Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 44: Surface Magnetism (Joint Session with O) - Adatoms on surfaces

MA 44.2: Talk

Thursday, March 19, 2015, 15:15–15:30, H 0110

Impact of spin-fluctuations on the magnetic properties of 4d adatoms on metal substrates — •julen ibañez-azpiroz, manuel dos santos dias, stefan blügel, and samir lounis — Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

We present a theoretical analysis of the effect of spin-fluctuations on the magnetic properties of 4d adatoms deposited on metallic substrates. These systems have been long predicted to develop a large local magnetic moment by theoretical calculations based on density functional theory (DFT) [1], but experiments have measured negligible magnetic signals so far (see e.g. [2]). Our aim is to clarify the role of the spin-fluctuations, which tend to destabilize the magnetic moment and are not included into the standard DFT. We make use of the fluctuation-dissipation theorem, which relates the magnitude of the spin-fluctuations to the interacting spin-susceptibility as calculated in linear response theory. We access the latter quantity using a fully ab-initio approach based on the Korringa Kohn Rostoker (KKR) Green function formalism within time-dependent DFT [3,4].

We would like to acknowledge support from the Helmholtz Gemeinschaft Deutscher-Young Investigators Group Program No. VH-NG- 717 (Functional Nanoscale Structure and Probe Simulation Laboratory).

[1] K.Wildberger etal., Physical Review Letters, 75 509 (1995)

[2] J. Honolka etal., Physical Review B, 76 144412 (2007)

[3] S. Lounis etal., Physical Review B, 83 035109 (2011)

[4] S. Lounis etal., Physical Review Letters, 105 187205 (2010)