Short range Ordering, Nano-Structure and Unique Properties in Highly Concentrated Random Alloys

高浓度随机合金的短程有序、纳米结构和独特性能

• 批准号: 08405043
• 负责人: SUZUKI Kenji
• 金额: $ 25.92万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08405043/
• 关键词: random alloy; nano-crystalline material; granular material; sputtering; magnetization; electrical conductivity; Mossbauer effect; transmission electron microscopy; 鉄-クロム-窒素; 非平衡合金; ナノ構造; 垂直磁化膜

In this project, we produced highly random systems mainly using a facing target-type sputtering. We studied the chemical, structural and morphological fluctuation, and the nano-granular particle formation in these systems as functions of deposition conditions and subsequent annealing, and their contibution to the magnetic and electrical properties. The following are the outlines.1) For Fe-Cr-N alloy films with good perpendicular anisotropy, the magnetic torque, ferromagnetic resonance and Mossbauer effect were observed to understand microscopic fluctuations in the magnetism and structures. The chemical bonding states were analyzed by the X-ray photoemission spectra. Combining these results with the X-ray diffraction and transmission electron microscope (TEM) observations, we can ascribe the perpendicular magnetic anisotropy to the complex structure of these films : the aciculate alpha-Fe crystallites growing perpendicular to the film plane are finely dispersed along the grain boundarie … More s of the columnar gamma- (FeCr) _4N crystals whose (200) reciprocal lattice vector is perpendicular to the film plane.2) The TEM micrographes, magnetization and electrical resistivity were observed for Co-C films. An amorphouslike Co-C phase is obtained when the substrate temperature, T_s is lower than 300ﾟC,while the Co particles of about 20nm in diameter are formed and surrouned by C (graphite) boundaries at T_s-350ﾟC,revealing a granular structure, and the phase separation is more pronounced at T_s>400ﾟC.A rather large magnetic coercive force of about 500 Oe is detected for Co_<50>C_<50> film made at T_s-350ﾟC.3) The meta-magnetic transition accompanying by the sign change of magnetoresistance was detected at low temperature for Eu-Fe random alloys produced by thermal evaporation. In Fe-Cu granular films produced by a ionized cluster beam method, moreover, the structure of Fe clusters in Cu matrices varies from fcc to bcc with increasing the Fe content and there is a hierarchy in the magnetic states of Fe clusters. Less

在这个项目中，我们主要使用对向靶型溅射来生产高度随机的系统。我们研究了化学，结构和形态的波动，和纳米颗粒的形成在这些系统中作为功能的沉积条件和随后的退火，以及它们的contribution的磁性和电学性能。1）对于具有良好垂直各向异性的Fe-Cr-N合金薄膜，通过观察磁矩、铁磁共振和穆斯堡尔效应，了解其微观磁性和结构的涨落。用X射线光电子能谱分析了化合物的化学键合状态。结合X射线衍射和透射电子显微镜（TEM）的观察，我们认为这种垂直磁各向异性是由薄膜的复杂结构引起的：垂直于薄膜平面生长的针状α-Fe微晶沿着晶界弥散分布 ...更多信息 2）观察了Co-C薄膜的TEM形貌、磁化强度和电阻率。当衬底温度T_s低于300 ℃时，得到类非晶Co-C相，而在T_s-350 ℃时，形成直径约20 nm的Co颗粒，并被C（石墨）晶界包裹，呈颗粒状结构，当T_s&gt;400 ℃时，相分离更加明显。在T_s下制备的Co_ C_2膜具有约500 Oe的较大矫顽力<50><50>s-350 &lt;$C. 3）在低温下，热蒸发制备的Eu-Fe无序合金样品中出现了亚磁性转变，并伴随着磁阻的符号变化.在用团簇离子束方法制备的Fe-Cu颗粒膜中，随着Fe含量的增加，Fe团簇在Cu基体中的结构由fcc向bcc变化，并且Fe团簇的磁状态存在层次结构。少

项目成果

K.Wakoh: "Comparative GMR Study of Fe/Cu Granular Films Deposited by Co-Evapopration and Cluster Beam Techniques" Mat,Sci.Eng.A217/218. 326-330 (1996)

K.Wakoh：“共蒸发和簇束技术沉积的 Fe/Cu 颗粒薄膜的 GMR 比较研究”Mat，Sci.Eng.A217/218。

T.Hihara: "Microtructure and Magnetoresisance in Fe-Cu Granular Films Prepared by Sputter Deposition and Subsequet Annealing" J.Phys.soc.Jpn.66. 1785-1791 (1997)

T.Hihara：“通过溅射沉积和后续退火制备的 Fe-Cu 颗粒薄膜的微观结构和磁阻”J.Phys.soc.Jpn.66。

T.Hihara: "Size Distribution of and α-Fe complex in Fe/Cu Granular Films Deposited by Cluster Beam Technique" J.Phys.Soc.Jpn.57. 599-603 (1998)

T.Hihara：“通过簇束技术沉积的 Fe/Cu 颗粒薄膜中 α-Fe 复合物的尺寸分布”J.Phys.Soc.Jpn.57 (1998)。

K.Sumiyama, T.Hihara, S.A.Makhlouf, K.Wakoh, M.Sakurai Y.Xu, T.J.Konno, S.Yamamuro and K.Suzuki: "Structural Difference between Fe/Cu and Fe/Ag Granular Films Produced by a Cluster Beam Method" Mat.Sci.Eng.A217/218. 340-343 (1996)

K.Sumiyama、T.Hihara、S.A.Makhlouf、K.Wakoh、M.Sakurai Y.Xu、T.J.Konno、S.Yamamuro 和 K.Suzuki：“簇生产的 Fe/Cu 和 Fe/Ag 颗粒薄膜之间的结构差异

T.Hihara, K.Sumiyama, H.Onodera, K.Wakoh and K.Suzuki: "Magnetism and Magnetoresistance in Fe/Cu Granular Films Prepared by Sputter Deposition and Subsequent Annealing" J.Phys.Soc.Jpn.66. 1785-1791 (1997)

T.Hihara、K.Sumiyama、H.Onodera、K.Wakoh 和 K.Suzuki：“溅射沉积和后续退火制备的 Fe/Cu 颗粒薄膜中的磁性和磁阻”J.Phys.Soc.Jpn.66。