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Harald Brune

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Related publications (117)

Page 4 of 6

Nucleation of ordered Fe islands on Al2O3/Ni3Al(111)

Harald Brune, Stefano Rusponi, Anne Lehnert, Régis Decker

Scanning tunneling microscopy (STM) has been used to investigate the nucleation and stability of iron clusters on the Al2O3/Ni3Al (111) surface as a function of coverage and annealing temperature. We show that atomic beam deposition of iron leads to hexago ...

2006

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

Harald Brune, Stefano Rusponi, Pietro Gambardella, Laurent Claude

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

Uniaxial 2D Superlattice of Fe-4 Molecular Magnets on Graphene

Harald Brune, Stefano Rusponi, Luca Gragnaniello

We demonstrate that electrospray deposition enables the fabrication of highly periodic self-assembled arrays of Fe4H single molecule magnets on graphene/Ir(111). The energetic positions of molecular states are probed by means of scanning tunneling spectros ...

American Chemical Society2017

Magnetic Moment and Anisotropy of Individual Co Atoms on Graphene

Harald Brune, Oleg Yazyev, François Patthey, Pietro Gambardella, Fabio Donati, Gabriel Albert Autes, Quentin Dubout

We report on the magnetic properties of single Co atoms on graphene on Pt(111). By means of scanning tunneling microscopy spin-excitation spectroscopy, we infer a magnetic anisotropy of K = -8.1 meV with out-of-plane hard axis and a magnetic moment of 2.2 ...

American Physical Society2013

Optical properties of size selected neutral Ag clusters: electronic shell structures and the surface plasmon resonance

Harald Brune, Wolfgang Harbich, Chongqi Yu

We present optical absorption spectra from the ultraviolet to the visible for size selected neutral Ag-n clusters (n = 5-120) embedded in solid Ne. We compare the spectra to time-dependent density functional calculations (TDDFT) that address the influence ...

ROYAL SOC CHEMISTRY2018

Mapping Orbital-Resolved Magnetism in Single Lanthanide Atoms

Harald Brune, Stefano Rusponi, Marina Pivetta, Fabio Donati, Aparajita Singha

Single lanthanide atoms and molecules are promising candidates for atomic data storage and quantum logic due to the long lifetime of their magnetic quantum states. Accessing and controlling these states through electrical transport requires precise knowled ...

AMER CHEMICAL SOC2021

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

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

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

Magnetic properties of on-surface synthesized single-ion molecular magnets

Harald Brune, Stefano Rusponi, Marina Pivetta, Jan Gui-Hyon Dreiser, Christian Wäckerlin, Aparajita Singha, Katharina Johanna Diller

We perform on-surface synthesis of single-ion molecular magnets on an Ag(111) surface and characterize their morphology, chemistry, and magnetism. The first molecule we synthesize is TbPc2 to enable comparison with chemically synthesized and subsequently s ...

2019

Metal-organic honeycomb nanomeshes with tunable cavity size

Klaus Kern, Harald Brune, 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

Magnetism of Fe clusters and islands on Pt surfaces

Klaus Kern, Harald Brune, Stefano Rusponi

Clusters and islands of Fe atoms have been prepared by noble gas buffer layer assisted growth as well as by standard molecular beam epitaxy on Pt substrates. Xe buffer layers have been utilized to promote the formation of compact, relaxed Fe clusters with ...

2006

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

Correlation between Electronic Configuration and Magnetic Stability in Dysprosium Single Atom Magnets

Harald Brune, Stefano Rusponi, Marina Pivetta, Jan Gui-Hyon Dreiser, Pietro Gambardella, Fabio Donati, Christian Wäckerlin, Aparajita Singha, Romana Baltic, Edgar Fernandes, Jean-Guillaume De Groot

Single atom magnets offer the possibility of magnetic information storage in the most fundamental unit of matter. Identifying the parameters that control the stability of their magnetic states is crucial to design novel quantum magnets with tailored proper ...

AMER CHEMICAL SOC2021

Large Area Monolayer Graphene Transfer in Ultra-High Vacuum

Harald Brune, Stefano Rusponi, Darius Constantin Merk

Graphene transfer methods either employ support layers that have to be removed after transfer, giving rise to impurities, or are based on delamination from bulk crystals, yielding only small flakes with various thicknesses. We present a graphene transfer m ...

American Chemical Society (ACS)2025

Isolated Pd Sites on the Intermetallic PdGa(111) and PdGa($\bar 1$ $\bar 1$ $\bar 1$) Model Catalyst Surfaces

Harald Brune

Wiley-Blackwell2012

Competing Interactions in the Self-Assembly of NC-Ph-3-CN Molecules on Cu(111)

Harald Brune, Marina Pivetta, Giulia Elisabetta Pacchioni

We report on low-temperature scanning tunneling microscopy and spectroscopy measurements on NC-Ph-3-CN molecules adsorbed at 300 K on a Cu(111) surface. Upon cooling, the molecules form chain and honeycomb structures, incorporating Cu adatoms supplied by t ...

American Chemical Society2015

Giant apparent lattice distortions in STM images of corrugated sp2-hybridised monolayers

Alfredo Pasquarello, Harald Brune, François Patthey, Stefano Rusponi, Donat Fabian Natterer, Anne Lehnert, Quentin Dubout, Laurent Claude

We report on the strengths and limitations of scanning tunnelling microscopy (STM) when used for characterising atomic-scale features of quasi two-dimensional materials, such as graphene and single layers of hexagonal boron nitride, which may present stron ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2016

Effect of the TiO2 Reduction State on the Catalytic CO Oxidation on Deposited Size-Selected Pt Clusters

Harald Brune, Wolfgang Harbich, Simon Bonanni

The catalytic activity of deposited Pt-7 clusters has been studied as a function of the reduction state of the TiO2(110)-(1 x 1) support for the CO oxidation reaction. While a slightly reduced support gives rise to a high catalytic activity of the adpartic ...

2012

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

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

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

Equilibrium island-size distribution in one dimension

Klaus Kern, Harald Brune, Pietro Gambardella

We derive an analytical expression for the size distribution of monoatomic wires in the framework of a one-dimensional lattice gas model at thermodynamic equilibrium. The theoretical results are compared with the size distribution of one-dimensional Ag wir ...

2006

Magnetism and morphology of Co nanocluster superlattices on GdAu2/Au(111)-(13 x 13)

Harald Brune, Stefano Rusponi, Alberto Cavallin

We present a comprehensive study of the magnetism and morphology of an ultrahigh density array of Co nanoclusters self-assembled on the single atomic layer GdAu2 on Au(111) template surface. Combining scanning tunneling microscopy, x-ray magnetic circular ...

American Physical Society2014