Near-Room-Temperature Magnetoelectric Coupling via Spin Crossover in an Iron(II) Complex

Magdalena Owczarek, Minseong Lee, Shuanglong Liu, Ella R. Blake, Chloe S. Taylor, Georgia A. Newman, James C. Eckert, Juan H. Leal, Troy A. Semelsberger, Hai Ping Cheng, Wanyi Nie, Vivien S. Zapf

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12 Scopus citations

Abstract

Magnetoelectric coupling is achieved near room temperature in a spin crossover FeII molecule-based compound, [Fe(1bpp)2](BF4)2. Large atomic displacements resulting from Jahn–Teller distortions induce a change in the molecule dipole moment when switching between high-spin and low-spin states leading to a step-wise change in the electric polarization and dielectric constant. For temperatures in the region of bistability, the changes in magnetic and electrical properties are induced with a remarkably low magnetic field of 3 T. This result represents a successful expansion of magnetoelectric spin crossovers towards ambient conditions. Moreover, the observed 0.3–0.4 mC m−2 changes in the H-induced electric polarization suggest that the high strength of the coupling obtained via this route is accessible not just at cryogenic temperatures but also near room temperature, a feature that is especially appealing in the light of practical applications.

Original languageEnglish
Article numbere202214335
JournalAngewandte Chemie - International Edition
Volume61
Issue number52
DOIs
StatePublished - Dec 23 2022

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