A Study on the Sensitivity of a Spin Valve with Conetic-Based Free Layers
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概要
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An exchange-biased spin valve with Conetic-based free layers of Co90Fe10, Co90Fe10/Conetic and Conetic was investigated. The spin valve with the Co90Fe10 free layer showed the highest giant magnetoresistance (GMR) ratio of 4% but showed the lowest normalized sensitivity of 0.02 Oe-1. The GMR ratio of 3% and the normalized sensitivity of 0.07 Oe-1 were obtained for the spin valve with the Co90Fe10/Conetic free layer after annealing. The spin valve having the Conetic free layer showed softer magnetic properties and well-defined smaller anisotropy than the other spin valves. Though the spin valve showed the lowest GMR of 0.4% after annealing, it showed the highest normalized sensitivity of 0.14 Oe-1. Our study shows that further improvement in MR response of spin valves with Conetic-based free layers can make a spin valve sensor promising for detecting extremely low fields.
- 2012-03-25
著者
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Hong Jongill
Materials Science And Engineering Yonsei University
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Son Jangyup
Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
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Kim Sanghoon
Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
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Hong Jongill
Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
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Lim Jongkoo
Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
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Ko Jungho
Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
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Lee Soogil
Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
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