Back to results
US 2002/0158629 A1Published application
Novel method to detect junction induced signal instability from gmr/mr heads
AssigneeSamsung Electronics Co., Ltd.
InventorsGeng Wang, Zhaohui Li, Hyung Jai Lee
Life of this patent
Estimating the term…
Abstract
A method to test an instability of a magneto-resistive (MR) head. The instability is tested by first writing a signal onto a track. The junctions of the MR head are aligned with various track edges and the head characteristics are then measured. The characteristics may include determining a maximum amplitude covarian and a maximum base line popping noise.
Claims9
A method for testing a magnetic recording head of a hard disk drive, comprising:
- writing a track onto a disk, the track having a left track edge and right track edge;
- measuring a profile of the track;
- moving a magnetic head so that a right junction area of the magnetic head is aligned with the left track edge;
- measuring a first amplitude covarian of a signal provided by the magnetic head;
- moving the magnetic head so that a left junction area of the magnetic head is aligned with the right track edge;
- and,
- measuring a second amplitude covarian of the signal provided by the magnetic head.
4 more elements
A method for testing a magnetic head of a hard disk drive, comprising:
- writing a track on a disk, the track having a left track edge and a right track edge;
- measuring a track profile;
- moving a magnetic head so that a right junction area of the magnetic head is adjacent to the left track edge;
- measuring a first noise in a signal provided by the magnetic head;
- moving the magnetic head so that a left junction area of the magnetic head is adjacent to the left track edge;
- measuring a second noise in the signal provided by the magnetic head;
- moving the magnetic head so that the right junction area is aligned with the right track edge;
- measuring a third noise in the signal provided by the magnetic head;
- moving the magnetic head so that the left junction area is aligned with the right track edge;
- and,
- measuring a fourth noise in the signal provided by the magnetic head.
8 more elements
Dependencies are inferred from the claim text.