Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Surface and Interface Magnetism I (O jointly with MA)
O 51.4: Vortrag
Mittwoch, 2. April 2014, 11:15–11:30, WIL C107
Exchange coupling and Magnetic anisotropies in 3d atomic chains adsorbed on Cu3N−Cu(110) molecular network — •Dmitry I. Bazhanov1,2, Oleg V. Stepanyuk1,2, and Valeri S. Stepanyuk2 — 1Faculty of Physics, Moscow State University, GSP-1, Lenin Hills, 119991 Moscow, Russia — 2Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
Based on first-principles calculations we study the magnetic states and exchange coupling in transition metal Mn, Fe, Co atomic chains deposited on a self-corrugated Cu3N−Cu(110) molecular network. The various adsorption sites on a bumping area of Cu3N layer are investigated where the atomic chains grow at the initial stage of nanowires growth [1]. We demonstrate, that the exchange coupling, magnetic order and anisotropies in atomic chains depend sensitively on their chemical composition and adsorption sites on Cu3N network. We find that the exchange interactions in atomic chains could lead to ferromagnetic or antiferromagnetic coupling depending on the position of the chain on the surface. The dynamics of classical spins is investigated by means of kinetic Monte Carlo method based on transition-state theory. Also using an ab initio determined exchange parameters and spin moments we evaluate the Heisenberg-Dirac-Van Vleck quantum spin Hamiltonian for calculations of the magnetic susceptibility, which is used for indicating the existence of quantum entanglement in the antiferromagnetic atomic chains.
This work was supported by the RFBR grant N13-02-01322.
[1] X.-D. Ma et al. , Phys. Rev. Lett. 102, 205503 (2009)