Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)

O 41.70: Poster

Dienstag, 23. März 2010, 18:30–21:00, Poster B1

Exploiting the quantum confinement of electrons for studying and engineering of magnetic properties of nanostructures at surfaces: an ab Initio study — •Oleg O. Brovko and Valeri S. Stepanyuk — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

In the presented contribution we demonstrate, that the quantum confinement of electrons might just prove to be a universal tool for both studying and engineering magnetic properties of surface-bound nanostructures.

We demonstrate that it is possible to resolve magnetic properties and coupling of small clusters buried up to 1.5 nm deep beneath a metallic surface by studying the electrons confined between the nanostructure and the vacuum barrier [1]. We also demonstrate, that the exchange coupling of adatoms and addimers adsorbed at the surface to buried magnetic structures is strongly dependent on the local confinement of electrons in the host metal and can be manipulated by a deliberate variation of the nanostructure’s burying depth [2]. Finally we point out the possibility to utilize the quantum confinement of electrons on nanoscale islands in order to tune the coupling of single spins [3].

[1] O. O. Brovko, V. S. Stepanyuk, W. Hergert, and P. Bruno, Phys. Rev. B 79, 245417 (2009).

[2] O. O. Brovko, P. A. Ignatiev, V. S. Stepanyuk and P. Bruno, Phys. Rev. Lett. 101, 036809 (2008).

[3] O. O. Brovko, W. Hergert, and V. S. Stepanyuk, Phys. Rev. B 79, 205426 (2009).