Seagate Technology Incorporated

Julius Kurt Hohlfeld

Bin Lu

William Albert Challener

Ganping Ju

Yukiko A Kubota

Amit Vasant Itagi

Yingguo Peng

Timothy John Klemmer

Chubing Peng

Walter Richard Eppler

Hua Zhou

Xuan Zheng

Duane Clifford Karns

Heidi M Olson

Edward Charles Gage

David S Kuo

Dieter Klaus Weller

Jan-Ulrich Thiele

Xiaomin Yang

Werner Scholz

Robert Earl Rottmayer

Xiaobin Zhu

Kalman Pelhos

Earl Chrzaszcz Johns

Nils Jan Gokemeijer

Christophe Daniel Mihalcea

Jai-Young Kim

Dorothea Buechel

Adnan Rebei

Stanko Radvan Brankovic

A method comprises writing a waveform on a magnetic recording medium using a heat-assisted magnetic recording apparatus which includes a laser. The method also comprises reading back the waveform from the medium, and detecting one or more transition shifts in the readback waveform indicative of a mode hop of the laser. The method further comprises measuring a metric of the one or more transition shifts.

Measuring transition shifts due to laser power variation in a heat-assisted magnetic recording device

The embodiments disclose at least one predetermined patterned layer configured to eliminate a physical path of lateral thermal bloom in a recording device, at least one gradient layer coupled to the patterned layer and configured to use materials with predetermined thermal conductivity for controlling a rate of dissipation and a path coupled to the gradient layer and configured to create a path of least thermal conduction resistance for directing dissipation along the path, wherein the path substantially regulates and prevents lateral thermal bloom.

Patterned heat sink layer for eliminating lateral thermal bloom

An apparatus includes a non-metallic interlayer between a magnetic data storage layer and a heat sink layer, wherein interface thermal resistance between the interlayer and the heat sink layer is capable of reducing heat flow between the heat sink layer and the magnetic data storage layer. The apparatus may be configured as a thin film structure arranged for data storage. The apparatus may also include thermal resistor layer positioned between the interlayer and the heat sink layer.

Thin film structure with controlled lateral thermal spreading in the thin film

An apparatus includes a magnetic layer, a heat sink layer, and a thermal resistor layer between the magnetic layer and the heat sink layer. The apparatus may be configured as a thin film structure arranged for data storage. The apparatus may also include an interlayer positioned between the magnetic layer and the thermal resistor layer.

In a particular embodiment, an optical transducer includes at least three optically conductive blades arranged symmetrically about a center gap. The optical transducer is adapted to receive polarized light from a light source and to focus the polarized light onto a recording medium while conserving polarization of the polarized light.

Polarization near-field transducer having optical conductive blades

An apparatus comprises a waveguide, an optical transducer for coupling electromagnetic radiation from the waveguide to a point adjacent to an air bearing surface to heat a portion of a storage medium, and a first wire positioned adjacent to the air bearing surface, wherein current in the wire produces a magnetic field in the heated portion of the storage medium.

Dual wire integrated WAMR/HAMR writing head

Metal alloy heatsink films for magnetic recording media are disclosed. The metal alloy heatsink films possess both high thermal conductivity and improved mechanical properties such as relatively high hardness. The metal alloy heatsink films also have controlled microstructures which are compatible with subsequently deposited crystalline magnetic recording layers. The films may comprise single phase CuZr or AgPd alloys having a selected crystal structure and orientation. The combination of high thermal conductivity, good mechanical properties and controlled microstructures makes the metal alloy heatsink films suitable for various applications including heat assisted magnetic recording systems.

Heatsink films for magnetic recording media

Patterned thin films comprise regions of relatively low thermal conductivity material separated by regions of relatively high thermal conductivity material. The low thermal conductivity regions may be provided in the form of cylinders or cuboids which are arranged in a continuous matrix of the high thermal conductivity material. The thin film may be used as thermal control layers in data recording media such as heat assisted magnetic recording media.

Patterned thin films and use of such films as thermal control layers in heat assisted magnetic recording media

A transducer comprises a conductive pin and a waveguide for directing electromagnetic radiation onto the pin, wherein the pin is configured to create a rectangular flat top field distribution at a surface of a storage medium positioned adjacent to an end of the pin, leading to a flat top thermal profile within the storage medium. A second pin can be included in the transducer. Recording heads that include the transducer, disc drives that include the recording head, and a method of heating a portion of a storage medium that is performed by the recording head, are also included.

Heat assisted magnetic recording with heat profile shaping

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Wexford, PA, United States of America

Julius Kurt Hohlfeld