積層フェリ型フリー層とピン層を用いたスピンバルブGMRヘッド

概要

論文の詳細を見る
To improve GMR head performance for future higherdensity recording, it is important not only to enhance the MR ratio of GMR film, but also to reduce the effective free-layer moment in order to make the freelayer more sensitive to the external field. A spin-filtertype spin valve is suitable for this purpose. However, even with a spin-filter, it will be difficult to reduce the effective free-layer thickness to less than 15A without sacrificing its soft magnetic properties and large MR ratio. A synthetic ferrimagnet free layer consisting of two ferromagnetic layers anti-parallel coupled through a nonmagnetic interlayer can reduce its effective thickness without reducing its physical thickness, and is a candidate to succeed the spin-filter. This paper reports the basic characteristics of the synthetic free layer and shows that the synthetic free layer combined with the synthetic pinned layer is thermally stable enough and suitable for combination with PtMn, which requires annealing for its lattice ordering.
2000-09-01