Seagate Technology Incorporated

James Kent Howard

Sakhrat Khizroev

Kurt W Wierman

Dmitri Litvinov

Eric Walter Singleton

Dieter Klaus Weller

Ganping Ju

Timothy John Klemmer

Sharat Batra

Yukiko A Kubota

Rene Johannes Marinus Van De Veerdonk

Thomas Francis Ambrose

Gregory John Parker

Christopher Loren Platt

David James Larson

Isabel Goncalves Trindade

Roy Wallace Gustafson

A transducing head includes a first bias element, a second bias element, and a magnetoresistive sensor positioned between the first bias element and the second bias element. The first bias element and the second bias element are each formed of a permanent magnet material having a remanent magnetic moment in a range of about 200 to about 800 emu/cm. In a preferred embodiment, the permanent magnet material is an alloy comprising iron, platinum, and at least one material selected from copper, silver, magnesium, lead, zinc, bismuth, and antimony.

Magnetoresistive transducer with low magnetic moment, high coercivity stabilizing magnets

A perpendicular exchange biased device comprises a layer of buffer material on a surface of a substrate, a layer of ferromagnetic material on a surface of the buffer layer, wherein the magnetization of the ferromagnetic layer lies in a direction perpendicular to the plane of the layer of ferromagnetic material, and a layer of antiferromagnetic material on a surface of the layer of ferromagnetic material. A method of making a perpendicular exchange biased device comprising positioning a layer of buffer material on a surface of a substrate, positioning a layer of ferromagnetic material on a surface of the layer of buffer material, wherein the magnetization of the ferromagnetic layer lies in a direction perpendicular to the plane of the layer of ferromagnetic material, and positioning a layer of antiferromagnetic material on a surface of the layer of ferromagnetic material is also included.

Thin film device with perpendicular exchange bias

A perpendicular magnetic recording medium includes a hard magnetic recording layer and a soft magnetic underlayer adjacent the hard magnetic recording layer. The soft magnetic underlayer includes first and second ferromagnetically coupled multilayer structures and a coupling layer positioned between the first and second multilayer structures for antiferromagnetically coupling the first and second multilayer structures. A magnetic disc drive storage system incorporating such a perpendicular magnetic recording medium and a method of making such a perpendicular magnetic recording medium are also included.

Multilayer films for optimized soft underlayer magnetic properties of dual layer perpendicular recording media

Magnetic recording media having a biased soft magnetic underlayer are disclosed. The soft magnetic underlayer includes at least two soft magnetic layers separated by a thin non-magnetic layer. Magnetostatic coupling between the soft magnetic layers causes the magnetizations in the layer to be anti-parallel. The biased soft magnetic underlayer is brought into a substantially single-domain state, thereby reducing or eliminating unwanted noise in the soft underlayer. In a preferred embodiment, the recording media includes a perpendicular magnetic recording disk.

Perpendicular magnetic recording media with laminated soft magnetic underlayer

Materials including alternating magnetic layers and spacer layers for use as hard magnetic recording layers of magnetic recording media are disclosed. The spacer layers and the magnetic layers are treated in an oxygen-containing atmosphere in order to form oxidized boundary layers between adjacent granular columns extending through the layers. The columnar microstructure extends through the entire thickness of the multilayer structure to thereby exchange decouple the magnetic layers as well as the spacer layers. The spacer and magnetic layers may include additives which are present in grain boundary regions throughout the layers. The presence of the additives in the grain boundary regions may facilitate diffusion and oxidization between the adjacent granular columns. In a particular embodiment, the magnetic layers comprise Co, the spacer layers comprise Pd, and the additives comprise Cr, Pt, B, Ta, Nb or combinations thereof.

Multilayer magnetic recording media with columnar microstructure for improved exchange decoupling

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Pittsburgh, PA, United States of America

James Kent Howard