Near‐Room‐Temperature Magnetoelectric Coupling via Spin Crossover in an Iron(II) Complex
- Center for Integrated Nanotechnologies Los Alamos National Laboratory Los Alamos NM 87545 USA
- National High Magnetic Field Laboratory Los Alamos National Laboratory Los Alamos NM 87545 USA
- Department of Physics Quantum Theory Project Center for Molecular Magnetic Quantum Materials University of Florida Gainesville FL 32611 USA
- Harvey Mudd College Claremont CA 91711 USA
- Materials Physics and Applications Division Los Alamos National Laboratory Los Alamos NM 87545 USA
Abstract Magnetoelectric coupling is achieved near room temperature in a spin crossover Fe II molecule‐based compound, [Fe(1bpp) 2 ](BF 4 ) 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.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)
- Grant/Contract Number:
- 89233218CNA000001; SC0019330
- OSTI ID:
- 1899735
- Report Number(s):
- LA-UR-22-31219; LA-UR-23-32830; e202214335
- Journal Information:
- Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 52 Vol. 61; ISSN 1433-7851
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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