Seagate Technology Incorporated

The Bank of Nova Scotia, As Administrative Agent

Alexander Yulievich Dobin

Erol Girt

Hans Juergen Richter

Abebe Hailu

David S Kuo

Dieter Klaus Weller

Thomas P Nolan

Samuel Dacke Harkness, Iv

Yingguo Peng

Yukiko A Kubota

Charles Changging Chen

Charles Frederick Brucker

Weilu Hang Xu

Thomas Francis Ambrose

Shih-Fu Lee

Zhong (Stella) Wu

Miaogen Lu

Bogdan Florin Valcu

Shoutao Wang

Bo Bian

Dave M Tung

A perpendicular magnetic recording layer of a magnetic recording medium includes a plurality of bit-patterned magnetic islands, wherein each of the plurality of islands overlay a soft magnetic under-layer. Each of the magnetic islands includes a first magnetic sub-layer adjacent a second magnetic sub-layer, wherein the first sub-layer has a relatively high magnetic anisotropy that is greater than a magnetic anisotropy of the second sub-layer. The magnetic recording layer further includes a third sub-layer, which extends to connect each of the plurality of islands. The third sub-layer may have a magnetic anisotropy that is less than that of the second sub-layer of each of the magnetic islands and/or may serve as an interlayer, extending between the first sub-layer and the soft magnetic under-layer of the recording medium, and having a structure to help to produce the greater anisotropy first magnetic sub-layer.

Magnetic layering for bit-patterned stack

A bit patterned magnetic recording medium, comprises a non-magnetic substrate having a surface; a plurality of spaced apart magnetic elements on the surface, each of the elements constituting a discrete magnetic domain or bit; and a layer of a ferromagnetic material for regulating magnetic exchange coupling between said magnetic elements. The layer has a saturation magnetization Mranging from about 1 to about 2,000 emu/cm, preferably below about 400 emu/cm, more preferably below about 200 emu/cm, and may overlie, underlie, or at least partially fill spaces between adjacent magnetic elements.

Bit patterned magnetic media

Aspects are directed to recording media with enhanced magnetic properties for improved writability. Examples can be included or related to methods, systems and components that allow for improved writability while reducing defects so as to obtain uniform magnetic properties such as uniformly high anisotropy and narrow switching field distribution. Some examples include a recording medium with an exchange tuning layer inserted between the hard layer and the soft, semi-soft or thin semi-hard layer so as to maximize the writability improvement of the media. Preferably, the exchange tuning layer is granular and reduces or optimizes the vertical coupling between the hard layer and the soft, semi-soft or semi-hard layer of a magnetic recording or storing device.

Magnetic recording media with enhanced writability and thermal stability

A method of performing data/information recording and retrieval utilizing a multilevel patterned magnetic medium, comprises providing a magnetic recording system including a read/write head and a multilevel patterned magnetic recording medium including a plurality of spaced apart data/information storage elements each comprising a stacked plurality n of magnetic recording cells with different magnetic properties and magnetically decoupled from overlying and/or underlying cells; providing relative movement between the write head and magnetic recording medium; and writing to the medium by supplying the write head with a modulated write current comprising a plurality n of pulses of different magnitudes while the head passes over each element, thereby applying n different magnetic field strengths to each element, such that the writing occurs in a single pass of the write head over each element.

Single-pass recording of multilevel patterned media

Systems and methods are provided for correcting write synchronization of a magnetic storage device with respect to magnetic storage media and its corresponding writable magnetic bits, or dots. In particular, these systems and methods involve using time-shifting principles to calibrate the magnetic storage devices to correct slow drifts of reader-writer timing. It is to be appreciated that time-shifting techniques can be applied in a variety of manners. For example, the very dots on the media can be positioned in time-shifted fashion. In another example, the writing to the dots can be time-shifted.

Time-shifted bits for write synchronization correction

A granular perpendicular magnetic recording medium comprises a non-magnetic substrate and a granular perpendicular magnetic recording layer overlying the substrate, comprising a first granular perpendicular magnetic layer proximal the substrate and having a first saturation magnetization (M), and a second granular perpendicular magnetic layer distal the substrate and having a second, different saturation magnetization (M). Also disclosed is a method of fabricating the granular perpendicular magnetic recording medium.

Granular perpendicular magnetic recording media with dual recording layer and method of fabricating same

A magnetic recording medium having a first magnetic layer, a spacer layer, and a second magnetic layer, in this order, wherein the spacer layer includes a non-magnetic layer and a thickness of the spacer layer is selected to establish anti-ferromagnetic coupling between the first magnetic layer and the second magnetic layer, and a thickness of both the first and second magnetic layers are less than a critical thickness for formation of stripe domains in the magnetic layers is disclosed.

Anti-ferromagnetically coupled soft underlayer

Growing community of inventors

Milpitas, CA, United States of America

Alexander Yulievich Dobin