Strong magneto-chiral dichroism in enantiopure chiral ferromagnets
Strong magneto-chiral dichroism in enantiopure chiral ferromagnets
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DOI：
10.1038/nmat2256
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发表时间：
2008-09-01
期刊：
影响因子：
41.2
通讯作者：
Verdaguer, Michel
中科院分区：
文献类型：
--
作者：
Train, Cyrille;Gheorghe, Ruxandra;Verdaguer, Michel
材料科学正朝着合成、研究和加工具有明确和复杂功能的新材料的方向发展，新型多功能材料的合成是材料科学面临的重要挑战之一。这些复杂的物理性质之一是磁手征二向色性，其在二阶时由材料中的空间不对称性和磁化的共存而产生。本文首次报道了对映体纯手性铁磁体的强磁手征二向色性。对映体纯的手性铁磁体的从头算合成是基于对映体选择性自组装，其中解析的手性季铵阳离子施加在铬锰二维草酸盐层内的金属中心的绝对构型。Cr（III）和Mn（II）离子之间的铁磁相互作用导致7 K的居里温度。当进入铁磁相时，磁手征二向色性效应增强了17倍。
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.