Method and apparatus for enhanced dual spin valve giant magnetoresistance effects having second spin valve self-pinned composite layer

摘要

A dual spin valve giant magnetoresistance (GMR) sensor having two spin valves with the second spin valve being self-biased is disclosed herein. According to the present invention a dual spin valve system is disclosed wherein the first of the two spin valves in the dual spin valve element is pinned through exchange coupling, i.e., a first anti-ferromagnetic pinning layer and a first ferromagnetic pinned layer structure are exchange coupled for pinning the first magnetic moment of the first ferromagnetic pinned layer structure in a first direction. The second of the two spin valves in the dual spin valve system is self-pinned. The self-pinned spin valve does not use any anti-ferromagnetic layers to pin the magnetization of the pinned layers.