Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session A38: Magnetoelectric and Multiferroic Effects in Molecular Systems
8:00 AM–11:00 AM,
Monday, March 4, 2019
BCEC
Room: 206B
Sponsoring
Units:
GMAG DMP
Chair: Janice Musfeldt, Univ of Tennessee, Knoxville
Abstract: A38.00004 : Electric field modulation of magnetic exchange in molecular helices detected by Electron Paramagnetic Resonance*
8:36 AM–9:12 AM
Presenter:
Roberta Sessoli
(Department of Chemistry, University of Florence, Italy)
Authors:
Maria Fittipaldi
(Department of Physics, University of Florence, Italy)
Alberto Cini
(Department of Physics, University of Florence, Italy)
Giuseppe Annino
(Istituto per i Processi Chimico-Fisici - IPCF, CNR, Italy)
Alessandro Vindigni
(Physics, ETH, Zurich, Switzerland)
Andrea Caneschi
(Department of Industrial Engineering, University of Florence, Italy)
Roberta Sessoli
(Department of Chemistry, University of Florence, Italy)
Here, we report the detection of a magnetoelectric effect that we attribute to an electric field modulation of the magnetic exchange interaction theoretically predicted for molecular magnetic helices. On a Manganese(II)-radical helix, thus comprising spin centers with negligible orbital contribution, the application of an electric field (E) introduces an energy contribution, which is different in case of parallel or antiparallel alignment of neighboring spins along the helix. The E field effect on the intra-chain exchange interaction J has been here experimentally observed by exploiting the sensitivity of Electron Paramagnetic Resonance (EPR) spectroscopy under electric field modulation. It is in fact well known that one-dimensional spin correlation can induce a significant g-shift even when only a weak anisotropy of dipolar origin is present. By replacing the usual B-field modulation with the E-field modulation an EPR signal is induced by the shift of the resonance as a result of the electric field effect on J. The symmetry of the observed phenomenon unambiguously confirms its magneto-chiral nature. Our observation opens interesting perspectives, which may be relevant also for the investigation of multiferroic materials.
*Italian MIUR (PRIN 2015 HYFSRT project), European QuantERA (SUMO project), and Fondazione CR Firenze.
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