Determining thickness of thin metal films with spectroscopic ellipsometry for applications in magnetic random-access memory

被引:27
作者
Tompkins, HG [1 ]
Zhu, T [1 ]
Chen, E [1 ]
机构
[1] Motorola Inc, Phoenix Corp Res Labs, Tempe, AZ 85284 USA
来源
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS | 1998年 / 16卷 / 03期
关键词
D O I
10.1116/1.581277
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Metal thicknesses can be determined using optical methods such as spectroscopic ellipsometry when the thickness of the film is small enough that the light penetrates to the bottom of the film. In order to use ellipsometry, it is necessary to determine the optical constants of the film material accurately. In this work, we describe the determination of the optical constants and thicknesses of single metal layers of NiFe, Cu, Co, Ta, FeMn deposited with two different deposition methods. The thicknesses range from about 6 to about 20 nm thick. We have also investigated the ex situ measurement of multiple metal layers, and discuss the conditions where the thicknesses of the individual layers can be determined and the conditions where they cannot be distinguished from each other. (C) 1998 American Vacuum Society.
引用
收藏
页码:1297 / 1302
页数:6
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