Magneto-optic effect and its application for metals in γ-ray wavelength region

穆斯堡尔谱学观测到原子核对伽马射线的无反冲共振吸收，从而有可能以10 ^ eV的超高能量分辨率确定原子核的能级细节<-9><57>。因此，我们有可能研究原子核与原子电子系统之间10^ eV量级的超精细相互作用的细节<-7>。穆斯堡尔谱从超精细相互作用参数出发，可以提供微观上材料电子系统的细节。特别是超精细磁场可以解释材料的局域磁性，穆斯堡尔谱所获得的超精细相互作用信息提供了所谓的高温氧化物超导体、准晶体材料、人工多层膜和纳米金属颗粒的物理和化学性质。此外，由于其超高的能量（频率）分辨率，当相位变化依赖于时间时，可以从微小的频移测量由于放置在伽马射线源和吸收体之间的发射器的折射率引起的伽马射线相位变化。在这种情况下，源核和吸收核都发生简并。而非磁偶极简并的原子核也能发射出极化的伽玛射线，这取决于磁场的方向和传播方向。利用这种偏振的伽玛射线，可以测量伽玛射线波长范围内的磁光效应。在本研究中，发展了相位调制穆斯堡尔谱学、偏振伽玛射线谱学和线偏振同步辐射共振散射谱。

Mossbauer spectroscopy observes recoilless resonant absorption of ganma-ray by nucleus, and it is posiible to determine the details of the nuclear energy level with an ultra-high energy resolution like a lO^<-9> eV in the case of ^<57>Fe nucleus. Therefore, it is possible to examine the details of the hyperfine interactions between nucleus and atomic electron system, which is 10^<-7> eV order. From the hyperfine interaction parameters, the Mossbaue spectroscopy can offer the detailes of the electron system of materials microscopically. Especially, the local magnetism in materials is possible to elucidate from the hyperfine magnetic field and the informations through the hyperfine interactions obtained from Mossbauer spectroscopy have offered the physical and chemical properties of so-called high-Tc oxides superconductor, quasi-cristalline materials, artificial multilayers and nano-meter sized metallic particles. Furthermore, the ganma-ray phase change due to the refractive index of the transmitter placed between ganma-ray source and absorber can be measured from the small frequenchy shifts when the phase change depends on the time, because of its ultra-high energy (frequency) resolution. In this case, both of source and absorber nuclei degenerates. However, the nucleus non-degenerated by magnetic dipole interaction can emitted the polarized ganma-ray depending on the direction of the magnetic field and the propagation direction. Using this polarized ganma-ray, it is posiible to measure the magneto-optic effect in wavelength range of ganma-ray. In this investigation, the phase modulation Mossbauer spectroscopy, spectroscopy using a polarized ganma-ray and the nuclear resonant scattering with linearly polarized synchrotron radiation have been developed.