公开(公告)号：US07264892B2

公开(公告)日：2007-09-04

申请号：US10936005

申请日：2004-09-08

Applicant: Antony Ajan ,  Akihiro Inomata ,  E. Noel Abarra ,  B. Ramamurthy Acharya

Inventor： Antony Ajan ,  Akihiro Inomata ,  E. Noel Abarra ,  B. Ramamurthy Acharya

IPC: G11B5/66

CPC classification number: G11B5/732 ,  G11B5/012 ,  G11B5/656 ,  G11B5/66 ,  G11B5/7325 ,  Y10T428/265

Abstract: A magnetic recording medium includes a substrate, a magnetic recording layer made of a Co alloy or a CoCr alloy, a seed layer disposed between the substrate and the magnetic recording layer, and an underlayer made of a binary alloy material having a B2 structure and disposed between the seed layer and the magnetic recording layer. The seed layer is made of a material comprising essentially of one of elements forming the binary alloy material of the underlayer.

Abstract translation: 磁记录介质包括基板，由Co合金或CoCr合金制成的磁记录层，设置在基板和磁记录层之间的种子层，以及由具有B2结构的二元合金材料制成的底层 在种子层和磁记录层之间。 种子层由基本上由形成底层的二元合金材料的元素之一组成的材料制成。

公开(公告)号：US20130022842A1

公开(公告)日：2013-01-24

申请号：US13620324

申请日：2012-09-14

Applicant: Jianing Zhou ,  B. Ramamurthy Acharya ,  E. Noel Abarra ,  Gunn Choe

Inventor： Jianing Zhou ,  B. Ramamurthy Acharya ,  E. Noel Abarra ,  Gunn Choe

IPC: G11B5/667

CPC classification number: G11B5/82 ,  G11B5/667

Abstract: A perpendicular recording medium having a perpendicular magnetic recording layer and a magnetically soft underlayer structure disposed beneath the recording layer. The soft underlayer structure includes at least first and second soft magnetic layers having different magnetic permeabilities to create a magnetic permeability gradient in the soft underlayer structure. One or more of the soft magnetic layers can be antiparallel coupled. The soft underlayer structure of the present invention having a magnetic permeability gradient advantageously leads to reduced adjacent track erasure (ATE) while maintaining good overwrite (OW) properties.

Abstract translation: 一种垂直记录介质，其具有设置在记录层下方的垂直磁记录层和磁软底层结构。 软底层结构包括至少具有不同磁导率的第一和第二软磁层，以在软底层结构中产生磁导率梯度。 一个或多个软磁层可以是反平行耦合的。 具有磁导率梯度的本发明的软底层结构有利地导致减少的相邻轨迹擦除（ATE），同时保持良好的重写（OW）特性。

公开(公告)号：US08277962B2

公开(公告)日：2012-10-02

申请号：US12879849

申请日：2010-09-10

Applicant: Jianing Zhou ,  B. Ramamurthy Acharya ,  E. Noel Abarra ,  Gunn Choe

Inventor： Jianing Zhou ,  B. Ramamurthy Acharya ,  E. Noel Abarra ,  Gunn Choe

IPC: G11B5/82

CPC classification number: G11B5/82 ,  G11B5/667

Abstract: A perpendicular recording medium having a perpendicular magnetic recording layer and a magnetically soft underlayer structure disposed beneath the recording layer. The soft underlayer structure includes at least first and second soft magnetic layers having different magnetic permeabilities to create a magnetic permeability gradient in the soft underlayer structure. One or more of the soft magnetic layers can be anti-parallel coupled. The soft underlayer structure of the present invention having a magnetic permeability gradient advantageously leads to reduced adjacent track erasure (ATE) while maintaining good overwrite (OW) properties.

Abstract translation: 一种垂直记录介质，其具有设置在记录层下方的垂直磁记录层和磁软底层结构。 软底层结构包括至少具有不同磁导率的第一和第二软磁层，以在软底层结构中产生磁导率梯度。 一个或多个软磁性层可以是反平行耦合的。 具有磁导率梯度的本发明的软底层结构有利地导致减少的相邻轨迹擦除（ATE），同时保持良好的重写（OW）特性。

公开(公告)号：US20100328818A1

公开(公告)日：2010-12-30

申请号：US12879849

申请日：2010-09-10

Applicant: Jianing Zhou ,  B. Ramamurthy Acharya ,  E. Noel Abarra ,  Gunn Choe

Inventor： Jianing Zhou ,  B. Ramamurthy Acharya ,  E. Noel Abarra ,  Gunn Choe

IPC: G11B5/82

CPC classification number: G11B5/82 ,  G11B5/667

Abstract: A perpendicular recording medium having a perpendicular magnetic recording layer and a magnetically soft underlayer structure disposed beneath the recording layer. The soft underlayer structure includes at least first and second soft magnetic layers having different magnetic permeabilities to create a magnetic permeability gradient in the soft underlayer structure. One or more of the soft magnetic layers can be anti-parallel coupled. The soft underlayer structure of the present invention having a magnetic permeability gradient advantageously leads to reduced adjacent track erasure (ATE) while maintaining good overwrite (OW) properties.

