Magneto-Seebeck Tunneling Across a Vacuum Barrier

该项目的主要挑战将是在超高真空条件下实现“磁-塞贝克扫描隧道显微镜”(“磁-塞贝克扫描隧道显微镜”)的实验装置，以便详细研究和了解磁-塞贝克隧道所涉及的微观细节。聚焦一束激光，我们只会非常局部地加热自旋极化扫描隧道显微镜的探头尖端，而系统的其余部分(特别是样品)不会受到外部加热的影响。这种选择性加热将在磁性探头尖端和磁性样品之间产生限定的温降。利用这种新的方法，我们将研究磁性STM针尖通过真空势垒进入单个纳米磁体的磁塞贝克隧道效应，并从声子隧道效应和由于热自旋转移扭矩引起的定向开关方面阐述非弹性效应。

The main challenge of this project will be the realization of an experimental setup for a "magneto-Seebeck scanning tunneling microscope" ("magneto-Seebeck STM") under ultra-high vacuum conditions that allows for a detailed study and understanding of the microscopic details involved in the magneto-Seebeck tunneling. Focusing a laser beam we will only heat the probe tip of a spin-polarized STM very locally, leaving the rest of the system (especially the sample) unaffected by the external heating. This selective heating will generate a defined temperature drop between the magnetic probe tip and the magnetic sample. Using this new approach we will study the magneto-Seebeck tunneling from a magnetic STM tip through a vacuum barrier into an individual nanomagnet and elaborate inelastic effects in terms of phonon tunneling and directed switching due to thermal spin-transfer torque.