公开(公告)号：US10134446B1

公开(公告)日：2018-11-20

申请号：US15918269

申请日：2018-03-12

Applicant: Seagate Technology LLC

Inventor： Kangkang Wang ,  Xiaobin Zhu ,  Ganping Ju ,  Kai Chieh Chang ,  Yingguo Peng ,  Timothy J. Klemmer ,  Jan-Ulrich Thiele ,  Pin-Wei Huang

IPC: G11B27/36 ,  G11B7/1267 ,  G11B5/024 ,  G11B5/09 ,  G11B7/1263 ,  G11B5/455 ,  G01R33/032 ,  G11B5/00

Abstract: 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.

公开(公告)号：US09984709B1

公开(公告)日：2018-05-29

申请号：US15466798

申请日：2017-03-22

Applicant: Seagate Technology LLC

Inventor： Pin-Wei Huang ,  YinFeng Ding ,  YingGuo Peng ,  Xiaobin Zhu ,  Kai-Chieh Chang ,  Yukiko Kubota ,  Timothy J. Klemmer ,  QiHong Wu ,  Ganping Ju ,  Jan-Ulrich Thiele ,  Florin Zavaliche

IPC: G11B11/00 ,  G11B5/66 ,  G11B5/65 ,  G11B5/00 ,  G11B7/126 ,  G11B5/60

CPC classification number: G11B5/66 ,  G11B5/6088 ,  G11B7/126 ,  G11B2005/0021

Abstract: An apparatus is disclosed. The apparatus includes a storage layer, a thermal exchange control layer disposed over the storage layer, and a write layer disposed over the thermal exchange control layer. A Curie temperature of the thermal exchange control layer is lower than a Curie temperature of the storage layer. The Curie temperature of the thermal exchange control layer is lower than a Curie temperature of the write layer.

公开(公告)号：US09697857B1

公开(公告)日：2017-07-04

申请号：US15165637

申请日：2016-05-26

Applicant: Seagate Technology LLC

Inventor： Joachim Ahner ,  David M. Tung ,  Ganping Ju ,  Philip L. Steiner ,  Thomas P. Nolan ,  Thomas Y. Chang ,  Pin-Wei Huang ,  Kaizhong Gao ,  Timothy Klemmer ,  David S. Kuo

IPC: G11B11/00 ,  G11B5/66 ,  G11B5/65 ,  G11B5/00

CPC classification number: G11B5/66 ,  G11B5/02 ,  G11B2005/0021 ,  G11B2005/0024

Abstract: A three dimensional magnetic recording media can consist of a coupling layer disposed between first and second vertically stacked recording layers. The coupling layer can provide exchange or antiferromagnetic coupling and allow the respective recording layers to be individually heat selected to different first and second coupling strengths through application of heat from a heat source.