The structure control of metal fine particle with micelle structure and the development of ferromagnet

我们建立了一个超高真空装置，在该装置中可以对MTP（Multiply Twnned Particle）超微粒生长过程中的结构、组成、成键状态和磁化过程进行“原位观察”。此外，我们还研制了一种新的双晶X射线谱仪，它与反射式高能电子衍射（RHEED）相结合。用该装置测量了Si（111）衬底上Fe薄膜的特征X射线FeK α，其分辨率可达~ 6.0eV，并研究了Fe、Nd和Fe-Nd合金生长过程中的结构和相应的磁化过程。通过RHEED分析发现，生长的Nd薄膜不是体相ABAC型hcp结构，而是面心立方结构。我们发现硫醇的最佳浓度 ...更多信息 为1.0×10 ~（-1）<-3>mol/l。我们观察到六角网络的MTP胶束的电子显微镜照片从胶束与最佳浓度的硫醇。观察到颗粒之间的间隙为1.12 μ m，相当于硫醇分子长度的2倍。我们发展了一种新的方法，即在稀有气体中溅射过程中，将细小颗粒凝结后的不同金属蒸气混合，制备出颗粒状磁性材料。应用该方法制备了Fe/Ag系Fe颗粒状磁性材料，研究了其磁性质，发现颗粒间存在磁力作用，磁性能可控，Fe薄膜在Rh（001）表面生长时形成面心立方结构。利用LEED对Fe薄膜生长过程中的结构进行了详细的研究，结果表明：Fe薄膜在生长到3层单层时呈面心立方结构，第4层晶格间距迅速减小，转变为bcc原始结构。少

We have constructed an ultra-high vacuum apparatus in which we can acheave "in situ observation" of the structures, compositions, bonding states and magnetization processes in the growing process of MTP (Multiply Twnnned Particle) ultrafine particle. Besides, we have developed a new double crystal X-ray spectrometer combined with RHEED (Reflection High Energy Electron Diffraction). Using the apparatus, we measured the charactristic X-ray FeK α which were emitted from Fe thin film on Si (111) and a high resolution of 〜6.0 eV was achieved.Using these apparatus, we studied the structures and the corresponding magnetization processes in the growth processes of Fe, Nd and Fe-Nd alloy. According to the RHEED analysis, we discovered that the structure of grown Nd film is not the bulk ABAC type hcp structure but fcc.We made "MTP nano micelle" by dissolving the evaporated Au/NaCl multi layer film in the thiol (β-mercaptopropionic acid) solution. We found that the optimum concentration of thiol … More was 〜1.0×10^<-3> mol/l. We observed hexagonal net works of the MTP micelle in the electron micrographs taken from the micelles made with optimum concentration of thiol. The observed gap beween the particles were 〜12Å which corresponds to the twice of the length of the thiole molecules.We have developed a new method to make the granuler magnetic material by mixing the different metal vapors after the condensation of fine particles in the sputtering process in the rare gas. Applying the method, we made Fe granuler magnetic material of Fe/Ag system and studied the magnetic natures and found that the magnetic force works between the particles and the magnetic property can be controlled.The fcc structure is formed when Fe thin film is grown on the Rh (001) surfece. We studied the structures in details in the growth process by LEED.The result was that the Fe film take fcc structure up to 3 monolayers and the lattice spacing of the 4th layer decreased quickly to transform to the bcc original structure. Less