Development of Study in Magnetism using 3rd Generation SR

1.利用第三代SRDamond相位板的明亮光源进行单色化X射线螺旋度快速反转实验，在SPring-8 BL 39 XU上成功建立了螺旋度调制方法，显著提高了X射线磁圆二色谱（XMCD）谱的准确度。在项目期间，我们研究了铁氧化物亚铁磁体的磁态、锰碳化物钙钛矿的磁相变、CeSb的变磁性以及Ho铁石榴石的高温磁态. SR实验中的合作我们在ESRF和SPring-8的SR实验中相互合作。1998年10月在ESRF上进行了Ce/Fe和CeLa/Fe多层膜的共振磁散射实验，1999年2月在SPring-8上进行了Ce/Fe和CeH/Fe多层膜的XMCD谱的温度依赖性实验。在此基础上讨论了层内和层间的磁结构.西奥 ...更多信息 自旋电子态的理论研究本文对3d-4f金属间化合物中稀土元素的L边XMCD谱进行了理论解释。考虑了4f-5d原子间交换作用、5d波函数收缩和3d-5d原子间相互作用，计算的光谱与实验结果吻合较好。本文还从对光谱中精细结构的影响的角度讨论了各种磁性材料中的固态效应。计算了Hubbard模型下的共振X射线发射谱，研究了电子关联效应.实验仪器的研制在8年春，在BL 39 XU上安装了最大10 T的超导磁体，成功地记录了高场低温下的XMCD谱。针对高压条件，设计并制作了一套由金刚石对顶砧和氦气闭式循环制冷机组成的系统。在高温下使用简化炉进行XMCD测量.研究人员的交流在项目期间，冈山和格勒诺布尔大学共有12名研究人员进行交流。在交流项目期间进行的讨论对于磁性领域以及SR仪器开发领域的合作伙伴来说非常富有成效。少

1. Experiments using brilliant light source of 3rd generation SRDiamond phase plate was applied to fast helicity reversal of the monochromatized X-ray, and the helicity-modulation method was successfully established at SPring-8 BL39XU.Accuracy of X-ray magnetic circular dichroism (XMCD) spectrum has been remarkably improved by this method. In the term of project, we have studied magnetic states in Fe-oxides ferrimagnets, magnetic phase transitions in Mn carbide perovskites, metamagnetism in CeSb, and magnetic states in Ho-iron-garnet at higher temperatures.2. Collaboration in SR experimentWe have collaborated with each other for SR experiments at ESRF and SPring-8. In October, 1998, resonant magnetic scattering in Ce/Fe and CeLa/Fe multilayers was made at ESRF, and in February, 1999, temperature dependence of XMCD spectrum in Ce/Fe and CeH/Fe multilayers was measured at SPring-8. The intra-layer and inter-layer magnetic structures were discussed on the basis of the observations.3. Theo … More retical study on spin-electronic statesTheoretical interpretation has been formulated on the L-edges XMCD spectrum of rare-earth (RE) elements in 3d-4f intermetallic compounds. The calculated spectrum well reproduced the experiment by taking into account 4f-5d intra-atomic exchange interaction, shrinkage of 5d wave function, and 3d-5d inter-atomic interaction. Solid-state effect in the various magnetic materials is also discussed from the view point of influence on fine structure in the spectrum. Resonant X-ray emission spectroscopy in Hubbard model was also calculated and electron correlation effect was studied.4. Development of experimental instrumentsA superconducting magnet with 10T maximum was installed on BL39XU in Spring-8, and the XMCD spectrum under high-field and low temperature was successfully recorded. For the condition of high-pressure, a system composed of a diamond-anvil-cell and a He-gas closed cycle refrigerator was designed and fabricated. A simplified furnace was used for the XMCD measurement at high temperatures.5. Exchange of researchersTwelve researchers have totally exchanged between Okayama and Grenoble universities in the term of project. The discussions which taken place during the exchange program were very fruitful for the partner in the field of magnetism as well as in the field of development of SR instrumentation. Less