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Highly Ordered Surface Self-Assembly of Fe4 Single Molecule Magnets

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2015

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Nano Letters. 2015, 15(7), pp. 4546-4552. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.5b01120

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Single molecule magnets (SMMs) have attracted considerable attention due to low-temperature magnetic hysteresis and fascinating quantum effects. The investigation of these properties requires the possibility to deposit well-defined monolayers or spatially isolated molecules within a well-controlled adsorption geometry. Here we present a successful fabrication of self-organized arrays of Fe4 SMMs on hexagonal boron nitride (h-BN) on Rh(111) as template. Using a rational design of the ligand shell optimized for surface assembly and electrospray as a gentle deposition method, we demonstrate how to obtain ordered arrays of molecules forming perfect hexagonal superlattices of tunable size, from small islands to an almost perfect monolayer. High-resolution low temperature scanning tunneling microscopy (STM) reveals that the Fe4 molecule adsorbs on the substrate in a flat geometry, meaning that its magnetic easy axis is perpendicular to the surface. By scanning tunneling spectroscopy (STS) and density functional theory (DFT) calculations, we infer that the majority- and minority-spin components of the spin-split lowest unoccupied molecular orbital (LUMO) can be addressed separately on a submolecular level.

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ISO 690ERLER, Philipp, Peter SCHMITT, Nicole BARTH, Andreas IRMLER, Samuel BOUVRON, Thomas HUHN, Ulrich GROTH, Fabian PAULY, Luca GRAGNANIELLO, Mikhail FONIN, 2015. Highly Ordered Surface Self-Assembly of Fe4 Single Molecule Magnets. In: Nano Letters. 2015, 15(7), pp. 4546-4552. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.5b01120
BibTex
@article{Erler2015-06-18Highl-31221,
  year={2015},
  doi={10.1021/acs.nanolett.5b01120},
  title={Highly Ordered Surface Self-Assembly of Fe<sub>4</sub> Single Molecule Magnets},
  number={7},
  volume={15},
  issn={1530-6984},
  journal={Nano Letters},
  pages={4546--4552},
  author={Erler, Philipp and Schmitt, Peter and Barth, Nicole and Irmler, Andreas and Bouvron, Samuel and Huhn, Thomas and Groth, Ulrich and Pauly, Fabian and Gragnaniello, Luca and Fonin, Mikhail}
}
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    <dcterms:abstract xml:lang="eng">Single molecule magnets (SMMs) have attracted considerable attention due to low-temperature magnetic hysteresis and fascinating quantum effects. The investigation of these properties requires the possibility to deposit well-defined monolayers or spatially isolated molecules within a well-controlled adsorption geometry. Here we present a successful fabrication of self-organized arrays of Fe&lt;sub&gt;4&lt;/sub&gt; SMMs on hexagonal boron nitride (h-BN) on Rh(111) as template. Using a rational design of the ligand shell optimized for surface assembly and electrospray as a gentle deposition method, we demonstrate how to obtain ordered arrays of molecules forming perfect hexagonal superlattices of tunable size, from small islands to an almost perfect monolayer. High-resolution low temperature scanning tunneling microscopy (STM) reveals that the Fe&lt;sub&gt;4&lt;/sub&gt; molecule adsorbs on the substrate in a flat geometry, meaning that its magnetic easy axis is perpendicular to the surface. By scanning tunneling spectroscopy (STS) and density functional theory (DFT) calculations, we infer that the majority- and minority-spin components of the spin-split lowest unoccupied molecular orbital (LUMO) can be addressed separately on a submolecular level.</dcterms:abstract>
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