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Journal Article

Experimental Determination of Single Molecule Toroic Behaviour in a Dy8 Single-Molecule Magnet


Baldovi,  J.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Zhang, Q., Baker, M. L., Li, S., Sarachik, M. P., Baldovi, J., Gaita-Ariño, A., et al. (2019). Experimental Determination of Single Molecule Toroic Behaviour in a Dy8 Single-Molecule Magnet. Nanoscale, 11(32), 15131-15138. doi:10.1039/C9NR05182A.

Cite as: https://hdl.handle.net/21.11116/0000-0004-5ABB-5
The enhancement of toroic motifs through coupling toroidal moments within molecular nanomagnets is a new, interesting and relevant approach for both fundamental research and potential quantum computation applications. We investigate a Dy8 molecular cluster and discover it has a antiferrotoroic ground state with slow magnetic relaxation. The experimental characterization of the magnetic anisotropy axes of each magnetic center and their exchange interactions represents a considerable challenge due to the non-magnetic nature of the toroidal motif. To overcome this and obtain access to the low energy states of Dy8 we establish a multi-orientation single-crystal micro Hall sensor magnetometry approach. Using an effective Hamiltonian model we then unpick the microscopic spin structure of Dy8, leading to a canted antiferrotoroidic tetramer molecular ground state. These findings are supported with electrostatic calculations that independently confirm the experimentally determined magnetic anisotropy axes for each DyIII ion within the molecule.