Patent ID: 6028730
Filing Date: 2000-02-22
Classification: B82Y,G11B,H01F

Abstract:
A device for supplying an initialization pulse current to at least laminations of a pinned ferromagnetic layer, a non-magnetic metal layer and a free ferromagnetic layer in a magnetoresistive transducer in an initialization pulse current direction which is perpendicular to a predetermined magnetization direction of said pinned ferromagnetic layer and also parallel to an interface between the pinned ferromagnetic layer and the non-magnetic metal layer,wherein said device comprises an initialization pulse current generator electrically connected via a first ON/OFF switch to a pair of terminals electrically connected to opposite ends of said laminations for applying a pulse voltage between said opposite ends of said laminations to flow the initialization pulse current in said initialization pulse current direction through said laminations; anda detection current generator electrically connected via a second ON/OFF switch to said paired terminals for applying a voltage between said opposite ends of said laminations to flow a detection current in an anti-parallel direction to said initialization pulse current direction, wherein said first and second ON/OFF switches are operated not to take the ON state concurrently.