Quantum Peripherals Colorado, Inc.

Storage Technology Corporation

Guy F Ruse

J Lamar Nix

Daniel J O'Connor

Paul D Reinholz

James L Nix

Anthony C Helms

Richard H Dee

Darwin D King

Laurence L Rea

An improved magnetoresistive device and method for fabricating the same which results in improved Barkhausen noise suppression. A generally coplanar device is described having an MR structure conductive region longitudinally biased by opposing permanent magnet layers separated therefrom by a non-magnetic metal or dielectric separation layer. Significant reduction of the demagnetization energy near the MR-to-permanent magnet junction is achieved, particularly in the use of an elliptically shaped conductive region and the resultant generally coplanar device is readily fabricated and reproducible using a self-aligning process. The longitudinal bias technique described can be used in conjunction with all known transverse bias techniques.

Method of making a magnetoresistive device having improved Barkhausen

A soft adjacent layer biased magnetoresistive ('MR') device, and a method for producing the same, which incorporates a natural flux closure design utilizing coplanar thin film permanent magnets to stabilize the device while obviating induced domain walls in the magnetoresistive and soft adjacent layers ('SAL'). The device structure includes an SAL film and overlying magnetic spacer layer ('MSL') in conjunction with an MR film to produce an SAL biased magnetoresistive structure ('MRS') with the MR layer patterned to a shortened length with respect to the SAL and MSL layers. A non-magnetic metal or dielectric separation layer of on the order of 20-300 angstroms ('.ANG.') is then deposited over the MSL layer and the sides of the MR layer followed by the deposition of permanent magnet layer portions substantially coplanar with the MR layer to produce a low energy equilibria device with high sensitivity and superior signal output.

Process for forming a magnetoresistive device

Soft adjacent layer biased magnetoresistive device incorporating a

An improved magnetoresistive device and method for fabricating the same which results in improved Barkhausen noise suppression. A generally coplanar device is described having an MR structure conductive region longitudinally biased by opposing permanent magnet layers separated therefrom by a non-magnetic metal or dielectric separation layer. significant reduction of the demagnetization energy near the MR-to-permanent magnet junction is achieved, particularly in the use of an elliptically shaped conductive region and the resultant generally coplanar device is readily fabricated and reproducible using a self-aligning process. The longitudinal bias technique described can be used in conjunction with all known transverse bias techniques.

Magnetoresistive device and method having improved Barkhausen noise

A method and apparatus is disclosed for permitting a plurality of substrates to be positioned within a magnetic field unique to each substrate so that the plurality of substrates may be placed in a vacuum chamber and concurrently coated with a thin film. A magnetic field unique to and associated with each substrate may be oriented so that all substrates have a uniform magnetic field and magnetic orientation. Alternatively, the magnetic field and orientation of each substrate may be individually tailored to produce a different magnetic characteristic for each substrates.

Method and apparatus for producing magnetically oriented films on

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Boulder, CO, United States of America

Guy F Ruse