Abstract translation: 一种垂直记录介质，其具有设置在记录层下方的垂直磁记录层和磁软底层结构。 软底层结构包括至少具有不同磁导率的第一和第二软磁层，以在软底层结构中产生磁导率梯度。 一个或多个软磁性层可以是反平行耦合的。 具有磁导率梯度的本发明的软底层结构有利地导致减少的相邻轨迹擦除（ATE），同时保持良好的重写（OW）特性。

公开(公告)号：US06893735B2

公开(公告)日：2005-05-17

申请号：US10444107

申请日：2003-05-22

Applicant: B. Ramamurthy Acharya ,  E. Noel Abarra

Inventor： B. Ramamurthy Acharya ,  E. Noel Abarra

IPC: G11B5/65 ,  G11B5/00 ,  G11B5/012 ,  G11B5/64 ,  G11B5/66 ,  G11B5/738 ,  G11B5/74 ,  G11B5/82 ,  G11B5/673

CPC classification number: G11B5/656 ,  G11B5/00 ,  G11B5/012 ,  G11B5/66 ,  G11B5/74 ,  G11B5/82 ,  G11B2005/0002 ,  G11B2005/0005 ,  Y10T428/12465 ,  Y10T428/12861 ,  Y10T428/12868 ,  Y10T428/12931

Abstract: A magnetic recording medium includes a nonmagnetic underlayer, an initial magnetic layer, a nonmagnetic spacer layer provided on the initial magnetic layer, and a final magnetic layer provided on the nonmagnetic spacer layer. The initial magnetic layer is disposed closer to the nonmagnetic underlayer than the final magnetic layer, and the initial and final magnetic layers are made of mutually different compositions and are anti-ferromagnetically coupled.

Abstract translation: 磁记录介质包括非磁性底层，初始磁性层，设置在初始磁性层上的非磁性间隔层，以及设置在非磁性间隔层上的最终磁性层。 初始磁性层被设置成比最终的磁性层更靠近非磁性底层，并且初始和最终的磁性层由相互不同的组成制成并且是反铁磁耦合的。

公开(公告)号：US20070217074A1

公开(公告)日：2007-09-20

申请号：US11686865

申请日：2007-03-15

Applicant: Jianing Zhou ,  B. Ramamurthy Acharya ,  E. Noel Abarra ,  Gunn Choe

Inventor： Jianing Zhou ,  B. Ramamurthy Acharya ,  E. Noel Abarra ,  Gunn Choe

IPC: G11B5/82

CPC classification number: G11B5/82 ,  G11B5/667

Abstract: A perpendicular recording medium having a perpendicular magnetic recording layer and a magnetically soft underlayer structure disposed beneath the recording layer. The soft underlayer structure includes at least first and second soft magnetic layers having different magnetic permeabilities to create a magnetic permeability gradient in the soft underlayer structure. One or more of the soft magnetic layers can be anti-parallel coupled. The soft underlayer structure of the present invention having a magnetic permeability gradient advantageously leads to reduced adjacent track erasure (ATE) while maintaining good overwrite (OW) properties.

Abstract translation: 一种垂直记录介质，其具有设置在记录层下方的垂直磁记录层和磁软底层结构。 软底层结构包括至少具有不同磁导率的第一和第二软磁层，以在软底层结构中产生磁导率梯度。 一个或多个软磁性层可以是反平行耦合的。 具有磁导率梯度的本发明的软底层结构有利地导致减少的相邻轨迹擦除（ATE），同时保持良好的重写（OW）特性。

公开(公告)号：US06773833B2

公开(公告)日：2004-08-10

申请号：US09809527

申请日：2001-03-15

Applicant: Akihiro Inomata ,  E. Noel Abarra ,  B. Ramamurthy Acharya

Inventor： Akihiro Inomata ,  E. Noel Abarra ,  B. Ramamurthy Acharya

IPC: G11B566

CPC classification number: B82Y25/00 ,  G11B5/012 ,  G11B5/66 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11C11/16 ,  H01F10/3272 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/24942 ,  Y10T428/2495 ,  Y10T428/265

Abstract: A magnetic storage medium includes first and second magnetic layers provided on a support substrate such that the first and second magnetic layers have respective first and second magnetizations in an anti-parallel relationship in a state no substantial writing magnetic field is applied. The first and second magnetizations are changed to a parallel relationship when a writing magnetic field is applied to the magnetic storage medium, and the first and second magnetizations are changed to the anti-parallel relationship as a result of a magnetic reversal caused in the second magnetic layer with diminishing of the writing magnetic field. The reversal is caused as a result of the action of a reversing magnetic field that dominates before the writing magnetic field is diminished and becomes zero.

