Spin and orbital configuration of metal phthalocyanine chains assembled on the Au(110) surface
The spin and orbital configuration of magnetic metal phthalocyanines (MPcs) deposited on metallic substrates are strongly influenced by the rehybridization of the molecular states with the underlying metal. FePc, CoPc, and CuPc isolated molecules are archetypal systems to investigate the interrelationship between magnetic moments and orbital symmetry after deposition on a metallic substrate. MPcs form long-range ordered chains self-assembled along the reconstructed channels of the Au(110) surface. X-ray magnetic circular dichroism from the L2,3 absorption edges of Fe, Co, and Cu shows that the orbital and spin configuration are strongly modified upon adsorption on the Au(110) surface if the orbitals responsible of the magnetic moment are involved in the interaction process. The magnetic moment for a single layer of molecular chains is completely quenched for the CoPc molecules, fully preserved for the CuPc and reduced for the FePc ones. The modified magnetic configuration is confined to the very interface layer, i.e., to the MPc molecules bound to the metal substrate up to the compact packing of the single layer. The different response can be rationalized in terms of the symmetry/orientation of the metal-ion d states interacting with the substrate states, as indicated by density functional theory calculations in agreement with experimental findings.
2013
2016-10-10 14:26:40
1033
phthalocyanine, Au(110), gold, self-assembly, pattern, configuration, density functional theory, DFT, CuPc, FePc
r6
Gargiani
Pierluigi
70
Giorgio
Rossi
70
Roberto
Biagi
70
Valdis
Corradini
70
Maddalena
Pedio
70
Sara
Fortuna
70
Arrigo
Calzolari
70
Stefano
Fabris
70
Julio Criginski
Cezar
70
N. B.
Brookes
70
Maria Grazia
Betti
70
COBISS_ID
3
4540923
DOI
15
10.1103/PhysRevB.87.165407
NUK URN
18
URN:SI:UNG:REP:S5XJV6KE
09_Gargiani_spin.pdf
1818533
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