LNS-Keyvisual

Professor Harald Brune’s research program focuses on the exploration of the novel physical and chemical properties arising when metals shrink to the nanoscale. Starting from a detailed understanding of epitaxial growth, derived from variable temperature scanning tunneling microscopy (STM) experiments compared with theoretical modeling, we use self-assembly to grow metallic nanostructures with the desired morphology, size, and spacing at single crystal surfaces. These samples are then investigated either by spatially integrating measurements, revealing the properties of the ensemble of nanostructures, or by addressing some of the properties of interest directly at the atomic scale by means of STM. We intend to identify the individual contributions of each of the differently coordinated constituent atoms with the ultimate goal to engineer nanostructures with desired properties, such as magnetic anisotropy energy and moment, spin-polarization at the Fermi level, chemical reactivity and selectivity.

Highlights

_________________________________________________________________________________________

Stability of Holmium Single Atom Magnets

Magnetic contrast on Ho atoms

F. D. Natterer, F. Donati, F. Patthey, and H. Brune, Thermal and Magnetic-Field Stability of Holmium Single-Atom Magnets, Phys. Rev. Lett. 121, 027201 (2018).

_________________________________________________________________________________________

2D Superlattice of Single Atom Magnets

Dy single atom magnet superlattice

R. Baltic, M. Pivetta, F. Donati, Ch. Wäckerlin, A. Singha, J. Dreiser, S. Rusponi, and H. Brune, Superlattice of Single Atom Magnets on Graphene, Nano Lett. 16, 7610 (2016).

Featured in  Phys.org

__________________________________________________________________________________________

Magnetic remanence in single Ho atoms on MgO

STM image Ho on MgO

F. Donati, S. Rusponi, S. Stepanow, Ch. Wäckerlin, A. Singha, L. Persichetti, R. Baltic, K. Diller, F. Patthey, E. Fernandes, J. Dreiser,  Ž. Šljivančanin, K. Kummer, C. Nistor, P. Gambardella, and H. Brune, Magnetic remanence in single atomsScience 352, 318 (2016).

Featured in Phys.org, ESFR – Spotlight on Science

__________________________________________________________________________________________

Reaching the magnetic anisotropy limit of a 3d metal atom

Co atoms on MgO - an artist view

I. G. Rau, S. Baumann, S. Rusponi, F. Donati, S. Stepanow, L. Gragnaniello, J. Dreiser, C. Piamonteze, F. Nolting, S. Gangopadhyay, O. R. Albertini, R. M. Macfarlane, Ch. P. Lutz, B. A. Jones, P. Gambardella, A. J. Heinrich, and H. Brune, Reaching the magnetic anisotropy limit of a 3d metal atom, Science 344, 988 (2014).

Featured in ScienceDaily

__________________________________________________________________________________________

CO oxidation by surface-supported Pt clusters

Pt3 on TiO2(110)

S. Bonanni, K. Aït-Mansour, W.Harbich, and H. Brune, Reaction-Induced Cluster Ripening and Initial Size-Dependent Reaction-rates for CO Oxidation on Ptn/TiO2(110)-(1 x 1), J. Am. Chem. Soc. 136, 8702 (2014)

__________________________________________________________________________________________

 Magnetic Moment and Anisotropy of Individual Co Atoms on Graphene

spin excitation spectroscopy

F. Donati, Q. Dubout, G. Autès, F. Patthey, F. Calleja, P. Gambardella, O. V. Yazyev and H. Brune, Magnetic Moment and Anisotropy of Individual Co Atoms on Graphene, Phys. Rev. Lett. 111, 236801 (2013)

__________________________________________________________________________________________

Distinction of Nuclear Spin States with the Scanning Tunneling Microscope

H2 spectroscopyF. D. Natterer, F. Patthey, and H. Brune, Distinction of Nuclear Spin States with the Scanning Tunneling Microscope, Phys. Rev. Lett. 111, 175303 (2013)

__________________________________________________________________________________________

Self-assembled superlattice of Fe clusters

Fe clusterM. Pivetta, G. E. Pacchioni, U. Schlickum, J. V. Barth, and H. Brune, Formation of Fe Cluster Superlattice in a Metal-Organic Quantum-Box Network, Phys. Rev. Lett. 110, 086102 (2013)

__________________________________________________________________________________________

Magnetic anisotropy of nanostructures

Pd-decorated Co islands on Pt(111)S. Ouazi, S. Vlaic, S. Rusponi, G. Moulas, P. Buluschek, K. Halleux, S. Bornemann, S. Mankovsky, J. Minár, J. B. Staunton, H. Ebert and H. Brune, Atomic-scale engineering of magnetic anisotropy of nanostructures through interfaces and interlines, Nat. Commun. 3, 1313 (2012)

__________________________________________________________________________________________