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Surface and Interface Magnetism Studied by Spin Polarized Light and Electrons

通过自旋偏振光和电子研究表面和界面磁性

基本信息

批准号：
03452042
负责人：
SUGA Shigemasa
金额：
$ 0.64万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452042/
关键词：
Spin Polarized Electrons Photoemission Inverse Photoemission Magnetic Circular Dichroism MCD Spin Exchange Splitting Surface Magnetism Interface Magnetism 超薄模磁性体

项目摘要

1: Development of a spin polarized electron gun A p-type GaAs single crystal was cleaned by Ar ion beam sputtering and then annealed in ultra-high vacuum of 10^<-10> Torr. Small amount of Cs was deposited onto it. Subsequent O_2 exposure realized a stable NEA(negative electron affinity) photo-cathode. The photoexcitation was done by a semiconductor laser. Life time(1/e) of the NEA cathode was about two hours after the Cs evaporation and the O_2 exposure was stopped at 20muA.2: An electron spin analyzer of the diffuse scattering type by use of a Au thin film is manufactured. The asymmetry of the scattered beam is going to be detected by 4 independent Ceratrons. As an energy analyzer in front of the spin analyzer, we use a Jost type analyzer.3: Magnetic thin film sample: We are now growing single crystal of Fe on Ag thin film grown onto Si(111) substrate. Magnetic circular dichroism measurement of the photoemission intensity and angular distribution by use of circularly polarized synchrotron radiation is under way at photon Factory.4. Measurement of the exchange splitting of the 3d, 3s states were done on Mn_2Sb and MnAlGe. Inverse photoemission was fully employed for the measurement of the 3d state.. Magnetic circular dichroism measurement of Mn 2p core states in the above Mn compounds was successfully done providing the different contributions of nonequivalent Mn sites.

1：自旋极化电子枪的研制通过Ar离子束溅射对p型GaAs单晶进行清洗，然后在10^-10Torr的超高真空中进行退火。少量的Cs沉积在其上。随后的O_2曝光实现了稳定的NEA（负电子亲和力）光电阴极。光激发是通过半导体激光器完成的。 NEA阴极的寿命(1/e)在Cs蒸发后约2小时，并且O_2暴露在20μA停止。2：制造利用Au薄膜的漫散射型电子自旋分析仪。散射光束的不对称性将由 4 个独立的 Ceratron 进行检测。作为自旋分析仪前面的能量分析仪，我们使用 Jost 型分析仪。3：磁性薄膜样品：我们现在在 Si(111) 衬底上生长的 Ag 薄膜上生长 Fe 单晶。光子工厂正在利用圆偏振同步加速器辐射对光电发射强度和角分布进行磁圆二色性测量。4．对 Mn_2Sb 和 MnAlGe 进行了 3d、3s 态交换分裂的测量。逆光电发射被充分用于3d态的测量。上述Mn化合物中Mn 2p核态的磁圆二色性测量已成功完成，提供了非等价Mn位点的不同贡献。