Evolution of cooperativity in the spin transition of an iron(II) complex on a graphite surface
| Autor: | Wolfgang Kuch, Matthias Bernien, Lalminthang Kipgen, Andrew J. Britton, Felix Tuczek, Hanjo Ryll, Eugen Weschke, Christian Lotze, Holger Naggert, Enrico Schierle, Lucas M. Arruda, Chen Luo, Florin Radu, Sascha Ossinger, Fabian Nickel |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Absorption spectroscopy Molecular electronics Science Spin transition General Physics and Astronomy Cooperativity Large scale facilities for research with photons neutrons and ions 02 engineering and technology 010402 general chemistry 01 natural sciences General Biochemistry Genetics and Molecular Biology Article Highly oriented pyrolytic graphite Magnetic properties and materials Monolayer Graphite lcsh:Science Magnetic materials Spin-½ Molecular self-assembly Multidisciplinary General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Chemical physics lcsh:Q Condensed Matter::Strongly Correlated Electrons 0210 nano-technology |
| Zdroj: | Nature Communications, Vol 9, Iss 1, Pp 1-8 (2018) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | Cooperative effects determine the spin-state bistability of spin-crossover molecules (SCMs). Herein, the ultimate scale limit at which cooperative spin switching becomes effective is investigated in a complex [Fe(H2B(pz)2)2(bipy)] deposited on a highly oriented pyrolytic graphite surface, using x-ray absorption spectroscopy. This system exhibits a complete thermal- and light-induced spin transition at thicknesses ranging from submonolayers to multilayers. On increasing the coverage from 0.35(4) to 10(1) monolayers, the width of the temperature-induced spin transition curve narrows significantly, evidencing the buildup of cooperative effects. While the molecules at the submonolayers exhibit an apparent anticooperative behavior, the multilayers starting from a double-layer exhibit a distinctly cooperative spin switching, with a free-molecule-like behavior indicated at around a monolayer. These observations will serve as useful guidelines in designing SCM-based devices. Spin-crossover molecules offer a potential route towards molecular spintronics, but retaining the bistability of the spin state upon surface deposition is challenging. Here, the authors study the spin-crossover behaviours of an Fe(II) complex deposited on graphite, determining the scale limit at which cooperative spin switching becomes effective. |
| Databáze: | OpenAIRE |
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