skip to main content

Title: Read/write head having a GMR sensor biased by permanent magnets located between the GMR and the pole shields

A compact read/write head having a biased giant magnetoresistive sensor. Permanent magnet films are placed adjacent to the giant magnetoresistive sensor operating in the current-perpendicular-to the-plane (Cpp) mode and spaced with respect to the sensor by conducting films. These permanent magnet films provide a magnetic bias. The bias field is substantial and fairly uniform across sensor height. Biasing of the giant magnetoresistive sensor provides distinguishable response to the rising and falling edges of a recorded pulse on an adjacent recording medium, improves the linearity of the response, and helps to reduce noise. This read/write head is much simpler to fabricate and pattern and provides an enhanced uniformity of the bias field throughout the sensor.
Authors:
 [1] ;  [2] ;  [3]
  1. (San Carlos, CA)
  2. (Fremont, CA)
  3. (San Jose, CA)
Publication Date:
OSTI Identifier:
872201
Report Number(s):
US 5883763
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Country of Publication:
United States
Language:
English
Subject:
write; head; gmr; sensor; biased; permanent; magnets; located; gmr; pole; shields; compact; write; head; biased; giant; magnetoresistive; sensor; permanent; magnet; films; placed; adjacent; giant; magnetoresistive; sensor; operating; current-perpendicular-to; the-plane; cpp; mode; spaced; respect; sensor; conducting; films; permanent; magnet; films; provide; magnetic; bias; bias; field; substantial; fairly; uniform; sensor; height; biasing; giant; magnetoresistive; sensor; provides; distinguishable; response; rising; falling; edges; recorded; pulse; adjacent; recording; medium; improves; linearity; response; helps; reduce; noise; write; head; simpler; fabricate; pattern; provides; enhanced; uniformity; bias; field; throughout; sensor; magnetoresistive sensor; magnetoresistive sensor; magnetoresistive sensor; placed adjacent; permanent magnet; permanent magnet; permanent magnet; permanent magnets; giant magnetoresistive; giant magnetoresistive; giant magnetoresistive; write head; write head; write head; recording medium; conducting films; bias field; bias field; field throughout; conducting film /360/