Seagate Technology Incorporated

Read Rite Corporation

Peter I Bonyhard

Charles H Tolman

William P Wood

James F Dolejsi

Allan E Schultz

Peter K George

Jumna P Ramdular

Arthur Calderon

Ningjia Zhu

Leroy L Longworth

Ernest Anthony Louis

Juan J Fernandez-De Castro

A method and system for providing a magnetoresistive head that reads data from a recording media is disclosed. The method and system include providing a first shield, a second shield, a magnetoresistive sensor, and a lead. The first shield has a first end, a central portion and a second end. The first end is closer to the recording media during use than the second end. The second shield has a first end, a central portion, and a second end. The first end of the second shield is separated from the first end of the first shield by a read gap. The central portion of the second shield is separated from the central portion of the first shield by a distance that is greater than the read gap. The magnetoresistive sensor is disposed between the first shield and the second shield and has a front end and a back end. The front end of the magnetoresistive sensor is electrically coupled with the first end of the first shield or the first end of the second shield. The lead is electrically coupled with the back end of the magnetoresistive sensor. Thus, current is driven through the magnetoresistive sensor in a direction substantially perpendicular to the recording media during use.

Vertical giant magnetoresistance sensor using a recessed shield

Servo-pattern information is magnetically recorded on a product disc by magnetic print-through from a master medium. The master servo-writing medium is brought into close proximity with the product &ldquo;slave&rdquo; disc, and the two are subjected to an external magnetic field which assists in transferring magnetic servo-patterns to the slave disc in a print-through process. The preferred external magnetic field alternates and rotates with respect to the master/slave combination. In an alternative product disc structure, the magnetic layer is magnetically altered in a servo-pattern configuration. Non-magnetic portions of the servo pattern are created which define both gray code and servo burst information for the product disc.

Quickly written servo-patterns for magnetic media including depositing after writing

Quickly written servo-patterns for magnetic media including writing a servo-master pattern

Servo-pattern information is magnetically recorded on a product disc by magnetic print-through from a master medium. The master servo-writing medium is brought into close proximity with the product 'slave' disc, and the two are subjected to an external magnetic field which assists in transferring magnetic servo-patterns to the slave disc in a print-through process. The preferred external magnetic field alternates and rotates with respect to the master/slave combination. In an alternative product disc structure, the magnetic layer is magnetically altered in a servo-pattern configuration. Non-magnetic portions of the servo pattern are created which define both gray code and servo burst information for the product disc.

Quickly written servo-patterns for magnetic media including removing

Using servowriter medium for quickly written servo-patterns on magnetic

A barberpole magnetoresistive (MR) sensor has a series of permanent magnet strips interleaved with a series of magnetoresistive strips. Conductive barberpole strips are canted across the sensor and connect one magnetoresistive strip, over a permanent magnet strip, to another magnetoresistive strip. The permanent magnet strips help to provide a uniform magnetic field throughout the sensor, thereby making the sensor more immune to harm from an external magnetic field and more likely to reset into a single magnetic domain oriented as desired if an external magnetic field should cause the sensor to fracture into multiple magnetic domains.

Barberpole MR sensor having interleaved permanent magnet and

MR sensor having thick active region between two thinner inactive MR

An MR sensor having improved current density distribution, reduced overall resistance and a substantially planar surface is disclosed. The MR sensor includes an MR layer having first and second outer regions and an active region located between the first and second outer regions. A first permanent magnet region is formed upon the first MR layer outer region and defines a first boundary of the MR layer active region. A second permanent magnet region is formed upon the second MR layer outer region and defines a second boundary of the MR layer active region so that a gap region is positioned at least partially between the first and second permanent magnet regions. A spacer layer is formed on the MR layer active region between the first and second permanent magnet regions. A soft adjacent layer is formed in the active region and upon the spacer layer, and, in some preferred embodiments, also at least partially upon the permanent magnet region.

Method of making a magnetoresistive sensor

Magnetoresistive sensor with improved performance and processability

Growing community of inventors

Milpitas, CA, United States of America

Peter I Bonyhard