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Updated: Jan 3, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
Polyanisotropic Magnetoelectric Coupling in an Electrically Controlled Molecular Spin Qubit
Jérôme Robert1,2, Nathalie Parizel1, Philippe Turek1
1Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra) , Université de Strasbourg , 4 rue Blaise Pascal , CS 90032, F-67081 Strasbourg , France.
Abstract:
Two molecular spin qubits are studied with pulsed electron paramagnetic resonance (EPR) spectroscopy under electric fields to assess their magnetoelectric (ME) couplings and electric spin control. [Fe3O(PhCOO)6(py)3]ClO4·py (Fe) is characterized by strong Dzyaloshinskii-Moriya interactions (DMI) which induce important magnetoanisotropy, whereas the DMI in [Cr3O(PhCOO)6(py)3]ClO4·0.5py (Cr) is 1-2 orders of magnitude weaker. Fe 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). The electric control in Fe is shown to be coherent, and the ME effect exhibits complex dynamics characterized by saturation and oscillatory effects. On the other hand, Cr exhibits no discernible ME effect, which correlates well with its negligible DMI.
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