Seagate Technology Incorporated

Control Data Corporation

Magnetic Peripherals Inc.

Philips Electronics North America Corporation

Arthur Calderon

Leroy L Longworth

Beat G Keel

Douglas J Hennenfent

Allan E Schultz

Allan L Holmstrand

Peter K George

William P Wood

Peter I Bonyhard

Jumna P Ramdular

Simon H Liao

Craig M Perlov

Larry D Zimmerman

Terry Mitchell

Paul S Blaske

Todd Backer

Wei Cheng Hsie

Juan J Fernandez-De Castro

MR sensor having thick active region between two thinner inactive MR

In a thin film magnetic head comprising a magnetoresistive sensing element (MRE) located inwardly from the head face, a first section of a broken flux guide extending inwardly from the head face to overlie one peripheral edge portion of the MRE, and a second section overlying an opposite peripheral edge portion of the MRE, the space overlying the MRE between the flux guide sections is filled with a poller such as a photoresist, providing a smooth surface for a test/bias conductor, reducing shorts due to inadequate step coverage, and providing mechanical stress relief, leading to improved stability of the MRE.

Thin film magnetic head having polymer on broken flux guide sections,

In a method of manufacturing a thin film magnetic head having aligned top and bottom pole tip pieces, a sacrificial mask protects the upper pole tip while the exposed non-aligned portions of the gap material and lower pole tip are removed. The sacrificial mask is deposited using a self alignment technique.

Self aligned magnetic poles using sacrificial mask

A vertical recording head includes a W-shaped core, a substrate carrying a thin film probe supported in one slot of the core, and a shield coil wound in the slots to hold the substrate and assemblage together. A non-magnetic cap forms the surface of the head over the cap, with the arrangement being such that the probe extends through the cap so the magnetic gap is as small as possible.

Thin film vertical recording head

A process for fabricating a negative pressure slider is disclosed which briefly comprises the steps of: (a) applying a dry negative photoresist layer to the surface of the slider; (b) positioning a mask having alignment marks which are too narrow to be resolved during exposure and development to pattern the photoresist layer to expose the portions of the flying surface of the slider to be milled by an ion milling process; (c) ion milling the slider wherein the patterned photoresist layer protects the flying surface of the slider while the negative pressure cavities of the slider are being milled; and (d) removing the remaining portions of the photoresist layer once the negative pressure cavities have been milled.

Process for fabricating negative pressure sliders

A magnetic head is manufactured by depositing a layer of spacer material onto the facing surfaces of the magnetic cores; the thickness of each layer being approximately one-half the length of the intended gap and the thicknesses of both layers together being approximately equal to the thickness (length) of the gap. A layer of bonding glass is deposited onto the surfaces of the spacer layers and the cores are pressed together at an elevated temperature to fuse the glass layers and extrude most of the glass.

Method of forming gaps in magnetic heads

A grid system for an ion beam generator is provided having a frustoconical shape so that the collimated ion beam converges at a predetermined angle toward the target to provide selective beveled etching.

Ion beam generator having concentrically arranged frustoconical

Growing community of inventors

Minnetonka, MN, United States of America

Arthur Calderon