Strong Exchange Couplings Drastically Slow Down Magnetization Relaxation in an Air-Stable Cobalt(II)-Radical Single-Molecule Magnet (SMM)

Uta Albold; Heiko Bamberger; Philipp P Hallmen; Joris van Slageren; Biprajit Sarkar

doi:10.1002/anie.201904645

Strong Exchange Couplings Drastically Slow Down Magnetization Relaxation in an Air-Stable Cobalt(II)-Radical Single-Molecule Magnet (SMM)

Angew Chem Int Ed Engl. 2019 Jul 15;58(29):9802-9806. doi: 10.1002/anie.201904645. Epub 2019 Jun 6.

Authors

Uta Albold¹, Heiko Bamberger², Philipp P Hallmen², Joris van Slageren², Biprajit Sarkar¹

Affiliations

¹ Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstrasse 34-36, 14195, Berlin, Germany.
² Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany.

Abstract

The energy barrier leading to magnetic bistability in molecular clusters is determined by the magnetic anisotropy of the cluster constituents. By incorporating a highly anisotropic four-coordinate cobalt(II) building block into a strongly coupled fully air- and moisture-stable three-spin system, it proved possible to suppress under-barrier Raman processes leading to 350-fold increase of magnetization relaxation time and pronounced hysteresis. Relaxation times of up to 9 hours at low temperatures were found.

Keywords: Raman process; cobalt; hysteresis; molecular magnetism; single-molecule magnet.

Abstract

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