Publications by Harald Brune | EPFL Graph Search

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Confined single metal atoms in graphene-based materials have proven to be excellent catalysts for several reactions and promising gas sensing systems. However, whether the chemical activity arises from the specific type of metal atom or is a direct consequ ...

Many atomic diffusion processes occur at rates that are too fast to observe experimentally. Using video scanning tunnelling microscopy, researchers are now able to observe the individual steps involved in correlated transport of atomic strings on metal surfaces.

Ag aggregation on Ag(111), Pt(111), and 1 ML Ag pseudomorphically grown on Pt(111), has been studied with variable temperature STM. These systems all have in common that dendritic patterns with trigonal symmetry rather than randomly ramified aggregates, which would be expected for a simple hit and stick mechanism, form. Dendrites are characterized by preferential growth in the [2]-directions, i.e., perpendicular to A-steps. The key process for their formation has been found to be diffusion of

A surface magneto-optic Kerr effect (MOKE) setup fully integrated in an ultrahigh vacuum chamber is presented. The system has been designed to combine in situ MOKE and scanning tunneling microscopy. Magnetic fields up to 0.3 T can be applied at any angle i ...

We report a systematic study for metal-on-metal surface migration in the weak corrugation regime, i.e., with migration barriers falling below approximate to 100 meV. The migration characteristics are elucidated by variable-temperature scanning tunneling microscopy observations in the 50-200 K temperature range, which are analyzed by means of nucleation theory. The results demonstrate that, upon entering the weak corrugation regime, the dynamics of the systems are characterized by increasingly reduced effect

Submonolayer films of AE on Pt(111) exhibit parallel partial dislocations separated by narrow hcp domains and much wider fcc domains, the large difference in width being atypical of strained metal overlayers on close-packed substrates. Using a two-dimensional Frenkel-Kontorova model, we calculate the relative domain widths. We examine possible effects of dislocations on equilibrium island shape and calculate the energies of stable and metastable dislocation structures versus island size. Experimental result

We present spin-polarized scanning tunneling microscopy Measurements demonstrating spin-polarizations of tip to 80 % for Co islands on a Pt(111) surface and a tunnel magneto resistance of 850 similar to% between the islands and an anti-ferromagnetic Cr-co ...

We report on the self-assembly of Fe adatoms on a Cu(111) surface that is patterned by a metal-organic honeycomb network, formed by coordination of dicarbonitrile pentaphenyl molecules with Cu adatoms. Fe atoms landing on the metal surface are mobile and s ...

We have employed x-ray absorption spectroscopy and x-ray magnetic circular dichroism (XMCD) at the Ni andMn L-3,L-2 edges in LaMnO3/LaNiO3 superlattices grown along (001) and (111) orientations. Our results show a significant XMCD signal and thus the prese ...

The trigonal strain-relief pattern formed by an Ag bilayer on Pt(111) is a prominent example for dislocation networks and their use as nanotemplates. However, its atomic structure has not been solved. Combining scanning tunneling microscopy, low-energy ion ...

Ligand-protected Au clusters are non-bleaching fluorescence markers in bio- and medical applications. Here we show that their fluorescence can be an intrinsic property of the Au cluster itself. We find a very intense and sharp fluorescence peak located at ...

Individual Mn impurities deposited on Ge(100), Ge(111), and GaAs(110) substrates present magnetic moments significantly larger compared to the average Mn magnetization in bulklike Ga1-xMnxAs and MnxGe1-x dilute magnetic semiconductors. The Mn magnetic mome ...

Harald Brune

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CO Adsorption on a Single-Atom Catalyst Stably Embedded in Graphene

Surface diffusion - Shifting strings

Creating Metal Nanostructures at Metal Surfaces Using Growth Kinetics

Anisotropic corner diffusion as origin for dendritic growth on hexagonal substrates

High resolution in situ magneto-optic Kerr effect and scanning tunneling microscopy setup with all optical components in UHV

Dynamics of surface migration in the weak corrugation regime

Dislocation structures of submonolayer films near the commensurate-incommensurate phase transition: Ag on Pt(111)

Giant Spin-Polarization and Magnetic Anisotropy of Nanostructures at Surfaces

High magnetic moments and anisotropies for FexCo1 - x monolayers on Pt(111)

Formation of Fe Cluster Superlattice in a Metal-Organic Quantum-Box Network

Interfacial properties of LaMnO3/LaNiO3 superlattices grown along (001) and (111) orientations

Interface-confined mixing and buried partial dislocations for Ag bilayer on Pt(111)

Intense fluorescence of Au-20

Probing magnetism at the nanoscale

Paramagnetic Mn impurities on Ge and GaAs surfaces

Excited Spin-State Trapping in Spin Crossover Complexes on Ferroelectric Substrates

Assembly and probing of spin chains of finite size

Thermal and Magnetic-Field Stability of Holmium Single-Atom Magnets

Self-assembly of periodic bicomponent wires and ribbons

Conformational adaptation in supramolecular assembly on surfaces