Effect of superconductivity on magnetoresistance in ferromagnetic tunnel junctions

被引：1
作者：
Shimazu, Y [1 ]
Ishikawa, F [1 ]
Yamamoto, I [1 ]
Yamaguchi, M [1 ]
机构：
[1] Yokohama Natl Univ, Dept Phys, Fac Engn, Hodogaya Ku, Yokohama, Kanagawa 2408501, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1998年 / 37卷 / 6A期
关键词：
magnetoresistance; superconductivity; ferromagnetic tunnel junction; magnetic thin film;
D O I：
10.1143/JJAP.37.3299
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We studied the magnetoresistance of Ni/Al-Al2O3/Co tunnel junctions at T > 1.4 K. Below the superconducting transition temperature of deposited Al films, a nonmonotonic magnetoresistance was observed. The fractional change in junction resistance was 14% at 1.4 K. The nonmonotonic behavior of the magnetoresistance can be explained in terms of the dependences of the superconducting energy gap and the sheet conductivity of the Al layer on the magnetic field. This explanation was supported by the results of an experiment on an Al-Al2O3/Ni tunnel junction which also showed a large magnetoresistance below T-c due to the superconductivity effect.
引用
收藏
页码：3299 / 3303
页数：5
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