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

Qing Zhang, Michael Lloyd Baker, Shiqi Li, Myriam P Sarachik, José J. Baldoví, Alejandro Gaita-ariño, Eugenio Coronado, Theocharis Stamatatos, Dimitris Alexandropoulos

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    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 singlecrystal 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.
    Original languageEnglish
    Early online date29 Jul 2019
    Publication statusPublished - 2019


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