Exfoliated two-dimensional ferromagnets probed by spin polarized scanning tunneling microscopy and photoelectron spectroscopy

通过自旋偏振扫描隧道显微镜和光电子能谱探测剥离的二维铁磁体

• 批准号: 436834725
• 负责人: Professor Dr. Markus Morgenstern
• 金额: --
• 依托单位: PGI-6: Elektronische Eigenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/436834725?language=en
• 关键词: Exfoliated; two; dimensional; ferromagnets; probed

This project employs surface science techniques such as spin polarized scanning tunneling spectroscopy, spin polarized angular photoelectron spectroscopy and spin-polarized photoelectron microscopy to study the properties of van-der-Waals type two-dimensional ferro- and antiferromagnets prepared by exfoliation. The atomically thin flakes (CrBr3, Fe3GeTe2,...) are exfoliated in a glove box and transferred in ultrahigh vacuum within the dark to the measurement setups. This avoids oxidation that occurs rapidly at ambient conditions. By mapping the spin-polarised band structure, imaging domain patterns, and probing the spin-polarized local density of states, we firstly tackle open issues resulting from the pioneering experiments such as the origin of the demonstrated gate tuning of the magnetic properties. Additionally, we aim to experimentally establish tunable versions of theoretically well-studied magnetic 2D models such as Heisenberg, Ising or XY model aiming, e.g., at a direct imaging of vortex/antivortex-type excitations.

本计画利用自旋极化扫描穿隧能谱、自旋极化角光电子能谱及自旋极化光电子显微镜等表面科学技术，研究以剥离法制备的范德华型二维铁磁体及反铁磁体的性质。原子级薄片（CrBr 3、Fe 3GeTe 2、.）在手套箱中剥离，并在黑暗中在真空中转移到测量装置中。这避免了在环境条件下快速发生的氧化。通过映射的自旋极化能带结构，成像域图案，并探测自旋极化的局域态密度，我们首先解决了开放的问题，从开创性的实验，如证明门调谐的磁性的起源。此外，我们的目标是通过实验建立理论上研究得很好的磁性2D模型的可调版本，例如海森堡，伊辛或XY模型瞄准，例如，在涡旋/反涡旋型激励的直接成像。