Quantum engineering of spin and anisotropy in magnetic molecular junctions

Single molecule magnets and single spin centres can be individually addressed when coupled to contacts forming an electrical junction. To control and engineer the magnetism of quantum devices, it is necessary to quantify how the structural and chemical environment of the junction affects the spin ce...

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Bibliographic Details
Published in:Nature communications 2015-10, Vol.6 (1), p.8536-8536, Article 8536
Main Authors: Jacobson, Peter, Herden, Tobias, Muenks, Matthias, Laskin, Gennadii, Brovko, Oleg, Stepanyuk, Valeri, Ternes, Markus, Kern, Klaus
Format: Article
Language:English
Subjects:
639/766/119/1001
639/766/119/997
639/766/25
639/766/483/1139
Adsorption
Anisotropy
Boron
Boron nitride
Cobalt
Computer simulation
Coordination compounds
Coordination numbers
Coupling (molecular)
Electric contacts
Electrical junctions
Exchanging
Humanities and Social Sciences
Hybridization
Hydrogen
Magnetic anisotropy
Magnetism
Magnets
Many body interactions
Metals
Microscopy
multidisciplinary
Organic chemistry
Scanning tunneling microscopy
Science
Science (multidisciplinary)
Spectroscopy
Spectrum analysis
Symmetry
Topography
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Summary:Single molecule magnets and single spin centres can be individually addressed when coupled to contacts forming an electrical junction. To control and engineer the magnetism of quantum devices, it is necessary to quantify how the structural and chemical environment of the junction affects the spin centre. Metrics such as coordination number or symmetry provide a simple method to quantify the local environment, but neglect the many-body interactions of an impurity spin coupled to contacts. Here, we utilize a highly corrugated hexagonal boron nitride monolayer to mediate the coupling between a cobalt spin in CoH x ( x =1,2) complexes and the metal contact. While hydrogen controls the total effective spin, the corrugation smoothly tunes the Kondo exchange interaction between the spin and the underlying metal. Using scanning tunnelling microscopy and spectroscopy together with numerical simulations, we quantitatively demonstrate how the Kondo exchange interaction mimics chemical tailoring and changes the magnetic anisotropy. The spins of single molecules and defect centres possess properties which can be strongly influenced by their material contacts in electrical junctions. Here, the authors study the coupling between cobalt hydride complexes and a Rh(111) contact, mediated through a hexagonal boron nitride layer.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms9536