Study of magnetic stuctures of surfaces and interfaces by X-ray diffraction

通过 X 射线衍射研究表面和界面的磁结构

• 批准号: 09304035
• 负责人: TAKAHASHI Toshio
• 金额: $ 26.11万
• 依托单位: Institute for Solid State Physics, University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A).
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09304035/
• 关键词: X-ray diffraction; surface; interface; magnetism; structure analysis

1. Instrumentation. We made an ultrahigh vacuum chamber equipped with a manipulator which has precise rotation axes, a sample heater and a sample cooler, two Knudsen cells, an RHEED unit and a LEED-Auger unit. We also made a cryostat equipped with a pair of magnets for X-ray measurement at low temperature.2.Characterization of metallic crystals. A lot of interesting magnetic structures appear in metallic thin films deposited on crystal substrates of different metals. Therefore we examined perfectibility of typical metallic crystals used for substrates, i.e. Ni, Au and Cu. The results of X-ray-rocking-curve measurement and X-ray topography verify that they canbe potentially used as substrates.3.Prepartion of a Si/Fe/Si(111) sample and measurement by synchrotron radiation. A Si/Fe/Si(111) sample was made by deposition of Fe atoms on a clean Si(111) surface followed by annealing and deposition of a Si cap layer. The sample was examined at Photon Factory (PF) by reflectivity method, diffraction-anomalous-fine-structure method and X-ray-standing-wave method. The result shows that an ideal Fe thin film is grown. Data analysis is continued to locate atoms at the interface precisely.4. Theory. We established a calculation method to determine an absolute value of X-ray scattering amplitude from a simple atomic layer and showed it is applicable to magnetic scattering. We also developed a new method of modelfree calculation for 3D distribution of magnetic electrons.Farther experiments using PF and Spring-8 are intended to develop this study

1. 仪器仪表。我们制作了一个超高真空室，配备了一个具有精确旋转轴的机械手、一个样品加热器和一个样品冷却器、两个努森池、一个 RHEED 单元和一个 LEED-Auger 单元。我们还制作了一个装有一对磁铁的低温恒温器，用于低温下的X射线测量。2.金属晶体的表征。许多有趣的磁性结构出现在沉积在不同金属的晶体基底上的金属薄膜中。因此，我们检查了用于基材的典型金属晶体（即镍、金和铜）的完美性。 X射线摇摆曲线测量和X射线形貌分析结果验证了它们可以用作衬底。3.Si/Fe/Si(111)样品的制备和同步辐射测量。 Si/Fe/Si(111) 样品是通过在干净的 Si(111) 表面上沉积 Fe 原子，然后退火并沉积 Si 盖层而制成的。样品在光子工厂 (PF) 通过反射率法、衍射异常精细结构法和 X 射线驻波法进行了检查。结果表明，生长出了理想的Fe薄膜。继续进行数据分析，精确定位界面处的原子。 4．理论。我们建立了一种计算方法来确定简单原子层的 X 射线散射振幅的绝对值，并表明它适用于磁散射。我们还开发了一种新的磁电子 3D 分布无模型计算方法。使用 PF 和 Spring-8 进行进一步的实验旨在开展这项研究

项目成果

T.Takahashi, K.Sumitani and S.Kusano: "Holographic imaging of surface atoms using surface X-ray diffraction"Surface Science. (To be published).

T.Takahashi、K.Sumitani 和 S.Kusano：“利用表面 X 射线衍射对表面原子进行全息成像”表面科学。

T.Takahashi et al.: "Effect of surface structure on crystal-truncation-rod scattering under the Bragg condition"Physical Review B. 62. 3630-3638 (2000)

T.Takahashi 等人：“布拉格条件下表面结构对晶体截断棒散射的影响”Physical Review B. 62. 3630-3638 (2000)

T.Takahashi et al.: "Holographic imaging of surface atoms using surface X-ray diffraction"Surface Science. (印刷中).

T. Takahashi 等人：“使用表面 X 射线衍射对表面原子进行全息成像”《表面科学》（正在出版）。

T.Takahashi, W.Yashiro, M.Takahasi, S.Kusano, X.W.Zhang and M.Ando: "Effect of surface structure on crystal-truncation-rod scattering under the Bragg condition"Physical Review B. 62. 3630-3638 (2000)

T.Takahashi、W.Yashiro、M.Takahasi、S.Kusano、X.W.Zhang 和 M.Ando：“布拉格条件下表面结构对晶体截断棒散射的影响”物理评论 B. 62. 3630-3638 (

T.Takahashi et al.: "Effect of surface structure on crystal-truncation-rod scattering under the Bragg condition"Phys.Rev.B. 62. 3630-3638 (2000)

T.Takahashi 等人：“布拉格条件下表面结构对晶体截断棒散射的影响”Phys.Rev.B。