Abstract
A current-perpendicular-to-the-plane (CPP)-spin-valve sensor with iron-added magnetite layers (IMLs) was investigated. We prepared bottom synthetic-pin spin-valve films with CoFe∕IML∕CoFe sandwiched layers as both free layers and pinned layers. The slope of resistance-change-area product (ΔRA) versus IML thickness is around 0.5–0.6Ωμm2∕nm, and this indicates that using IMLs results in large bulk scattering. Magnetite and iron grains were observed in transmission electron microscopy images even in a 2-nm-thick IML in a CPP giant magnetoresistance structure. As a result, ΔRA up to 2–2.5mΩμm2 and MR ratio of 2.0%–2.6% at RA of 0.08–0.1Ωμm2 were obtained by using IML in CPP-spin-valve films.
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