Seagate Technology Incorporated

United Modular Corporation

Yuanda Randy Cheng

Jianzhong Shi

Chung Yuang Shih

Chinsoon Koh

Liji Huang

Connie C Liu

Weilu Hang Xu

Linda Lijun Zhong

Taesun Ernest Kim

Xingbo Yang

Jeff Duane St John

Steve Hwang

Jeffery Lee Petrehn

Yancy Song

Wee Ching Freddy Goh

Darren Soonkeong Ng

Dennis Brown

Kakeng Ling

Stephen Hiroshi Sawasaki

Huitong Ng

Roger Shih

Steven Hiyoshi Sawaski

Kueir Weii Chour

Steven Hiroshi Sawasaki

Xiongwei Ji

Wah Meng John Soh

A novel method of manufacturing a novel recording media is disclosed. The manufacturing method includes obtaining a substrate having an inside diameter and an outside diameter and creating a radial profile of an intensive property, such as Hc, of a multilayer magnetic layer containing at least a first magnetic layer and a second magnetic layer deposited on the substrate, from the inside diameter to the outside diameter by forming a radial profile of an extensive property, such as MrT or T, of either the first magnetic layer or the second magnetic layer from the inside diameter to the outside diameter.

Method to improve coercivity radial profile in magnetic recording media and product thereof

Method and means for enhancing utilization of sputtering targets

Facing target assembly and sputter deposition apparatus

A flash chromium capping layer is deposited on a magnetic layer for improved corrosion resistance, reduced poisoning due to the absence of a protective overcoat or presence of discontinuities in a protective overcoat, and for reduced media noise do to inter-granular exchange coupling. Embodiments include depositing a flash chromium layer having a thickness up to about 10 &angst; on an upper magnetic layer and depositing an overlying lubricant topcoat. An optional protective overcoat, such as a carbon-containing protective overcoat, can also be deposited on the chromium capping layer. The chromium capping layer forms a protective oxide coating where exposed, as due to the absence of or at discontinuities in the protective overcoat.

Magnetic thin film media with chromium capping layer

High areal recording density magnetic recording media with improved signal-to-noise ratio and high thermal stability are formed using oxidized seedlayers to reduce the magnetic grain size and grain size distribution. Embodiments include sputter depositing a NiAl or NiP seedlayer doped with an element having a higher oxidization potential than NiAl or NiP, such as Co or Ti, and oxidizing so that the oxidized dopant element is distributed substantially uniformly throughout the seedlayer to provide increased nucleation sites.

Magnetic recording media with oxidized seedlayer for reduced grain size and reduced grain size distribution

High areal density magnetic recording media exhibiting low noise are formed with a Ni&mdash;P&mdash;X plating layer, in which X is an additive meeting the following requirement: (1) The additive has a higher oxidation potential than that of Ni so that grains of an additive-rich-oxide will form first during oxidation under a controlled atmosphere and grains of a Ni-rich-oxide, if any, will form subsequently and separately from the grains of the additive-rich oxide. (2) The additive has a tendency to segregate to the top surface. (3) The additive is not a catalyst poison for Ni&mdash;P plating in the composition range.

Control of magnetic film grain structure by modifying Ni-P plating of the substrate

A magnetic recording media having a CrMo underlayer provides improved performance characteristics. In one embodiment, the recording media comprises a rigid substrate and an underlayer disposed over the substrate, in which the underlayer comprises CrMo. Preferably, the Mo crystals in the CrMo underlayer are at least about 140 &angst; in the film growth direction for the 002 crystal plane. Advantageously, recording media with such a 002 crystal size, when used in conjunction with a magnetic layer, such as CoCrTaPtNi, exhibits significantly higher parametric qualities than underlayers using other materials. Typically, Mo in the range between about 7% and 16% in the CrMo alloy, more preferably between about 9% and 11%, will provide the recited 002 crystal size.

Magnetic recording media having CrMo underlayers

Growing community of inventors

Singapore, Singapore

Yuanda Randy Cheng