论文标题
通过分子表面键合修改低维铁磁铁的电荷和磁性
Modification of the charge and magnetic order of a low dimensional ferromagnet by molecule-surface bonding
论文作者
论文摘要
在分子尺度上设计和控制低维材料的自旋和电荷顺序的能力为旋转型技术朝纳米尺度的微型化提供了有趣的途径。在这项工作中，我们专注于在原型有机分子perylene-3,4,9,4,9,4,9,10-四核二羧基二氢化乙母（PTCDA）吸附后，低尺寸铁磁表面合金的磁性和电子性能的增添修饰。对于这种金属有机界面，我们观察到功能分子基和表面合金原子之间的局部$σ$样键的形成。这种牢固的化学键合与特征表面合金带结构的提升以及将Dy原子的局部磁矩的大小减少了18％。我们将这两个发现都归因于自旋脱位分子态与Dy-Ag表面合金的自旋分解状态的混合，这两个发现通过PTCDA和DY表面合金原子之间的Sigma样键。我们的发现清楚地证明了量身定制的分子表面sigma键的潜力，不仅可以控制电子材料的磁性，还可以控制低维材料的磁序。
The ability to design and control the spin and charge order of low dimensional materials on the molecular scale offers an intriguing pathway towards the miniaturization of spintronic technology towards the nanometer scale. In this work, we focus on the adsorption induced modifications of the magnetic and electronic properties of a low dimensional ferromagnetic surface alloy after the adsorption of the prototypical organic molecule perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA). For this metal-organic interface, we observe the formation of a localized $σ$-like bond between the functional molecular groups and the surface alloy atoms. This strong chemical bonding coincides with a lifting of the characteristic surface alloy band structure and a reduction of the magnitude of the local magnetic moments of the Dy atoms by 18%. We attribute both findings to a mixing of spin-degenerate molecular states with spin-split states of the Dy-Ag surface alloy via the sigma-like bonds between PTCDA and the Dy surface alloy atoms. Our findings clearly demonstrate the potential of tailored molecule-surface sigma-bonds to control not only the electronic but also the magnetic order of low dimensional materials.
