Effects of an underlayer on the sensitivity of top spin valves

Xiao-Li Tang; Huai-Wu Zhang; Hua SuZhi-Yong ZhongYu-Lan Jing

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Effects of an underlayer on the sensitivity of top spin valves

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Top spin valves of NiFe/Cu/NiFe/FeMn/Ta with a Ta or Cu underlayer were investigated. Measurements showed a substantial magnetoresistance ratio for samples with either type of underlayer. The sensitivity of spin valves, defined as the slope of the magnetoresistance curve between 10 and 90 of the giant magnetoresistance ratio, was much greater for the Ta than for the Cu underlayer. This difference in sensitivity is attributed to magnetization reversal of the free layer (NiFe) directly deposited on the underlayer. Investigation of the surface microstructure and composition of Ta and Cu/NiFe bilayers indicated that Cu atoms, which possess lower surface free energy than the other elements in the bilayers, float out to the surface of NiFe free layer and are responsible for the lower sensitivity of the spin valve. Therefore, by choosing underlayer material with suitable surface free energy, top spin valves with high sensitivity can be realized.

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来源
《Journal of Applied Physics》 |2007年第4期|043915.1-043915.4|共9页
作者
Xiao-Li Tang; Huai-Wu Zhang; Hua SuZhi-Yong ZhongYu-Lan Jing;
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作者单位

State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610054, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类应用物理学;计量学;
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Effects of an underlayer on the sensitivity of top spin valves

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