Dual spin valves with nano-oxide layers |
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| Institution: | 1. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China;2. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;1. Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;3. Jiaozhou Bay Marine Ecosystem Research Station, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;1. Korea Institute of Ceramic Engineering & Technology, 15-5, Chungmugong-dong, Jinju-si, Gyeongsangnam-do 52851, Republic of Korea;2. Metamaterial Electronic Device Research Center, Hongik University, Seoul 121-791, Republic of Korea |
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| Abstract: | A novel method is proposed for increasing the giant magnetoresistance (GMR) of dual spin valves of the CoFe/Cu/CoFe/Cu/CoFe type by inserting nano-oxide layers (NOLs) into the pinned layers. Using this method, MR ratio of 23.5% was obtained, a value equal to those of specular spin valves with antiferromagnetic oxide, e.g., NiO. This method allows the selection of metallic materials for the antiferromagnetic layer. In addition, we obtained the specularity factor of upper NOLs, 0.8, and that of lower NOLs, 0.7, by calculating Boltzmann equations taking into account the roughness of each interlayer. This model shows that the MR ratio would be 27.5% for dual spin valves with ideal NOLs. |
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