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Novel synthetic ferrimagnet pinned Layers for metallic CPP spin valves requiring high pinning-field and output

2005; IEEE Magnetics Society; Volume: 41; Issue: 10 Linguagem: Inglês

10.1109/tmag.2005.855312

1941-0069

Hirotaka Oshima, Kenshiro Nagasaka, A. Jogo, T. Ibusuki, Yutaka Shimizu, Atsushi Tanaka,

ZnO doping and properties

We have succeeded in enhancing the current-perpendicular-to-plane (CPP) magnetoresistance of the synthetic spin-valves by controlling the spin-dependent transport through the synthetic ferrimagnetic pinned layer using impurities. The new pinned layer overcomes the disadvantage of the synthetic pinned layer in CPP spin-valves for the magnetoresistance reduction. The experimental results are well described by our calculations based on the two-current theory. The proposed pinned layer, together with our newly developed magnetoresistive ferromagnetic materials, will be quite effective in producing CPP spin-valve sensors for ultrahigh-density data storage systems.