Abstract translation: 磁存储介质包括设置在支撑基板上的第一和第二磁性层，使得第一和第二磁性层在不施加实质写入磁场的状态下具有反并联关系的相应的第一和第二磁化。 当写入磁场施加到磁存储介质时，第一和第二磁化被改变为平行关系，并且由于在第二磁场中引起的磁反转的结果，第一和第二磁化被改变为反并联关系 写入磁场减小的层。 由于在写入磁场减小并成为零之前主导的反转磁场的作用导致反转。

公开(公告)号：US09005781B2

公开(公告)日：2015-04-14

申请号：US13620324

申请日：2012-09-14

Applicant: Jianing Zhou ,  B. Ramamurthy Acharya ,  E. Noel Abarra ,  Gunn Choe

Inventor： Jianing Zhou ,  B. Ramamurthy Acharya ,  E. Noel Abarra ,  Gunn Choe

IPC: G11B5/667 ,  G11B5/82

CPC classification number: G11B5/82 ,  G11B5/667

Abstract: A perpendicular recording medium having a perpendicular magnetic recording layer and a magnetically soft underlayer structure disposed beneath the recording layer. The soft underlayer structure includes at least first and second soft magnetic layers having different magnetic permeabilities to create a magnetic permeability gradient in the soft underlayer structure. One or more of the soft magnetic layers can be antiparallel coupled. The soft underlayer structure of the present invention having a magnetic permeability gradient advantageously leads to reduced adjacent track erasure (ATE) while maintaining good overwrite (OW) properties.

Abstract translation: 一种垂直记录介质，其具有设置在记录层下方的垂直磁记录层和磁软底层结构。 软底层结构包括至少具有不同磁导率的第一和第二软磁层，以在软底层结构中产生磁导率梯度。 一个或多个软磁层可以是反平行耦合的。 具有磁导率梯度的本发明的软底层结构有利地导致减少的相邻轨迹擦除（ATE），同时保持良好的重写（OW）特性。

公开(公告)号：US08110298B1

公开(公告)日：2012-02-07

申请号：US11367821

申请日：2006-03-03

Applicant: Gunn Choe ,  B. Ramamurthy Acharya ,  Min Zheng ,  E. Noel Abarra

Inventor： Gunn Choe ,  B. Ramamurthy Acharya ,  Min Zheng ,  E. Noel Abarra

IPC: G11B5/66

CPC classification number: G11B5/66 ,  G11B5/65

Abstract: Perpendicular magnetic recording media having a magnetic capping layer that is exchange coupled to an underlying perpendicular magnetic recording layer. The magnetic coupling layer is a granular layer having a high saturation magnetization (Ms). The perpendicular magnetic recording layer can include magnetic grains separated by an oxide grain boundary phase.

Abstract translation: 具有磁性覆盖层的垂直磁记录介质，其交换耦合到下面的垂直磁记录层。 磁耦合层是具有高饱和磁化强度（Ms）的粒状层。 垂直磁记录层可以包括由氧化物晶界相分离的磁性颗粒。

公开(公告)号：US07901802B2

公开(公告)日：2011-03-08

申请号：US11686865

申请日：2007-03-15

Applicant: Jianing Zhou ,  B. Ramamurthy Acharya ,  E. Noel Abarra ,  Gunn Choe

Inventor： Jianing Zhou ,  B. Ramamurthy Acharya ,  E. Noel Abarra ,  Gunn Choe

IPC: G11B5/82

CPC classification number: G11B5/82 ,  G11B5/667

Abstract: A perpendicular recording medium having a perpendicular magnetic recording layer and a magnetically soft underlayer structure disposed beneath the recording layer. The soft underlayer structure includes at least first and second soft magnetic layers having different magnetic permeabilities to create a magnetic permeability gradient in the soft underlayer structure. One or more of the soft magnetic layers can be anti-parallel coupled. The soft underlayer structure of the present invention having a magnetic permeability gradient advantageously leads to reduced adjacent track erasure (ATE) while maintaining good overwrite (OW) properties.

Abstract translation: 一种垂直记录介质，其具有设置在记录层下方的垂直磁记录层和磁软底层结构。 软底层结构包括至少具有不同磁导率的第一和第二软磁层，以在软底层结构中产生磁导率梯度。 一个或多个软磁性层可以是反平行耦合的。 具有磁导率梯度的本发明的软底层结构有利地导致减少的相邻轨迹擦除（ATE），同时保持良好的重写（OW）特性。