A four-coordinate cobalt(II) single-ion magnet with coercivity and a very high energy barrier.
A four-coordinate cobalt(II) single-ion magnet with coercivity and a very high energy barrier.
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DOI：
10.1038/ncomms10467
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发表时间：
2016-02-17
影响因子：
16.6
通讯作者：
van Slageren J
中科院分区：
文献类型：
--
作者：
Rechkemmer Y;Breitgoff FD;van der Meer M;Atanasov M;Hakl M;Orlita M;Neugebauer P;Neese F;Sarkar B;van Slageren J
单分子磁体显示分子起源的磁双稳态，这可能有一天会被开发用于磁数据存储设备。最近人们认识到，增加多核分子的磁矩并不会自动导致磁双稳态的大幅增加。因此，人们越来越多地关注具有大磁各向异性的离子，特别是镧系元素。尽管磁矩的弛豫存在很大的有效能垒，但到目前为止，这并没有导致磁双稳性的大幅增加。在这里，我们提出了一个全面的研究单核，四面体协调的钴（II）单分子磁体，它具有非常高的有效能垒，并显示出明显的磁双稳态。结合实验和理论的方法，使深入了解这些有利的性能，这是由一个强大的配位场与轴向畸变相结合的起源。我们的研究结果可以制定明确的设计原则，改进材料。 双稳态单分子磁体可能允许极高密度的信息存储。在这里，作者研究了空气和水分稳定的单核四面体钴（II）配合物，阐明了其明显的磁双稳态的起源。
Single-molecule magnets display magnetic bistability of molecular origin, which may one day be exploited in magnetic data storage devices. Recently it was realised that increasing the magnetic moment of polynuclear molecules does not automatically lead to a substantial increase in magnetic bistability. Attention has thus increasingly focussed on ions with large magnetic anisotropies, especially lanthanides. In spite of large effective energy barriers towards relaxation of the magnetic moment, this has so far not led to a big increase in magnetic bistability. Here we present a comprehensive study of a mononuclear, tetrahedrally coordinated cobalt(II) single-molecule magnet, which has a very high effective energy barrier and displays pronounced magnetic bistability. The combined experimental-theoretical approach enables an in-depth understanding of the origin of these favourable properties, which are shown to arise from a strong ligand field in combination with axial distortion. Our findings allow formulation of clear design principles for improved materials. Bistable single-molecule magnets potentially allow information storage at extremely high densities. Here, the authors study an air- and moisture-stable mononuclear tetrahedral cobalt(II) complex, elucidating the origin of its pronounced magnetic bistability.