Seagate Technology Incorporated

Carnegie Mellon University

Li-Lien Lee

Samuel Dacke Harkness, Iv

David N Lambeth

David Eugene Laughlin

Rajiv Yadav Ranjan

Qixu David Chen

Erol Girt

Thomas P Nolan

Michael C Wu

Byung-ki Cheong

Shanghsien Alex Rou

Shanghsien S Rou

Jianhua Xue

Bin Lu

Mariana Rodica Munteanu

Youfeng Zheng

Connie C Liu

Weilu Hang Xu

Chung-hee Chang

Zhong (Stella) Wu

Samuel Dacke Harkness

Li Tang

Jai-Young Kim

Eric Steck Freeman

Roger Ristau

Romulo Ata

Chunghee Chang

Pengcheng Li

Kien Vinh Hua

Apparatus for recording data and method for making the same. In accordance with some embodiments, a recording layer is supported by a substrate. The recording layer has a granular magnetic recording layer with a first oxide content, a continuous magnetic recording layer with nominally no oxide content, and an oxide gradient layer disposed between the respective granular magnetic recording layer and the continuous magnetic recording layer. The oxide gradient layer has a second oxide content less than the first oxide content of the granular layer.

Perpendicular recording medium with oxide gradient layer

A perpendicular magnetic recording medium comprises a non-magnetic substrate having a surface; and a plurality of overlying thin film layers forming a layer stack on the substrate surface, the layer stack including a magnetically hard perpendicular magnetic recording layer structure and an underlying soft magnetic underlayer (SUL), the SUL having a thickness of up to about 100 &#x212b;. Also disclosed is a data/information recording, storage, and retrieval system comprising the perpendicular magnetic recording medium and a single-pole magnetic transducer head including main and auxiliary poles positioned in spaced adjacency to an upper surface of the layer stack, the single-pole transducer head comprising a front shield adjacent the main pole.

Perpendicular magnetic recording media with thin soft magnetic underlayers and recording systems comprising same

A longitudinal magnetic recording medium comprising at least four magnetic layers including a substrate, a CoCrTa magnetic intermediate layer on the substrate, wherein the CoCrTa magnetic intermediate layer comprises Cr&#x3c;16 at % and Ta&#x3c;6 at %, a first CoCrPtB magnetic layer on the CoCrTa layer, wherein the first CoCrPtB magnetic layer comprises Cr: 10-14%, Pt: 4-8 at %, B: 6-10%, a second CoCrPtB magnetic layer on the first CoCrPtB magnetic layer, and a third CoCrPtB magnetic layer on the second CoCrPtB layer, wherein the third CoCrPtB magnetic layer comprises Cr: 12-16 at %, Pt: 12-16 at %, B: 10-14 at % and has &#x3c;10 at % Cr than that in the second CoCrPtB magnetic layer is disclosed.

Method of making a multilayered magnetic structure

High density magnetic recording media

A novel method of manufacturing a longitudinal granular oxide recording medium is disclosed. The method preferably entails obtaining a non-magnetic substrate, heating the substrate at a temperature Tthat is greater than 150&#xb0; C., forming a first layer with body-centered cubic atomic structure and with a &#x3c;200&#x3e; preferred growth orientation, cooling the substrate to a temperature Tand forming a second layer comprising a magnetic oxide-containing granular magnetic layer with a hexagonal close packed atomic structure and with a &#x3c;11-20&#x3e; preferred growth orientation. The magnetic oxide-containing granular magnetic layer contains magnetic crystal grains that are substantially isolated by an inter-granular region comprising a non-magnetic substance, wherein the non-magnetic substance is preferably an oxide-containing material.

Longitudinal magnetic media having a granular magnetic layer

A magnetic recording medium deposited on glass and having an orientation ratio greater than one is disclosed. The magnetic recording medium includes a CoW seedlayer deposited on a circumferentially textured glass substrate. The magnetic recording medium with such a seedlayer can have an OR that is similar or higher than that with a NiP seedlayer. Magnetic recording medium with a CoW seedlayer can produce oriented glass media with orientation ratio OR&#x3e;1 when sputtered on substrates which have been circumferentially textured before the deposition of the CoW seedlayer. The W content of the CoW seedlayer can range between 30-50 at %. The thickness of the CoW seedlayer can range between 10 &#x212b; and 200 &#x212b;. The method for sputter depositing the magnetic recording medium is also disclosed and includes sputter depositing the CoW seedlayer using pure Ar as sputtering gas or using a mixture of Ar and O, HO and Nas sputtering gas.

