中文

具有高热稳定性的自旋分子界面的铁磁与反铁磁耦合

材料科学 2018-10-16 v1

摘要

我们报道了一种具有室温磁滞回的先进有机自旋界面结构,由金属酞菁分子通过石墨烯介导与 Co 层磁耦合构成。组装于石墨烯/Co 上的 Fe- 和 Cu-酞菁具有相同的结构构型,但 FePc 与 Co 在直至室温下均呈反铁磁耦合,而 CuPc 呈铁磁耦合,其耦合与热稳定性较弱,这由元素选择性的 X 射线磁圆二色信号推断得出。稳健的反铁磁耦合由超交换相互作用稳定,该作用由负责磁基态且通过石墨烯层与底层金属电子解耦的平面外分子轨道驱动,如 ab initio 理论预测所证实。这些原型自旋界面可作为原型,展示如何通过选择分子轨道对称性来优化反铁磁和/或铁磁耦合。

关键词

引用

@article{arxiv.1810.06317,
  title  = {Ferromagnetic and Antiferromagnetic Coupling of Spin Molecular Interfaces with High Thermal Stability},
  author = {Giulia Avvisati and Claudia Cardoso and Daniele Varsano and Andrea Ferretti and Pierluigi Gargiani and Maria Grazia Betti},
  journal= {arXiv preprint arXiv:1810.06317},
  year   = {2018}
}

备注

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano. Lett. copyright American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acs.nanolett.7b04836