碳纳米管中局域磁矩间的间接交换耦合：动力学方法
Indirect exchange coupling between localized magnetic moments in carbon nanotubes: a dynamic approach
摘要：
分散在金属基质中的磁矩倾向于通过金属的传导电子耦合。这种间接交换耦合，已知发生在嵌入几种不同金属结构中的各种磁性材料中，是相当长的范围，特别是对于像碳纳米管这样的低维结构。最近的主张，磁矩之间的间接耦合在岁差运动有一个更长的范围比它的静态对应，在这里，我们考虑吸附到金属纳米管的壁的磁性原子如何响应于时间依赖的扰动，诱导其磁矩进动。通过计算频率依赖的自旋磁化率，我们能够识别共振峰，其各自的宽度提供有关的间接交换耦合的动态方面的信息。我们表明，通过从一个纯粹的静态表示离开另一个时刻被允许进动，我们改变从什么已经被认为是一个长距离的相互作用，另一个范围是远远优于。换句话说，当嵌入金属结构中的局部磁矩被设置为进动运动时，它们可以更容易地感觉到彼此的存在。我们认为，这样的效果可以有有用的应用程序，导致大规模的自旋电子器件。
英文摘要：
Magnetic moments dilutely dispersed in a metallic host tend to be coupled through the conduction electrons of the metal. This indirect exchange coupling, known to occur for a variety of magnetic materials embedded in several different metallic structures, is of rather long range, especially for low-dimensional structures like carbon nanotubes. Motivated by recent claims that the indirect coupling between magnetic moments in precessional motion has a much longer range than its static counterpart, here we consider how magnetic atoms adsorbed to the walls of a metallic nanotube respond to a time-dependent perturbation that induces their magnetic moments to precess. By calculating the frequency-dependent spin susceptibility we are able to identify resonant peaks whose respective widths provide information about the dynamic aspect of the indirect exchange coupling. We show that by departing from a purely static representation to another in which the moments are allowed to precess, we change from what is already considered a long range interaction to another whose range is far superior. In other words, localized magnetic moments embedded in a metallic structure can feel each other's presence more easily when they are set in precessional motion. We argue that such an effect can have useful applications leading to large-scale spintronics devices.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
