Bulk-Like Magnetic Signature of Individual Fe4H Molecular Magnets on Graphene

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ACS Nano. 2019, 13(1), pp. 780-785. ISSN 1936-0851. eISSN 1936-086X. Available under: doi: 10.1021/acsnano.8b08184
Zusammenfassung

Single-molecule magnets (SMMs) incorporate key properties that make them promising candidates for the emerging field of spintronics. The challenge to realize ordered SMM arrangements on surfaces and at the same time to preserve the magnetic properties upon interaction with the environment is a crucial point on the way to applications. Here we employ inelastic electron tunneling spectroscopy (IETS) to address the magnetic properties in single Fe4 complexes that are adsorbed in a highly ordered arrangement on graphene/Ir(111). We are able to substantially reduce the influence of both the tunneling tip and the adsorption environment on the Fe4 complex during the measurements by using appropriate tunneling parameters in combination with the flat-lying Fe4H derivative and a weakly interacting surface. This allows us to perform noninvasive IETS studies on these bulky molecules. From the measurements we identify intermultiplet spin transitions and determine the intramolecular magnetic exchange interaction constant on a large number of molecules. Although a considerable scattering of the exchange constant values is observed, the distribution maximum is located at a value that coincides with that of the bulk. Our findings confirm a retained molecular magnetism of the Fe4H complex at the local scale and evaluate the influence of the environment on the magnetic exchange interaction.

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530 Physik
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electrospray deposition; graphene; inelastic electron tunneling spectroscopy; scanning tunneling microscopy; single-molecule magnet
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ISO 690PASCHKE, Fabian, Philipp ERLER, Vivien Anna-Lena ENENKEL, Luca GRAGNANIELLO, Mikhail FONIN, 2019. Bulk-Like Magnetic Signature of Individual Fe4H Molecular Magnets on Graphene. In: ACS Nano. 2019, 13(1), pp. 780-785. ISSN 1936-0851. eISSN 1936-086X. Available under: doi: 10.1021/acsnano.8b08184
BibTex
@article{Paschke2019-01-22BulkL-44559,
  year={2019},
  doi={10.1021/acsnano.8b08184},
  title={Bulk-Like Magnetic Signature of Individual Fe<sub>4</sub>H Molecular Magnets on Graphene},
  number={1},
  volume={13},
  issn={1936-0851},
  journal={ACS Nano},
  pages={780--785},
  author={Paschke, Fabian and Erler, Philipp and Enenkel, Vivien Anna-Lena and Gragnaniello, Luca and Fonin, Mikhail}
}
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