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Nat Mater. 2008 Sep;7(9):729-34. doi: 10.1038/nmat2256.

Strong magneto-chiral dichroism in enantiopure chiral ferromagnets.

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Laboratoire de Chimie Inorganique et Matériaux Moléculaires, UMR 7071, IFR 2769, UPMC, case 42, 4 place Jussieu, F-75252 Paris cedex 05, France.


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.


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