Seagate Technology Incorporated

Synopsys, Inc.

Lin Huang

Rajiv Yadav Ranjan

Charles Chengyea Leu

Qixu David Chen

Qixu (David) Chen

Liji Huang

Connie C Liu

Ian J Beresford

Joseph Leigh

Zhong (Stella) Wu

Samuel Dacke Harkness

Linda Lijun Zhong

David E Brown

Chung Yuang Shih

Kuo-Hsing Hwang

Kueir-Weei Chour

Jie-Ming Yu

Huaming Hu

Qixu(David) Chen

A scan chain planning method uses physical data with a hierarchical design to optimize chip level scan chains. Specifically, location data of physical blocks is used to determine optimal partitioning of the hierarchical design to balance chip level scan chains and reduce the number block scan ports by determining optimal locations for the block scan ports. Actual layout of the scan chains is based on the locations of the block scan ports and the number of scan elements determined by the method for each block scan chain.

Chip level scan chain planning for hierarchical design flows

Ultra smooth as-deposited composite nickel coatings for use in an information storage system are provided. The composite nickel coatings include an electrolessly deposited nickel layer formed on a sputter deposited nickel layer. The composite nickel coatings have an as-deposited surface roughness of less than about 10 &#x212b;. Embodiments include formation of the composite nickel coating on a disk, followed by deposition of an underlayer and magnetic layer thereon to form a magnetic recording medium.

Using plated surface for recording media without polishing

A magnetic recording media is formed with high in-plane coercivity employing dual magnetic layers. The first magnetic layer is sputter deposited in a chamber employing a shield such that the minimum incident angle of impinging atoms is relatively large, e.g., greater than about 26&deg;. Embodiments of the present invention comprise depositing a NiAl seedlayer, a Cr or Cr alloy underlayer and a first CoCrTa magnetic layer at a thickness less than about 50 &angst; for inducing the preferred (10.0) crystallographic orientation in the subsequently deposited second magnetic layer, e.g., CoCrPtTa or CoCrPtTaNb having a high Cr content of about 16 to about 21 at. %.

Magnetic recording medium with dual magnetic layers and high in-plane coercivity

Ultra smooth as-deposited composite nickel coatings for use in an information storage system are provided. The composite nickel coatings include an electrolessly deposited nickel layer formed on a sputter deposited nickel layer. The composite nickel coatings have an as-deposited surface roughness of less than about 10 &angst;. Embodiments include formation of the composite nickel coating on a disk, followed by deposition of an underlayer and magnetic layer thereon to form a magnetic recording medium.

A magnetic recording medium is provided with a dual layer protective overcoat system comprising a SiC corrosion barrier layer and a carbon-containing protective overcoat thereon. The SiC layer effectively prevents or significantly reduces Co and Ni diffusion to the medium surface. Embodiments include magnetic recording media comprising a SiC corrosion barrier layer over a magnetic layer, an overlying protective layer of amorphous hydrogenated carbon, amorphous nitrogenated carbon or amorphous hydrogen-nitrogenated carbon, and a lubricant topcoat thereon. Embodiments of the present invention further include magnetic recording media comprising Ni&mdash;P plated aluminum, Ni-plated glass or non-conductive substrates including glass, glass-ceramic and ceramic materials. Embodiments of the present invention further include a dual protective overcoat system having a combined thickness less than about 100 &angst;, such as less than about 75 &angst;, e.g., less than about 50 &angst;, with the SiC corrosion barrier layer having a thickness ranging from 1 &angst; to 40 &angst;.

Magnetic recording media comprising a silicon carbide corrosion barrier layer and a c-overcoat

A magnetic recording medium on glass or Al substrates with film structures of CrV/NiAl/CrMo/CoCrTa/CoCrPtTaNbB and CrMo/CoCrTa/CoCrPtTaNbB exhibit high coercivity and high signal-to-medium noise ratio. The medium can be used for high-density longitudinal magnetic recording. Embodiments include forming a sub-seed layer on a NiP-plated aluminum substrate, and sequentially depositing a seed layer, an underlayer, an intermediate layer and a magnetic layer on the substrate. The magnetic layer contains at least six elements, including Co, Cr and B.

CoCrPtTaNbB alloy for magnetic recording medium

A magnetic recording media is formed with high in-plane coercivity employing dual magnetic layers. The first magnetic layer is sputter deposited in a chamber employing a shield such that the minimum incident angle of impinging atoms is relatively large, e.g., greater than about 26&deg;. Embodiments of the present invention comprise depositing a NiAl seedlayer, a Cr or Cr alloy underlayer and a first CoCrTa magnetic layer at a thickness less than about 50&angst; for inducing the preferred (10.0) crystallographic orientation in the subsequently deposited second magnetic layer, e.g., CoCrPtTa or CoCrPtTaNb having a high Cr content of about 16 to about 21 at. %.

Sputter-deposited amorphous metal oxide films on substrates comprising an aluminum-containing support and a Ni-containing pre-coat reduce Ni ion migration significantly from the substrate onto the top surface of the magnetic recording media. Longitudinal magnetic recording media deposited on metal oxide sealing layers have very good magnetic recording performances and are suitable for high density recording application.

Media with a metal oxide sealing layer

A magnetic recording medium on glass or Al substrates with film structure of NiAl seed layer/CrMo underlayer/CoCrPtB magnetic layer/carbon overcoat, in which the magnetic layer has a substantially (10.0) crystallographic orientation, exhibits high coercivity, high signal-to-medium noise ratio and low transition jitter. The medium can be used for high-density longitudinal magnetic recording. Embodiments include forming a surface oxidized NiAl sub-seed layer on a glass or glass-ceramic substrate, and sequentially depositing a seed layer of NiAl, an underlayer of Cr or Cr-alloy, such as CrMo, and a CoCrPtB magnetic layer.

CoCrPtB medium with a 1010 crystallographic orientation

Sputter-deposited TiW film interposed between a magnetic layer and a nitrogen-containing overcoat of a magnetic recording medium significantly reduces the migration of nitrogen from the overcoat to the magnetic layer, thereby improving the magnetic recording performances of the magnetic recording medium.

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San Jose, CA, United States of America

Lin Huang