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US 8,786,987 B2Granted
Biased two dimensional magnetic sensor
AssigneeSeagate Technology LLC
InventorsHarry Sam Edelman, Thomas Roy Boonstra
Life of this patent
Estimating the term…
Abstract
Apparatus for two dimensional reading. In accordance with some embodiments, a magnetic read element has a bias magnet disposed between a plurality of read sensors. The bias magnet may be configured to concurrently bias each read sensor to a predetermined magnetization.
Claims20
An apparatus comprising:
- a bias magnet disposed between a plurality of read sensors, the bias magnet configured to concurrently bias each read sensor to a predetermined magnetization, wherein each read sensor comprises a trilayer stack characterized as comprising first and second magnetically free layers separated by a non-magnetic spacer and biased to the predetermined magnetization only by the bias magnet.
A magnetic read element comprising:
- a plurality of read sensors formed on an air bearing surface (ABS) by an isolation trench dissecting a plurality of layers;
- and
- a bias magnet disposed between the plurality of read sensors, distal the ABS, the bias magnet configured to concurrently bias each read sensor to a predetermined magnetization, wherein the isolation trench dissects a top magnetic shield that extends adjacent each of the plurality of read sensors.
A transducing head comprising:
- first and second read sensors;
- a bias magnet positioned on an air bearing surface (ABS) and configured to concurrently bias the first and second read sensors to a predetermined magnetization;
- and
- a permanent magnet positioned distal the ABS and between the first and second read sensors.
1 more element
An apparatus comprising:
- first and second read sensors;
- a bias magnet configured to concurrently bias each of the first and second read sensors to a predetermined magnetization;
- and
- top and bottom magnetic shields respectively adjacent the first and second read sensors and the bias magnet, wherein the top and bottom magnetic shields each continuously extend from the first read sensor to the second read sensor, and wherein the top shield is split into sub-shields by an isolation trench proximal the bias magnet.
1 more element
Dependencies are inferred from the claim text.