狭再生トラック幅CPP型スピンバルブGMRヘッド

概要

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Performance of dual spin-valve heads in current-perpendicular-to-plane (CPP) geometry was investigated by dynamic electrical tests (DET) and quasi-static tests (QST). Shielded CPP reader and stitched-pole writer composite heads were fabricated. We purposely produced various physical read track widths and areas of the dual spin-valve element, in the ranges of 41-175 nm and 0.0036-0.022μm^2, respectively. Materials used for the CPP dual spin-valve included Co_<90>Fe_<10>, Ni_<80>Fe_<20>, Cu, Ru, Ta, and Pt_<50>Mn_<50>, all of which are common in industrial current-in-plane (CIP) spin-valve heads. The shape and smoothness of the QST transfer curve and micro-track and full-track profiles of the narrow read track CPP heads are essentially the same as those of CIP spin-valve heads. A track-average-amplitude (TAA) of 0.6 mV was obtained in the CPP head with a physical read track width of 47 nm. Overall reader resistance of the CPP heads at the head gimbals assembly (HGA) level was in the range of l0-35 ohms, which proved to be appropriate.
2004-01-01