Article abstract
Nature Materials 7, 729 - 734 (2008)
Published online: 17 August 2008 | doi:10.1038/nmat2256
Subject Categories: Optical, photonic and optoelectronic materials | Magnetic materials | Design synthesis and processing
Strong magneto-chiral dichroism in enantiopure chiral ferromagnets
Cyrille Train1, Ruxandra Gheorghe1, Vojislav Krstic2,3, Lise-Marie Chamoreau1, Nikolai S. Ovanesyan4, Geert L. J. A. Rikken3, Michel Gruselle1 & Michel Verdaguer1
Abstract
As materials science is moving towards the synthesis, the study and the processing of new materials exhibiting well-defined and complex functions, the synthesis of new multifunctional materials is one of the important challenges. One of these complex physical properties is magneto-chiral dichroism which arises, at second order, from the coexistence of spatial asymmetry and magnetization in a material. Herein we report the first measurement of strong magneto-chiral dichroism in an enantiopure chiral ferromagnet. The ab initio synthesis of the enantiopure chiral ferromagnet is based on an enantioselective self-assembly, where a resolved chiral quaternary ammonium cation imposes the absolute configurations of the metal centres within chromium–manganese two-dimensional oxalate layers. The ferromagnetic interaction between Cr(III) and Mn(II) ions leads to a Curie temperature of 7 K. The magneto-chiral dichroic effect is enhanced by a factor of 17 when entering into the ferromagnetic phase.
- Laboratoire de Chimie Inorganique et Matériaux Moléculaires, UMR 7071, IFR 2769, UPMC, case 42, 4 place Jussieu, F-75252 Paris cedex 05, France
- Trinity College Dublin, Centre for Research on Adaptive Nanostructures and Nanodevices, Dublin 2, Ireland
- Laboratoire National des Champs Magnétiques Pulsés, CNRS/INSA/UPS, B.P. 14245, F-31400 Toulouse, France
- Institute of Problems of Chemical Physics, Russian Academy of Science, Moscow Region, 142432 Chernogolovka, Russia
Correspondence to: Cyrille Train1 e-mail: cyrille.train@upmc.fr
Correspondence to: Michel Gruselle1 e-mail: michel.gruselle@upmc.fr
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