Magnetic recording media using directly textured glass

A magnetic recording medium including at least one Cu-containing magnetic recording layer (CuML) comprised of a Cu-containing magnetic alloy material selected from the group consisting of:

Magnetic recording media with Cu-containing magnetic layers

A perpendicular magnetic recording medium including an interlayer structure for crystallographically orienting a layer of a hexagonal close-packed (hcp) perpendicular magnetic recording material formed thereon, comprising in overlying sequence from a surface of a magnetically soft underlayer:

Highly oriented perpendicular magnetic recording media

A magnetic recording medium, the order of layers in which is the substrate, the soft underlayer, the seedlayer, the 1RuCr-containing interlayer, the 2RuCr-containing interlayer and the magnetic recording layer with preferably a oxides or nitrides-containing magnetic layer comprising grains, is disclosed. High-chromium ruthenium-chromium alloy used as inter layers significantly enhances coercivity and SMNR preferably due to the improved lattice match between RuCr inter layers and CoPt-based magnetic recording layers, and the surface energy of RuCr layers contributes to the performance improvement with the high-chromium addition into Ru inter layers.

Inter layers for perpendicular recording media

A magnetic recording medium containing a niobium-containing seedlayer having a thickness from about 1 &#x212b; to about 40 &#x212b;, and a method of making the same. The seedlayer provides a recording media with relatively high remanent coercivity and relatively high signal to medium noise ratio.

Niobium alloy seedlayer for magnetic recording media

A magnetic media structure deposited on glass substrates without a NiP layer having oriented media (OR >1), high coercivity and high SMNR is presented. This media will significantly reduce the cost of making high quality media on glass substrates by eliminating the cost associated with additional steps of depositing a NiP layer and texturing that layer. First glass substrates are mechanically textured to have a surface roughness of about 1 &angst; to about 12 &angst;. The first layer of the magnetic structure contains Cr and Ti with a Ti content of 27 to 63 atomic percentage. The second layer contains Co and Ti with a Ti content of 43 to 55 atomic percentage. The third layer is a Cr-alloy layer wherein the alloy is an element chosen from W, Mo, V, Si, Ti, Mn, Ru, B, Nb, Ta, Zr, and Pt. The fourth layer is Co Cr Pt and the fifth layer is Co Cr Pt B . Finally, the protective overcoat is typically a hard material that contains hydrogenated carbon.

System and method for recording media on textured glass

A magnetic recording medium on glass or Al substrates with a film structure of Cr&mdash;X or (Cr&mdash;X)O seedlayer/underlayer/magnetic layer/carbon overcoat, in which the solid solubility of X is at least 3 atomic percent in Cr, the heat of oxide formation of X is less than that of Cr or a lattice tuning capability of X is at least % that of Cr and a manufacturing process thereof are disclosed.

Chromium-alloy seedlayers for recording media

A magnetic recording medium on glass or Al substrates with a film structure of subseedlayer/seedlayer/underlayer/magnetic layer/carbon overcoat, in this order, in which the subseedlayer comprises an element of Group VIb and the seedlayer comprises a material having a B2 structure.

Subseedlayers for magnetic recording media

The present invention provides a longitudinal magnetic recording media having a substrate, optionally, a sputter deposited MgO seed layer, a Co or Co alloy based magnetic layer and an underlayer disposed between the substrate and the magnetic layer comprised of a material having a body centered cubic derivative ordered crystalline structure, preferably a B2, DO or L2 structure. The material may be for example, NiAl, FeAl or Mn Si. A thin Cr or Cr alloy intermediate layer of about 1.0 nm to 5.0 nm thick may be positioned between the underlayer and the magnetic layer.

Structure for and method of making magnetic recording media

A bi-crystal magnetic recording media, i.e., media with Cr(200) and Co(11.0) orientations, comprising non-metallic substrates, CrTi or NiPOx seed layers, B2-structured CoTi first underlayers, Cr-alloy second underlayers, and Co-alloy magnetic layers have high coercivity, high SMNR and high areal recording density.

Growing community of inventors

San Jose, CA, United States of America

Li-Lien Lee