Investigation of Surface and Interfacial Roughness in multilayrs by Neutron Reflectivity Measurements

通过中子反射率测量研究多层表面和界面粗糙度

• 批准号: 06640463
• 负责人: TAKEDA Masayasu
• 金额: $ 1.09万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06640463/
• 关键词: neutrons; reflectivity; off specular reflection; surface; interface; roughness; neutron; reflectivity; off specular; surface; interface; roughness

Reflectivity measurements of Fe/Cr and Co/Cu multilayrs with different interfacial roughness have been done both on the TOP spectormter installed at KENS (Pulsed Neutron Source in National Laboratory for High Energy Physics) and on the TOPAN spectrometer at JRR-3M in Tokai Establishment of JAERI in order to know how the surface and interfacial roughness appear in the reflectivity curves. These multilayrs are well known to be show the ginat magnetoresistance effect which is belived to have a close relation with the interfacial roughness between the magnetic and non magnetic layrs. The claer difference of magnetic field dependence of resistivity was observed in the samples. The difference also appears in the reflectivity curves and it has been revealed that the reflectivity curve of neutrons is very sensitive to the interfacial roughness.Simulation program which takes into accunt interfacial roughness was coded in order to get the quantitative information on the interfcaial roughness.The Program can well reproduce the experimental results of reflectivity curves in the case of small interfacal roughness, however, fail to explain the case of large interfacial roughness. Improvement of the program is now in progress.

为了了解不同界面粗糙度的Fe/Cr和Co/Cu多层膜在反射率曲线上的表现形式，在日本高能物理国立实验室脉冲中子源TOP谱仪和日本原子力研究所东海研究所JRR-3 M型TOPAN谱仪上，对具有不同界面粗糙度的Fe/Cr和Co/Cu多层膜进行了反射率测量。这种多层膜表现出的磁电阻效应与磁性层和非磁性层之间的界面粗糙度有密切关系。在样品中观察到电阻率随磁场变化的明显差异。在界面粗糙度的影响下，中子反射率曲线也出现了明显的差异，表明中子反射率曲线对界面粗糙度非常敏感，为了得到界面粗糙度的定量信息，编制了考虑界面粗糙度的模拟程序，该程序在界面粗糙度较小的情况下能很好地再现反射率曲线的实验结果，但在界面粗糙度较小的情况下，模拟结果与实验结果相差不大。不能解释大的界面粗糙度的情况。目前正在对该方案进行改进。

项目成果

武田全康: "Polarizing Neutron Guicle of a V-Shape-mirror with Pulsed Cold Noutrons" JPSJ. (発表予定).

Zenyasu Takeda：“脉冲冷中子 V 形镜的偏振中子指南”JPSJ（待出版）。

M.Takeda, Y.Endoh, A.Kamijo and J.Mizuki: "Reflectivity Measurements on Fe/Cr Multilayrs with Different Interfacial Roughness" KENS REPORT. X. 180-181 (1995)

M.Takeda、Y.Endoh、A.Kamijo 和 J.Mizuki：“具有不同界面粗糙度的 Fe/Cr 多层的反射率测量”KENS 报告。

S.Itoh and M.Takeda: "Polarizing Beam Splitter Device at a Pulsed Neutron Source" J.Phys.Soc.Jpn.65(印刷中). (1996)

S.Itoh 和 M.Takeda：“脉冲中子源的偏振分束器装置”J.Phys.Soc.Jpn.65（出版中）。

M.Takeda, Y.Endoh, A.Kamijo and J.Mizuki: "Interfacial Roughness and the Giant Magnetoresistance Effect of Fe/Cr Multilayrs" Physica. B213 & 214. 248-250 (1995)

M.Takeda、Y.Endoh、A.Kamijo 和 J.Mizuki：“界面粗糙度和 Fe/Cr 多层的巨磁阻效应”物理学。

M.Takeda 他: "Interfacial Roughness and the giant magnetoresistance effect" Physica B. 213&214. 248-250 (1995)

M.Takeda 等人：“界面粗糙度和巨磁阻效应”Physica B. 213&214 (1995)。