Spin Polarized Electron Spectroscopic Studies of Magnetic Materials

磁性材料的自旋极化电子能谱研究

• 批准号: 9119815
• 负责人: Herbert Hopster
• 金额: $ 35万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-05-01 至 1995-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9119815&HistoricalAwards=false
• 关键词: Spin; Polarized; Electron; Spectroscopic; Studies

Spin-dependent elastic and inelastic electron scattering will be used to study the magnetism at surfaces and in ultra-thin films. The spin-dependence of inelastic scattering in localized magnetic moment systems (3d transition metal oxides and rare earth materials) will be studied by spin polarized electron energy loss spectroscopy. The energy resolution will be improved by employing a new spin detector in order to reach the energy range of collective magnetic excitations. The spin-dependent attenuation of electron through ultra-thin ferromagnetic overlayers will be studied by spin polarized photoemission spectroscopy. The structure and magnetization for ultra-thin films will be studied by combining quantitative LEED and SPLEED analysis and polarized secondary emission spectroscopy on ultra-thin films. Spin polarized LEED measurements will be compared to state-of-the-art theoretical calculations, thereby allowing a simultaneous investigation of the geometric and magnetic structure of the films.

自旋相关的弹性和非弹性电子散射将被用来研究表面和超薄膜中的磁性。利用自旋极化电子能量损失谱研究了局域磁矩系统(3d过渡金属氧化物和稀土材料)中非弹性散射的自旋依赖性。采用一种新的自旋探测器将提高能量分辨率，以达到集体磁激发的能量范围。用自旋偏振光电子能谱研究超薄铁磁薄膜中电子的自旋相关衰减。结合LEED和SPLEED的定量分析和超薄膜的偏振二次发射光谱，研究了超薄膜的结构和磁化强度。自旋极化的LEED测量将与最先进的理论计算进行比较，从而可以同时研究薄膜的几何结构和磁性结构。