Patent Number: 6,169,647

Title: Giant magnetoresistive sensor having weakly pinned ferromagnetic layer

Abstract: The data storage system includes a storage medium having a data surface with data stored thereon, the stored data comprises variations in magnetic fields across the data surface. A slider is adapted to move across the data surface, the slider includes an air bearing surface (ABS) which is substantially parallel to the data surface. A current source provides a sense current (I) and readback circuitry is adapted to receive a readback signal and responsively provide a data output. A magnetoresistive sensor carried on the slider is adapted to receive the sense current (I), readback data from the data surface in response to variations in the magnetic field across the disc surface, and responsively provide the readback signal to the readback circuitry. The sensor is adapted to exhibit a GMR effect in response to a magnetic field. The sensor includes a free layer and a pinned layer each having respective quiescent magnetic field vectors. The magnetic field vectors of the free layer and the pinned layer both rotate in response to an applied magnetic field.

Inventors: Mao; Sining (Savage, MN), Hu; Shouxiang (Edina, MN)

Assignee: Seagate Technology LLC

International Classification: G01R 33/09 (20060101); G01R 33/06 (20060101); G11B 5/00 (20060101); G11B 5/39 (20060101); G11B 5/012 (20060101); G11B 005/39 ()

Expiration Date: 01/02/2018