Magnetic behavior in metal-free radical thin films
Magnetic behavior in metal-free radical thin films
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DOI：
10.1016/j.chempr.2021.11.021
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发表时间：
2022-03-10
期刊：
影响因子：
23.5
通讯作者：
Casu, Maria Benedetta
中科院分区：
文献类型：
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作者：
Junghoefer, Tobias;Calzolari, Arrigo;Casu, Maria Benedetta
有机材料中的磁性是非常有趣的：在完全无金属的系统中实现长程磁有序将磁矩与有机材料的有用性质结合起来。应用程序的一个重要步骤是磁行为的知识，到目前为止，只研究了轻原子与重金属，杂质或空位的接近程度，而不是作为纯有机薄膜的固有特性。在这里，我们解开在纯有机自由基薄膜的碳和氮的K-边缘的X射线磁性圆二色性。我们的研究结果表明，控制制备，磁行为是不同于单晶。原子模拟表明，与单晶中的分子排列相比，薄膜中的分子排列是造成这种情况的原因。通过分子排列来调节薄膜的磁性是揭示新的性质和应用的一个令人兴奋的观点。
Magnetism in organic materials is very intriguing: the realization of long-range magnetic order in completely metal-free systems combines magnetic moments with useful properties of organic materials. An essential step for applications is the knowledge of the magnetic behavior that, so far, was investigated only in the proximity of light atoms to heavy metals, impurities, or vacancies, and not as an intrinsic property of thin films that are purely organic. Here, we unravel X-ray magnetic circular dichroism at the carbon and nitrogen K-edges in purely organic radical thin films. Our results show that, controlling the preparation, the magnetic behavior is different than in single crystals. Atomistic simulations indicate that the reason for this is the molecular arrangement in the films when compared with that in the single crystal. The tuning of the film magnetic properties by the molecular arrangement is an exciting perspective toward revealing new properties and applications.