公开(公告)号：US20100328818A1

公开(公告)日：2010-12-30

申请号：US12879849

申请日：2010-09-10

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：US07592079B1

公开(公告)日：2009-09-22

申请号：US10884789

申请日：2004-07-01

申请人： B. Ramamurthy Acharya ,  Gunn Choe

发明人： B. Ramamurthy Acharya ,  Gunn Choe

IPC分类号： G11B5/66

CPC分类号： G11B5/66

摘要： A magnetic disk for information storage that includes a substrate and an information layer for containing information. The information layer includes a upper (e.g., recording) and lower (e.g., stabilizing) layers. The information layer has a remanence-squareness-thickness-product (“Mrt”) that varies radially between first and second disk radii. At least one of the following conditions is true: (i) the information layer has a coercivity that is at least substantially constant between the first and second disk radii; (ii) the lower magnetic layer has a magnetic anisotropy energy of no more than about 1.5×106 erg/cm3; and (iii) the magnetic anisotropy energy of the upper magnetic layer is at least about 150% of the magnetic anisotropy energy of the lower magnetic layer.

摘要翻译： 一种用于信息存储的磁盘，其包括基板和用于容纳信息的信息层。 信息层包括上（例如，记录）和下（例如稳定）层。 信息层具有在第一和第二盘半径之间径向变化的剩磁平方厚度乘积（“Mrt”）。 以下条件中的至少一个是真实的：（i）信息层具有在第一和第二盘半径之间至少基本恒定的矫顽力; （ii）下磁性层的磁各向异性能量不超过约1.5×10 6 erg / cm 3; 和（iii）上部磁性层的磁各向异性能量为下部磁性层的磁各向异性能的至少约150％。

公开(公告)号：US07241516B1

公开(公告)日：2007-07-10

申请号：US10792328

申请日：2004-03-03

申请人： B. Ramamurthy Acharya ,  Jianing Zhou ,  Gunn Choe ,  Min Zheng

发明人： B. Ramamurthy Acharya ,  Jianing Zhou ,  Gunn Choe ,  Min Zheng

IPC分类号： G11B5/66 ,  G11B5/70

CPC分类号： G11B5/667

摘要： An improved soft underlayer structure for perpendicular magnetic recording. The structure includes at least two soft underlayers separated by a non-magnetic spacer layer. The soft underlayer structure incorporates exchange coupling induced anisotropy for improved perpendicular magnetic recording properties, including an improved signal-to-noise ratio (SNR) and reduced adjacent track erasure.

摘要翻译： 用于垂直磁记录的改进的软底层结构。 该结构包括由非磁性间隔层隔开的至少两个软底层。 软底层结构包含交换耦合诱导各向异性以改善垂直磁记录性能，包括改进的信噪比（SNR）和减少的相邻轨道擦除。