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A Co-SiO _2 Granular Material as a New Current-Confining Layer for Current Perpendicular-to-Plane Spin Valves

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7 Author(s)
Jogo, A. ; Adv. Magnetic Recording Lab., Fujitsu Labs. Ltd., Atsugi ; Seyama, Yoshihiko ; Ibusuki, T. ; Nagasaka, Keiichi
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We have investigated a possibility of Co-SiO2 granular material as a current-confining layer of confined current path (CCP) type-current perpendicular-to-plane (CPP) spin valves (SVs). A resistance-area (RA) product can be controlled by a composition and a thickness of the Co-SiO2 granular layer, and it showed a higher controllability compared to a conventional oxidized metal current-confining layer. The CPP-SV with Co-SiO2 granular layer performed at a relatively large MR ratio of 5.7% with a RA of 1 Omegamum2 and showed a potential of 5% with 500 mOmegamum2. This indicates a role of the Co-SiO2 granular layer as a current-confining structure. Although a tolerance to an applied voltage is insufficient at this stage, a granular material as a current-confining layer, such as Co-SiO2 , will open a door to a realization of CPP-SV magnetic recording heads for an ultrahigh-density recording system

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Magnetics, IEEE Transactions on  (Volume:42 ,  Issue: 10 )