MR ratio enhancement by NOL current-confined-path structures in CPP spin valves
作者： H. Fukuzawa , H. Yuasa , S. Hashimoto , K. Koi , H. Iwasaki
关键词: Spin valve 、 Magnetoresistance 、 Spin-½ 、 Materials science 、 Nuclear magnetic resonance 、 Nanostructured materials 、 Giant magnetoresistance 、 Omega
摘要: We have compared the magnetoresistance (MR) performance of current-confined-path (CCP) current-perpendicular-to-plane giant (CPP-GMR) spin valve films with a nano-oxide-layer (NOL), made between natural oxidation (NO) and ion-assisted (IAO). For NO, an MR ratio was only 1.5% at RA 370 m/spl Omega//spl mu/m/sup 2/, whereas for IAO, greatly increased to 5.4% 500 2/. Fitted data by Valet-Fert model showing larger enhancement effect IAO is explained improvement metal-purity Cu inside CCP structure. By further Cu, large more than 30% can be expected small 300 The CCP-CPP film promising candidate realizing high-density recording heads 200 400-Gbpsi recording.
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