Di Maiolo Francesco, Sissa Cristina, Painelli Anna
Dipartimento di Chimica, Università di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy.
Sci Rep. 2016 Jan 21;6:19682. doi: 10.1038/srep19682.
Organic ferroelectric materials are currently a hot research topic, with mixed stack charge transfer crystals playing a prominent role with their large, electronic-in-origin polarization and the possibility to tune the transition temperature down to the quantum limit and/or to drive the ferroelectric transition via an optical stimulus. By contrast, and in spite of an impressive research effort, organic ferromagnets are rare and characterized by very low transition temperatures. Coexisting magnetic and electric orders in multiferroics offer the possibility to control magnetic (electric) properties by an applied electric (magnetic) field with impressive technological potential. Only few examples of multiferroics are known today, based on inorganics materials. Here we demonstrate that, by decorating mixed stack charge transfer crystals with organic radicals, a new family of robust molecular ferromagnets can be designed, stable up to ambient temperature, and with a clear tendency towards multiferroic behaviour.
有机铁电材料目前是一个热门的研究课题，混合堆叠电荷转移晶体凭借其源自电子的大极化以及将转变温度调节至量子极限和/或通过光刺激驱动铁电转变的可能性而发挥着突出作用。相比之下，尽管进行了大量的研究工作，但有机铁磁体却很罕见，且具有非常低的转变温度。多铁性材料中并存的磁序和电序提供了通过施加电场（磁场）来控制磁（电）性质的可能性，具有令人瞩目的技术潜力。目前已知的基于无机材料的多铁性材料实例很少。在此我们证明，通过用有机自由基修饰混合堆叠电荷转移晶体，可以设计出一类新的坚固分子铁磁体，其在室温下稳定，并且明显倾向于表现出多铁性行为。
