A four-coordinate cobalt(II) single-ion magnet with coercivity and a very high energy barrier

Yvonne Rechkemmer, Frauke D. Breitgoff, Margarethe van der Meer, Mihail Atanasov (), Michael Hakl, Milan Orlita, Petr Neugebauer, Frank Neese, Biprajit Sarkar () and Joris van Slageren ()
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Yvonne Rechkemmer: Institut für Physikalische Chemie, Universität Stuttgart
Frauke D. Breitgoff: Institut für Physikalische Chemie, Universität Stuttgart
Margarethe van der Meer: Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universität Berlin
Mihail Atanasov: Max Planck Institute for Chemical Energy Conversion
Michael Hakl: Laboratoire national des champs magnétiques intenses, CNRS-UJF-UPS-INS
Milan Orlita: Laboratoire national des champs magnétiques intenses, CNRS-UJF-UPS-INS
Petr Neugebauer: Institut für Physikalische Chemie, Universität Stuttgart
Frank Neese: Max Planck Institute for Chemical Energy Conversion
Biprajit Sarkar: Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universität Berlin
Joris van Slageren: Institut für Physikalische Chemie, Universität Stuttgart

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Single-molecule magnets display magnetic bistability of molecular origin, which may one day be exploited in magnetic data storage devices. Recently it was realised that increasing the magnetic moment of polynuclear molecules does not automatically lead to a substantial increase in magnetic bistability. Attention has thus increasingly focussed on ions with large magnetic anisotropies, especially lanthanides. In spite of large effective energy barriers towards relaxation of the magnetic moment, this has so far not led to a big increase in magnetic bistability. Here we present a comprehensive study of a mononuclear, tetrahedrally coordinated cobalt(II) single-molecule magnet, which has a very high effective energy barrier and displays pronounced magnetic bistability. The combined experimental-theoretical approach enables an in-depth understanding of the origin of these favourable properties, which are shown to arise from a strong ligand field in combination with axial distortion. Our findings allow formulation of clear design principles for improved materials.

Date: 2016
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DOI: 10.1038/ncomms10467

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