Atomic-scale skyrmions driven by lateral spin-polarized currents

由横向自旋极化电流驱动的原子尺度斯格明子

• 批准号: 403505835
• 负责人: Dr. Stefan Krause
• 金额: --
• 依托单位: Institut für Nanostruktur- und Festkörperphysik (INF)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/403505835?language=en
• 关键词: Atomic; scale; skyrmions; driven; lateral

Within this project we aim at the experimental investigation of atomic-scale skyrmions interacting with lateral spin-polarized surface currents using multi-probe spin-polarized scanning tunneling microscopy (SP-STM). We will focus on skyrmions that are stabilized by Dzyaloshinskii-Moriya interactions at the interface between ultrathin magnetic films consisting of only a few atomic layers prepared by epitaxial growth on heavy-element single crystal surfaces. Two of the scanning probe tips will be used as contacts for the controlled generation of a local spin-polarized current within a magnetic stripe. Skyrmion lattices and individual skyrmions affected by the lateral spin-polarized current will be investigated in real-space by means of SP-STM, using a tunneling magnetic probe tip that is positioned between the contact tips. The experiments will be performed under ultrahigh vacuum conditions, at variable temperature between 1 K and 100 K (and ultimately up to room temperature), and in variable external magnetic fields of up to 3 T. Samples will be prepared in vacuo, thereby realizing high purity magnetic ultrathin films as well as well-defined homogeneous interfaces between the magnetic film and the substrate.

在这个项目中，我们的目标是使用多探针自旋偏振扫描隧道显微镜（SP-STM）对原子级斯格明子与横向自旋偏振表面电流相互作用进行实验研究。我们将重点关注通过在超薄磁膜之间的界面处的 Dzyaloshinskii-Moriya 相互作用来稳定的斯格明子，该磁膜仅由在重元素单晶表面上外延生长制备的几个原子层组成。两个扫描探针尖端将用作触点，以控制磁条内局部自旋极化电流的生成。将使用位于接触尖端之间的隧道磁性探针尖端，通过 SP-STM 在真实空间中研究受横向自旋极化电流影响的斯格明子晶格和单个斯格明子。实验将在超高真空条件下、1 K 至 100 K 之间的可变温度（最终达到室温）以及高达 3 T 的可变外部磁场中进行。样品将在真空中制备，从而实现高真空度。纯度磁性超薄膜以及磁性薄膜和基底之间明确的均匀界面。