公开(公告)号：US08993133B1

公开(公告)日：2015-03-31

申请号：US12977533

申请日：2010-12-23

申请人： Shaoping Li ,  B. Ramamurthy Acharya

发明人： Shaoping Li ,  B. Ramamurthy Acharya

IPC分类号： G11B5/66 ,  G11B5/706

CPC分类号： G11B5/70626 ,  G11B5/667 ,  G11B5/7325

摘要： A perpendicular magnetic recording (PMR) media including a non-magnetic or superparamagnetic grain isolation magnetic anisotropy layer (GIMAL) to provide a template for initially well-isolated small grain microstructure as well as improvement of Ku in core grains of a magnetic recording layer. The GIMAL composition may be adjusted to have lattice parameters similar to a bottom magnetic recording layer and to provide a buffer for reducing interface strains caused by lattice mismatch between the bottom magnetic recording layer and an underlying layer.

摘要翻译： 包括非磁性或超顺磁性晶粒分离磁各向异性层（GIMAL）的垂直磁记录（PMR）介质，以提供用于初始良好分离的小晶粒微结构的模板以及磁记录层的芯颗粒中的Ku的改进。 可以将GIMAL组合物调整为具有类似于底部磁记录层的晶格参数，并提供用于减少由底部磁记录层和下层之间的晶格失配引起的界面应变的缓冲器。

公开(公告)号：US20120251846A1

公开(公告)日：2012-10-04

申请号：US13077419

申请日：2011-03-31

申请人： Mrugesh Desai ,  Kyongha Kang ,  Jian Zhou ,  B. Ramamurthy Acharya

发明人： Mrugesh Desai ,  Kyongha Kang ,  Jian Zhou ,  B. Ramamurthy Acharya

IPC分类号： G11B5/66 ,  G11B5/673

CPC分类号： G11B5/66 ,  G11B5/65

摘要： A magnetic recording (PMR) disk structure is described. The PMR disk structure may include a magnetic capping layer being substantially free of an oxide, an upper magnetic layer with an oxide content disposed directly below and in contact with the magnetic capping layer, and an upper exchange coupling layer disposed below the upper magnetic layer.

摘要翻译： 描述磁记录（PMR）盘结构。 PMR盘结构可以包括基本上不含氧化物的磁性覆盖层，具有氧化物含量的上部磁性层直接设置在磁性覆盖层的下方并与之接触，以及设置在上部磁性层下方的上部交换耦合层。

公开(公告)号：US20070217074A1

公开(公告)日：2007-09-20

申请号：US11686865

申请日：2007-03-15

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

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

IPC分类号： G11B5/82

CPC分类号： G11B5/82 ,  G11B5/667

摘要： 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.

摘要翻译： 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：US07241517B2

公开(公告)日：2007-07-10

申请号：US10936025

申请日：2004-09-08

申请人： B. Ramamurthy Acharya ,  Akihiro Inomata

发明人： B. Ramamurthy Acharya ,  Akihiro Inomata

IPC分类号： G11B5/66

CPC分类号： G11B5/66 ,  G11B5/656 ,  G11B5/7325 ,  Y10T428/24992

摘要： A magnetic recording medium is constructed to include a lower magnetic layer, a nonmagnetic spacer layer disposed on the lower magnetic layer, and an upper magnetic layer disposed on the nonmagnetic spacer layer, where the upper and lower magnetic layers are antiferromagnetically coupled. The lower magnetic layer comprises a stabilization layer and a lower enhancement layer disposed between the stabilization layer and the nonmagnetic spacer layer, and the stabilization layer and the lower enhancement layer are ferromagnetically exchange coupled. The stabilization layer and the lower enhancement layer are made of CoCr alloys such that a Pt content of the stabilization layer is higher than that of the lower enhancement layer.

摘要翻译： 磁记录介质被构造为包括下磁性层，设置在下磁性层上的非磁性间隔层和设置在非磁性间隔层上的上磁层，其中上磁层和下磁层反铁磁耦合。 下磁性层包括稳定层和设置在稳定层和非磁性间隔层之间的下增强层，并且稳定层和下增强层被铁磁交换耦合。 稳定层和下增强层由CoCr合金制成，使得稳定层的Pt含量高于较低增强层的Pt含量。

公开(公告)号：US06773833B2

公开(公告)日：2004-08-10

申请号：US09809527

申请日：2001-03-15

申请人： Akihiro Inomata ,  E. Noel Abarra ,  B. Ramamurthy Acharya

发明人： Akihiro Inomata ,  E. Noel Abarra ,  B. Ramamurthy Acharya

IPC分类号： G11B566

CPC分类号： 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

摘要： 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.

摘要翻译： 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。