Seagate Technology Incorporated

Uchicago Argonne, LLC

Kangkang Wang

Ganping Ju

Jan-Ulrich Thiele

Yingguo Peng

Timothy John Klemmer

Xiaobin Zhu

Kai Chieh Chang

Yukiko A Kubota

Yinfeng Ding

Li Gao

David S Kuo

Xi Chen

Pin-Wei Huang

Kai-Chieh Chang

Edward Charles Gage

Thomas P Nolan

Curt Alfred Preissner

Volker Rose

Saw-Wai Hla

Daniel Rosenmann

An apparatus comprises a magnet housing dimensioned to receive a heat-assisted magnetic recording (HAMR) medium or a hard disk drive comprising at least one HAMR medium. A degausser is disposed in the magnet housing and is configured to generate at least one field sufficient to erase the HAMR medium, where the HAMR medium has a coercivity of between about 20 and 100 kOe at room temperature.

Method and apparatus for degaussing heat-assisted magnetic recording media

An apparatus comprises a spindle to rotate a magnetic recording medium and a magnetic field generator to expose a track of the medium to a DC magnetic field. The magnetic field generator is configured to saturate the track during an erase mode and reverse the DC magnetic field impinging the track during a writing mode. A laser arrangement heats the track during the erase mode and, during the writing mode, heats the track while the track is exposed to the reversed DC magnetic field so as to write a magnetic pattern thereon. A reader reads the magnetic pattern and generates a read signal. A processor is coupled to the reader and configured to determine an anisotropy parameter using the read signal. The apparatus can further comprise a Kerr sensor that generates a Kerr signal using the magnetic pattern.

Heat-assisted rotating disk magnetometer for ultra-high anisotropy magnetic measurements

A stack includes a substrate, a magnetic recording layer comprising FePtX disposed over the substrate, and a capping layer disposed on the magnetic recording layer. The capping layer comprises Co; at least one rare earth element; one or more elements selected from a group consisting of Fe and Pt; and an amorphizing agent comprising one to three elements selected from a group consisting of B, Zr, Ta, Cr, Nb, W, V, and Mo.

Capping layer for magnetic recording stack

An apparatus comprises a spindle to rotate a magnetic recording medium and a magnetic field generator to expose a track of the medium to a DC magnetic field. The magnetic field generator is configured to saturate the track during an erase mode and reverse the DC magnetic field impinging the track during a writing mode. A laser arrangement heats the track during the erase mode and, during the writing mode, heats the track while the track is exposed to the reversed DC magnetic field so as to write a magnetic pattern thereon. A reader reads the magnetic pattern and generates a read signal. A processor is coupled to the reader and configured to measure one or more magnetic properties of the track using the read signal. The apparatus can further comprise a Kerr sensor that generates a Kerr signal using the magnetic pattern.

Provided herein is an apparatus comprising a substrate; a continuous layer over the substrate comprising a first heat sink layer; and a plurality of features over the continuous layer comprising a second heat sink layer, a first magnetic layer over the second heat sink layer, and a second magnetic layer, wherein the first and second magnetic layers are configured to provide a temperature-dependent, exchange spring mechanism.

Apparatus including temperature-dependent exchange spring mechanism

The embodiments disclose a patterned composite magnetic layer structure configured to use magnetic materials having differing temperature and magnetization characteristics in a recording device, wherein the patterned composite magnetic layer structure includes magnetic layers, at least one first magnetic material configured to be used in a particular order to reduce a recording temperature and configured to control and regulate coupling and decoupling of the magnetic layers and at least one second magnetic material with differing temperature characteristics is configured to control recording and erasing of data.

Composite magnetic recording structure for heat assisted magnetic recording device

A method and system for performing simultaneous topographic and elemental chemical and magnetic contrast analysis in a scanning, tunneling microscope. The method and system also includes nanofabricated coaxial multilayer tips with a nanoscale conducting apex and a programmable in-situ nanomanipulator to fabricate these tips and also to rotate tips controllably.

Simultaneous topographic and elemental chemical and magnetic contrast in scanning tunneling microscopy

Growing community of inventors

Fremont, CA, United States of America

Kangkang Wang