Preparation and properties of nano structured magnetic meterials disperced composite film

尺寸在100 nm到100 nm之间的多层薄膜和超细粉末因其具有大块晶体所不具备的许多有用的性质而受到材料科学领域的广泛关注。典型的例子是铁磁和亚铁磁性材料的矫顽力，其变化范围很大，取决于它们的颗粒尺寸。而氮化铁是一种极具吸引力的磁性材料，因为它具有较大的磁化强度和耐氧化性和耐水解性。因此，离子氮化物基复合材料，如多层膜和细颗粒分散膜，近年来作为高性能磁性材料以及金属基和氧化物基复合材料受到了人们的关注。采用射频溅射和离子注入的方法制备了Fe弥散的AlN和Si3N4薄膜，并在还原气氛中进行了后处理。我们还用射频溅射法制备了Fe/AlN多层膜。结构和界面…用X-射线衍射仪进行了更多的表征。穆斯堡尔谱、磁测量、X射线光电子能谱和分析电子显微镜。在此基础上，得到以下结论：α-Fe细小颗粒均匀地分散在非磁性基质中，α-Fe的粒度随退火温度和Fe含量的不同而不同，氮原子从Si3N4或AlN扩散到α-Fe中，磁化强度比α-Fe大20%。第一个系列是具有大磁矩的稀土金属氧基单氰胺。它们的晶体结构包括沿c轴堆积的Ln_2O_2层和层间的CN_&lt；2-&gt；^&lt；第二和第三系列是双金属氮化物。在A-M-N系(A：BA，Sr，Ca，M：V，Cr，Fe，Co，Ni)中，分别为Anin和A_3Mn_3。在ANIN中形成a-Ni-N-Ni-N线状链状结构，并在A_3Mn_3中形成Mn3^&lt；6-&gt；(M：V，Fe，Co)络合离子。ANIN和_3Mn_3的化合物在1000ﾟ℃下都比单一过渡金属氮化物MN(M：Fe，Co，Ni)的分解温度高得多。较少

Multilayred thin films and fine powders with few nm to 100nm size habe benn paied much attention in the field of material science because they exhibit various useful properties that bulk crystals don't show. The typical examples are observed for the coercive force of ferromagnetic and ferrimagnetic materials, which varies in the wide ranges depending on their particle size. While iron nitrides are attractive materials for magnetic applications because of both their large magnetization and there durabilities agaist oxidation and hydrolysis. Therfore, ion nitrides-base composites such as multilayred films and fine particle dispersed-films are recently interested as high functional magnetic materials as well as metal-and oxide-base composites.In the present investigation. Fe dispersed-AlN and Si_3N_4 films were prepared by rf-sputtering and ion implantation, followed by post annealing in reduced atmosphere. We also prepared Fe/AlN mutilayred films by rf-sputtering. Structural and interfac … More e characterizations were performed applying X-ray diffraction. Mossbauer spectroscopy, magnetic measurement, X-ray photoelectoron spectroscopy and analytical electron microscopy. On the basis of these charactarization, the following conclusions were obtainde ; alpha-Fe fine particles were homogeneously disperzed in the nonmagnetic matrixes, particle size of alpha-Fe varied depending on the annealing temperature and Fe content, and nitrogen atoms diffused in alpha-Fe from Si_3N_4 or AlN,resulting in larger magnetization by 20% than alpha-Fe.Three new series of compounds other than iron nitrides were synthesized. The first series are oxymonocyanamids of rare earth metals with large magnetic moment. Their crystal structure consists of Ln_2O_2 layr stacking along the c-axis and CN_<2->^<2-> ions in the interlayr. The second and third series are double metal nitrides. ANiN and A_3MN_3, in the A-M-N systems (A : Ba, Sr, Ca, M : V,Cr, Fe, Co, Ni), respectively. In ANiN a-Ni-N-Ni-N linear chain is formed, and MN_3^<6-> (M : V,Fe, Co) complex ions in A_3MN_3. Both compounds of ANiN and _3MN_3 are stable at much higher temperature as 1000ﾟC than decomposition temperatures of single transition metal nitrides MN(M : Fe, Co, Ni). Less