Structural and magnetic properties of FeMnₓ chains (x=1-6) supported on Cu₂ N/Cu (100)
Choi, Deung-Jang (CIC Nano GUNE (Sant Sebastià, País Basc))
Robles, Roberto (Institut Català de Nanociència i Nanotecnologia)
Gauyacq, Jean-Pierre (Université Paris-Saclay. Institut des Sciences Moléculaires d'Orsay)
Ternes, Markus (Max Planck Institute for Solid State Research)
Loth, Sebastian (Max Planck Institute for the Structure and Dynamics of Matter)
Lorente, Nicolás. (Donostia International Physics Center)

Data:	2016
Resum:	Heterogeneous atomic magnetic chains are built by atom manipulation on a Cu₂N/Cu (100) substrate. Their magnetic properties are studied and rationalized by a combined scanning tunneling microscopy (STM) and density functional theory (DFT) work completed by model Hamiltonian studies. The chains are built using Fe and Mn atoms ontop of the Cu atoms along the N rows of the Cu₂N surface. Here, we present results for FeMnₓ chains (x=1-6) emphasizing the evolution of the geometrical, electronic, and magnetic properties with chain size. By fitting our results to a Heisenberg Hamiltonian we have studied the exchange-coupling matrix elements J for different chains. For the shorter chains, x≤2, we have included spin-orbit effects in the DFT calculations, extracting the magnetic anisotropy energy. Our results are also fitted to a simple anisotropic spin Hamiltonian and we have extracted values for the longitudinal-anisotropy D and transversal-anisotropy E constants. These parameters together with the values for J allow us to compute the magnetic excitation energies of the system and to compare them with the experimental data.
Ajuts:	European Commission 654469 Ministerio de Economía y Competitividad MAT2015-66888-C3-2-R Ministerio de Economía y Competitividad SEV-2013-0295
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	Physical review B, Vol. 94, Issue 8 (August 2016) , art. 85406, ISSN 2469-9969

DOI: 10.1103/PhysRevB.94.085406

Post-print 10 p, 1.6 MB

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