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，我们主要使用面向目标型溅射生成高度随机的系统。我们研究了这些系统中的化学，结构和形态波动，并研究了这些系统中的纳米粒状颗粒形成，作为沉积条件和随后退火的功能，以及它们与磁性和电气性能的关联。以下是大纲。1）对于具有良好垂直各向异性的Fe-Cr-N合金膜，观察到磁性扭矩，铁磁共振和Mossbauer效应可以理解磁性和结构中的显微镜波动。通过X射线光发射光谱分析化学键合态。将这些结果与X射线衍射和透射电子显微镜（TEM）观测结合在一起，我们可以将垂直的磁各向异性分配给这些膜的复杂结构：垂直于膜平面的认证α-FE结晶岩垂直于膜平面，沿着圆形胶质的晶体边界散发出了很大的分散。垂直于膜平面。2）对于Co-C膜，观察到TEM显微照片，磁化强度和电阻。当底物温度低于300℃时，获得了异形的CO-C相，而直径约20nm的CO颗粒则形成约20nm的CO颗粒，并被C（Graplicte）边界包围，T_S-350 c（墨西哥）边界包围，则在T_S-350 c（Grand）边界上揭示了一个粒状结构，并且相位分离较大，在T_S> 400 of coert of t_s> 400 oer的范围内，相当大的oert of coert of a> 400 oeer of 400。对于CO_ <50> C_ <50>在T_S-350 ﾟ c.3上制作的膜，用于通过热蒸发产生的EU-FE随机合金在低温下检测到磁磁性的符号变化发生的元磁性转变。在由电离簇束法产生的Fe-Cu颗粒膜中，此外，Cu基质中的Fe簇的结构从FCC到BCC不等，而Fe含量增加，并且FE簇的磁性状态存在层次结构。较少的

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)。

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。

J.Sakurai, D.Huo, T.Kuwai, K.Mori, T.Hihara, K.Sumiyama and K.Suzuki: "The Sign of Magneto-Thermoelectric Power of Magnetic Granular Alloys" J.Phys.Soc.Jpn.66. 2240-2243 (1997)

J.Sakurai、D.Huo、T.Kuwai、K.Mori、T.Hihara、K.Sumiyama 和 K.Suzuki：“磁性粒状合金的磁热电动势的标志”J.Phys.Soc.Jpn.66