Title: Near‐Room‐Temperature Magnetoelectric Coupling via Spin Crossover in an Iron(II) Complex

Journal Article · · Angewandte Chemie (International Edition)
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [4];  [4];  [4]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [2]
  1. Center for Integrated Nanotechnologies Los Alamos National Laboratory Los Alamos NM 87545 USA
  2. National High Magnetic Field Laboratory Los Alamos National Laboratory Los Alamos NM 87545 USA
  3. Department of Physics Quantum Theory Project Center for Molecular Magnetic Quantum Materials University of Florida Gainesville FL 32611 USA
  4. Harvey Mudd College Claremont CA 91711 USA
  5. 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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