surface, while for Ni-TCNQ the metal surface plays a role in determining the absence of magnetic anisotropy in the system
UR  - http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000789470
ER  -