Seagate Technology Incorporated

International Business Machines Corporation

Edward T Yen

Connie C Liu

Mason Lu

Kueir Weei Chour

Steve Hwang

Michael Zyee-Shan Wu

Lynn Li

Cheng Tzong Horng

Mariana Rodica Munteanu

Christopher H Bajorek

Michael C Wu

Weilu Hang Xu

Miaogen Lu

Shanghsien Alex Rou

Steve Kuo-Hsing Hwang

An embodiment of the invention relates to a perpendicular magnetic recording medium comprising (1) a substrate, (2) an interlayer comprising hexagonal columns and (3) a magnetic layer, wherein the magnetic layer is deposited applying a bias voltage to the substrate such that the magnetic layer comprises magnetic grains having substantially no sub-grains within the magnetic layer, and the magnetic layer has perpendicular magnetic anisotropy.

High density granular perpendicular recording media for mechanical reliability and corrosion resistance

A corrosion-resistant granular magnetic recording medium with improved recording performance comprises a non-magnetic substrate having a surface; and a layer stack on the substrate surface, including, in order from the surface: a granular magnetic recording layer; an intermediate magnetic de-coupling layer; and a corrosion preventing magnetic cap layer. The intermediate magnetic de-coupling layer has an optimal thickness and/or composition for: (1) promoting magnetic exchange de-coupling between the granular magnetic recording layer and the magnetic cap layer; and (2) reducing the dynamic closure field (H) for determining writeability and eraseability of the medium. Grain boundaries of the magnetic cap layer are substantially oxide-free, and have a greater density and lower average porosity and surface roughness than those of the granular magnetic recording layer.

Corrosion resistant granular magnetic stack

Corrosion-resistant granular magnetic media with improved recording performance and methods of manufacturing same

The method for making a shielded magnetoresistive (MR) sensor in which the first shield is made of sendust and the second shield is made of permalloy. The method comprises the stages of depositing a layer of sendust to form a first shield; heat treating the sendust layer at a temperature greater than 400.degree. C.; depositing a first electrically insulating layer; depositing, in the presence of a magnetic field, a MR layer; depositing a second layer of electrically insulating material; and, depositing a layer of permalloy to form the second shield.

Process for making a shielded magnetoresistive sensor

Method and apparatus for controlling the throat height of batch fabricated thin film magnetic transducers. During deposition of the transducer elements on a substrate, a resistive electrical lapping guide is deposited on at least one end of the array of transducer elements. The electrical lapping guide includes a plurality of switching junctions formed between a section of electrically resistive material and conductors. At least one switching junction is deposited on the substrate having a known switching plane position. During lapping of the transducer pole tip ends to a final height, the switching junction will change state to provide an accurate indication of the lapped throat height. The throat height, as determined from measured resistance of the lapping guide, is compared to the switching junction position at the time said switching junction changes state. Subsequent resistance measurements are calibrated in light of this comparison.

Electrical lapping guide for controlling the batch fabrication of thin

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San Jose, CA, United States of America

Edward T Yen