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

我们构建了一种超高真空装置，可以对MTP （Multiply twnned Particle）超细粒子生长过程中的结构、成分、键合状态和磁化过程进行“原位观察”。此外，我们还开发了一种新的双晶x射线光谱仪，结合了RHEED（反射高能电子衍射）。利用该仪器测量了Si（111）上Fe薄膜发射的特征x射线FeK α，获得了~ 6.0 eV的高分辨率。利用这些装置，我们研究了Fe、Nd和Fe-Nd合金生长过程中的结构和相应的磁化过程。根据RHEED分析，我们发现生长Nd膜的结构不是ABAC型hcp结构，而是fcc结构。将蒸发后的Au/NaCl多层膜溶解在巯基丙酸溶液中制备“MTP纳米胶束”。我们发现硫醇…More的最佳浓度为~ 1.0×10^<-3> mol/l。在电子显微照片中，我们观察到MTP胶束的六边形网状结构，这些胶束是由最佳硫醇浓度制成的。观察到粒子间的间隙为~ 12Å，对应于巯基分子长度的两倍。本文提出了一种在稀有气体中溅射过程中细颗粒凝结后，将不同的金属蒸气混合制成粒状磁性材料的新方法。应用该方法制备了Fe/Ag体系的铁粒磁性材料，并对其磁性性质进行了研究，发现颗粒间的磁力相互作用，磁性能是可控的。在Rh（001）表面生长Fe薄膜形成fcc结构。我们通过LEED对生长过程中的结构进行了详细的研究。结果表明，Fe膜呈fcc结构，最高可达3层，第4层晶格间距迅速减小，向bcc原始结构转变。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