Separation of the Spin Pumping From the Gilbert Damping by In Situ Investigations and Optically Modified Spin Pumping

通过原位研究和光学修改自旋泵浦将自旋泵浦与吉尔伯特阻尼分离

• 批准号: 321725013
• 负责人: Dr. Florian M. Römer
• 金额: --
• 依托单位: CENIDE - Center for Nanointegration
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/321725013?language=en
• 关键词: Separation; Spin; Pumping; Gilbert; Damping

Different damping contributions of the volume and interface on the magnetization dynamics will be separated by in situ investigation of epitaxial hetero structures. The spin pumping contribution of epitaxial Fe/GaAs(110) shall be investigated for the different main crystallographic directions. For (110) films all main directions lay within one film plane and are therefore easy accessible. Uncapped thin films in the range of 1-20 nm will be investigated to determine and separate the different relaxation processes (Gilbert damping, inhomogeneous damping, spin pumping). This will be done by in situ thickness dependent measurements of capped and uncapped film using the exactly same sample. The different contributions of the interface damping substrate-film and film-capping will be separated for the first time under consideration of all damping contributions. The spin pumping will be correlated to the substrate parameters like doping and creating and ohmic or Schottky like contact.Additionally the influence of circular polarized IR light will be investigated by means of wavelength, polarization, helicity, intensity and angle between the magnetization and laser light.

不同的阻尼贡献的体积和界面上的磁化动力学将被分离的外延异质结构的原位调查。研究了Fe/GaAs（110）外延层在不同主晶向下的自旋抽运贡献。对于（110）膜，所有的主方向都在一个膜平面内，因此容易接近。将研究在1-20 nm范围内的无帽薄膜，以确定和分离不同的弛豫过程（吉尔伯特阻尼、非均匀阻尼、自旋泵浦）。这将通过使用完全相同的样品对加盖和未加盖的膜进行原位厚度相关测量来完成。在综合考虑所有阻尼贡献的基础上，首次将界面阻尼基底膜和膜盖的不同贡献分离开来。自旋抽运将与衬底参数如掺杂和产生欧姆或肖特基接触等相关，此外还将通过波长、偏振、螺旋度、强度和磁化与激光之间的角度来研究圆偏振红外光的影响。