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Structural and magnetic properties of atomic magnetic chains supported on Cu2N/Cu (100)

AuthorsRobles, Roberto ; Choi, Deung-Jang; Rubio-Verdú, Carmen; Gauyacq, J. P.; Ternes, Markus; Pascual, José I.; Loth, Sebastian; Lorente, Nicolás
Issue Date2017
Citation1st Workshop Spain-Taiwan: "2D Materials and Interfaces for Spintronics" (2017)
AbstractAtomic magnetic chains built by atomic manipulation on a Cu2N/Cu(111) surface are studied by combining scanning tunneling microscopy (STM) and density functional theory (DFT) calculations complemented by model Hamiltonian studies. For homogeneous Mn chains an unexpected electronic edge state is identified. This Tamm-like state is localized in the terminal Mn atoms and spin polarized. For heterogeneous FeMnx (x=1,6) chains the evolution of the geometrical, electronic and magnetic properties is studied as a function of the chain size. DFT results are fitted to a Heisenberg Hamiltonian from which exchange-coupling constants J are fitted for different chains. In the case of shorter chains spin-orbit coupling is included in the calculations and the results are fitted to an anisotropic spin Hamiltonian. The extracted parameters together with the values for J allows the computation of magnetic excitation energies and the comparison with the experimental data. Finally, for heterogeneous chains there is an emergent Kondo resonance spatially distributed along the chain and which strength can be controlled by changing the composition and spatial distribution of the chains. It is shown that the Kondo screening of the full chain by the electrons of the substrate depends on the interatomic entanglement of the spins in the chains, which paves the way for building and probing strongly correlated nanostructures.
DescriptionResumen del trabajo presentado al 1st Workshop Spain-Taiwan: "2D Materials and Interfaces for Spintronics", celebrado en Barcelona (España) del 23 al 25 de octubre de 2017.-- et al.
Appears in Collections:(CFM) Comunicaciones congresos
(CIN2) Comunicaciones congresos
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