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STM”）的实验设置，以便详细研究和了解磁-塞贝克隧道中涉及的微观细节。聚焦激光束，我们将只加热自旋极化STM的探针尖端，而系统的其余部分（特别是样品）不受外部加热的影响。这种选择性加热将在磁性探针尖端和磁性样品之间产生一个确定的温度下降。利用这种新方法，我们将研究从磁性STM尖端穿过真空势垒进入单个纳米磁体的磁-塞贝克隧穿，并详细阐述由于热自旋传递扭矩而引起的声子隧穿和定向开关方面的非弹性效应。

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.