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Harald Brune

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Publications associées (117)

Giant Spin-Polarization and Magnetic Anisotropy of Nanostructures at Surfaces

Harald Brune

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 ...

Springer2009

Self-Assembly of Nanoporous Chiral Networks with Varying Symmetry from Sexiphenyl-dicarbonitrile on Ag(111)

Harald Brune, Régis Decker, Uta Schlickum

The self-assembly of sexiphenyl-dicarbonitrile molecules on the Ag(111) surface is investigated using low-temperature scanning tunneling microscopy (STM) in ultrahigh vacuum. Several nanoporous networks with varying symmetry and pore size coexist on the su ...

American Chemical Society2009

Magnetism of individual atoms adsorbed on surfaces

Harald Brune, Pietro Gambardella

Magnetic impurities in solids cause manifold changes in their macroscopic properties, such as anomalous low temperature resistance due to Kondo screening, reduction of the superconducting transition temperature due to local suppression of the order paramet ...

Elsevier2009

Stabilization of bimolecular islands on ultrathin NaCl films by a vicinal substrate

Harald Brune, Marta Canas Ventura

The structure of ultrathin NaCl films on Au(1 1 1) and on Au(11 12 12), as well as the one of bimolecular 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) and 1,4-bis-(2,4-diamino-1,3,5,-triazine)-benzene (BDATB) islands on NaCl films on both surfaces have ...

Elsevier2009

High-Quality 2D Metal−Organic Coordination Network Providing Giant Cavities within Mesoscale Domains

Harald Brune, Régis Decker, Uta Schlickum

A surface-supported open metal−organic nanomesh featuring a 24 nm2 cavity size and extending to μm domains was fabricated by Co-directed assembly of para-hexaphenyl-dicarbonitrile linker molecules in two dimensions. The metallosupramolecular lattice is the ...

American Chemical Society2009

Thermal dynamics at surfaces

Harald Brune

The present paper describes what happens at the surface of a crystal as its temperature steadily increases from zero Kelvin close to the bulk melting temperature. We treat thermal motion, such as the diffusion of individual adatoms establishing mass transp ...

Wiley-Blackwell2009

Supramolecular control of the magnetic anisotropy in two-dimensional high-spin Fe arrays at a metal interface

Harald Brune, Klaus Kern, Pietro Gambardella, Sylvain Clair, Alexandre Dmitriev, Sebastian Stepanow, Magalí Alejandra Lingenfelder

Magnetic atoms at surfaces are a rich model system for solid-state magnetic bits exhibiting either classical(1,2) or quantum(3,4) behaviour. Individual atoms, however, are difficult to arrange in regular patterns(1-5). Moreover, their magnetic properties a ...

Nature Publishing Group2009

Role of hydrogen in giant spin polarization observed on magnetic nanostructures

Harald Brune, Stefano Rusponi

We demonstrate that the giant spin contrast observed by scanning tunneling microscopy for double-layer Coislands on Pt(111) is caused by adsorbates at the apex of the Cr-coated W tip. The most likely candidate, in ab initio simulations, is hydrogen. Here, ...

2008

Does the Surface Matter? Hydrogen-Bonded Chain Formation of an Oxalic Amide Derivative in a Two- and Three-Dimensional Environment

Harald Brune, Klaus Kern, Sylvain Clair, Marta Canas Ventura, Uta Schlickum

We report on a multi-technique investigation of the supramolecular organisation of N,N-diphenyl oxalic amide under differently dimensioned environments, namely three-dimensional (3D) in the bulk crystal, and in two dimensions on the Ag(111) surface as well ...

2008

Chiral kagome lattice from simple ditopic molecular bricks

Harald Brune, Klaus Kern, Régis Decker, Uta Schlickum

Self-assembly techniques allow for the fabrication of highly organized architectures with atomic-level precision. Here, we report on molecular-level scanning tunneling microscopy observations demonstrating the supramolecular engineering of complex, regular ...

American Chemical Society2008

The role of magnetic anisotropy in the Kondo effect

Harald Brune, Markus Ternes

In the Kondo effect, a localized magnetic moment is screened by forming a correlated electron system with the surrounding conduction electrons of a non-magnetic host1. Spin S D 1=2 Kondo systems have been investigated extensively in theory and experiments, ...

Nature Publishing Group2008

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

Harald Brune, Pietro Gambardella, Stefano Rusponi, Anne Lehnert, Géraud Moulas, Markus Etzkorn

2008

Creating Metal Nanostructures at Metal Surfaces Using Growth Kinetics

Harald Brune

Elsevier2008

Using metal-organic templates to steer the growth of Fe and Co nanoclusters

Harald Brune, Régis Decker, Uta Schlickum

AIP American Institute of Physics2008

Surface characterization of MnxGe1-x and CryMnxGe1-x-y dilute magnetic semiconductors

Laurent Claude, Harald Brune, Pietro Gambardella, Stefano Rusponi

We have used x-ray photoemission electron microscopy (XPEEM) and x-ray absorption spectroscopy (XAS) to characterize MnxGe1-x and CryMnxGe1-x-y films grown by molecular beam epitaxy. The surface layers of the as-grown films probed by XPEEM present segregat ...

2007

Magnetic properties of 2D islands on single crystal metal surfaces

Harald Brune, Stefano Rusponi

2007

Conformational adaptation in supramolecular assembly on surfaces

Harald Brune, Klaus Kern, Sylvain Clair, Marta Canas Ventura, Uta Schlickum

2007

Self-assembly of periodic bicomponent wires and ribbons

Harald Brune, Marta Canas Ventura

Wiley-VCH Verlag GmbH2007

Probing magnetism at the nanoscale

Harald Brune

2007

Metal-organic honeycomb nanomeshes with tunable cavity size

Harald Brune, Klaus Kern, Régis Decker

We present a systematic study of metal-organic honeycomb lattices assembled from simple ditopic molecular bricks and Co atoms on Ag(111). This approach enables us to fabricate size- and shape-controlled open nanomeshes with pore dimensions up to 5.7 nm. Th ...

2007

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