JACS [POMAM]

Abstract :

Two molecular spin triangles are studied with pulsed Electron Paramagnetic Resonance (EPR) spectroscopy to assess their magnetoelectric (ME) couplings. [Fe₃O(PhCOO)₆(py)₃]ClO₄·py (Fe₃) is characterized by strong Dzyaloshinskii-Moriya interactions (DMI) which induce important magnetoanisotropy, whereas the DMI in [Cr₃O(PhCOO)₆(py)₃]ClO₄·0.5py (Cr₃) is 1-2 orders of magnitude weaker. By monitoring the Hahn echos under the influence of electric pulses, Fe₃ is observed to demonstrate a clear ME effect whose intensity shows an unprecedented dependence on the molecular orientation within the electric field E (electroanisotropy) and on the relative orientations of the molecular z-axis, the Zeeman field B₀ and E (magnetoelectric anisotropy). In addition, the ME effect in Fe₃ exhibits complex dynamics characterized by saturation and oscillatory effects. On the other hand, Cr₃ exhibits no discernible ME effect, which correlates well with its negligible DMI.

Graphical Abstract:

 

Reference :

Jérôme Robert, Nathalie Parizel, Philippe Turek, and Athanassios K. Boudalis

Polyanisotropic magnetoelectric coupling in an electrically controlled molecular spin qubit

J. Am. Chem. Soc. 2019 – DOI : https://pubs.acs.org/doi/10.1021/jacs.9b09101

 

Contact chercheur :

Athanassios K. Boudalis (https://pomam.chimie.unistra.fr/aboudalis/), POMAM, Institut de Chimie (UMR 7177).