Molecular ferroelectric with low-magnetic-field magnetoelectricity at room temperature

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 () and You Song ()
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Zhao-Bo Hu: Nanjing University
Xinyu Yang: Southeast University
Jinlei Zhang: Suzhou University of Science and Technology
Ling-Ao Gui: Jiangxi University of Science and Technology
Yi-Fan Zhang: Jiangxi University of Science and Technology
Xiao-Dong Liu: Nanjing University
Zi-Han Zhou: Nanjing University
Yucheng Jiang: Suzhou University of Science and Technology
Yi Zhang: Zhejiang Normal University
Shuai Dong: Southeast University
You Song: Nanjing University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Magnetoelectric materials, which encompass coupled magnetic and electric polarizabilities within a single phase, hold great promises for magnetic controlled electronic components or electric-field controlled spintronics. However, the realization of ideal magnetoelectric materials remains tough due to the inborn competion between ferroelectricity and magnetism in both levels of symmetry and electronic structure. Herein, we introduce a methodology for constructing single phase paramagnetic ferroelectric molecule [TMCM][FeCl4], which shows low-magnetic-field magnetoelectricity at room temperature. By applying a low magnetic field (≤1 kOe), the halogen Cl‧‧‧Cl distance and the volume of [FeCl4]− anions could be manipulated. This structural change causes a characteristic magnetostriction hysteresis, resulting in a substantial deformation of ~10−4 along the a-axis under an in-plane magnetic field of 2 kOe. The magnetostrictive effect is further qualitatively simulated by density functional theory calculations. Furthermore, this mechanical deformation significantly dampens the ferroelectric polarization by directly influencing the overall dipole configuration. As a result, it induces a remarkable α31 component (~89 mV Oe−1 cm−1) of the magnetoelectric tensor. And the magnetoelectric coupling, characterized by the change of polarization, reaches ~12% under 40 kOe magnetic field. Our results exemplify a design methodology that enables the creation of room-temperature magnetoelectrics by leveraging the potent effects of magnetostriction.

Date: 2024
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DOI: 10.1038/s41467-024-49053-y

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