This paper introduces a single-phase paramagnetic ferroelectric molecule, [TMCM][FeCl4], exhibiting low-magnetic-field magnetoelectricity at room temperature. Applying a low magnetic field manipulates the halogen Cl…Cl distance and [FeCl4] anion volume, causing magnetostriction and a substantial deformation. This deformation influences the ferroelectric polarization, inducing a significant magnetoelectric tensor component (-89 mV Oe⁻¹ cm²) and a polarization change of -12% under a 40 kOe field. This demonstrates a design methodology for room-temperature magnetoelectrics leveraging magnetostriction.

Zhao-Bo Hu, Xinyu Yang, Jinlei Zhang, Ling-Ao Gui, Yi-Fan Zhang, Xiao-Dong Liu, Zi-Han Zhou, Yucheng Jiang, Yi Zhang, Shuai Dong, You Song