公开(公告)号：US20150170697A1

公开(公告)日：2015-06-18

申请号：US14629781

申请日：2015-02-24

Applicant: Seagate Technology LLC

Inventor： Shaoping Li ,  Kaizhong Gao ,  Lei Wang ,  Wenzhong Zhu ,  Xiaobin Wang

IPC: G11B5/667 ,  H01F41/02 ,  G11B5/65 ,  G11B5/82 ,  G11B5/66

CPC classification number: G11B5/667 ,  B82Y10/00 ,  G11B5/64 ,  G11B5/65 ,  G11B5/656 ,  G11B5/66 ,  G11B5/743 ,  G11B5/746 ,  G11B5/82 ,  G11B2005/0029 ,  H01F41/0206 ,  Y10S428/90 ,  Y10T29/4902 ,  Y10T29/49032 ,  Y10T29/49067 ,  Y10T428/12458 ,  Y10T428/12465 ,  Y10T428/12931 ,  Y10T428/26 ,  Y10T428/265

Abstract: A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic coercivity Hk extending along its length between the first end and second ends; and (2) predetermined local exchange coupling strengths along the length.

Abstract translation: 适用于高记录密度和高数据记录速率的垂直磁记录介质包括具有至少一个具有在其上形成层叠层的表面的非磁性基板，该层堆叠包括垂直记录层，该垂直记录层包含多个柱状磁性颗粒 垂直于衬底表面延伸一段长度，第一端远离表面，靠近表面的第二端，其中每个磁性颗粒具有：（1）垂直磁矫顽力Hk沿其长度延伸的梯度 末端和末端; 和（2）沿着长度的预定局部交换耦合强度。

公开(公告)号：US20140022837A1

公开(公告)日：2014-01-23

申请号：US13947810

申请日：2013-07-22

Applicant: Seagate Technology LLC

Inventor： Xiaobin Wang ,  Wenzhong Zhu ,  Henry Huang ,  Yiran Chen ,  Haiwen Xi

IPC: G11C11/16

CPC classification number: G11C11/1675 ,  G01R33/098 ,  G06F7/588 ,  G11C11/161 ,  G11C11/1697

Abstract: Devices and methods for generating a random number that utilizes a magnetic tunnel junction are disclosed. An AC current source can be in electrical connection to a magnetic tunnel junction to provide an AC current to the magnetic tunnel junction. A read circuit can be used to determine a bit based on a state of the magnetic tunnel junction. A rate of production of the bits can be adjusted, such as by adjusting a frequency or amplitude of the AC current. A probability of obtaining a “0” or “1” bit can be managed, such as by an addition of DC biasing to the AC current.

Abstract translation: 公开了用于产生利用磁性隧道结的随机数的装置和方法。 AC电流源可以与磁性隧道结电连接，以向磁性隧道结提供AC电流。 读取电路可以用于基于磁性隧道结的状态来确定位。 可以通过调整AC电流的频率或振幅来调整位的产生速率。 可以例如通过向AC电流添加DC偏置来管理获得“0”或“1”位的概率。

公开(公告)号：US20140011053A1

公开(公告)日：2014-01-09

申请号：US13960609

申请日：2013-08-06

Applicant: Seagate Technology LLC

Inventor： Shaoping Li ,  Kaizhong Gao ,  Lei Wang ,  Wenzhong Zhu ,  Xiaobin Wang

IPC: G11B5/66

CPC classification number: G11B5/667 ,  B82Y10/00 ,  G11B5/64 ,  G11B5/65 ,  G11B5/656 ,  G11B5/66 ,  G11B5/743 ,  G11B5/746 ,  G11B5/82 ,  G11B2005/0029 ,  H01F41/0206 ,  Y10S428/90 ,  Y10T29/4902 ,  Y10T29/49032 ,  Y10T29/49067 ,  Y10T428/12458 ,  Y10T428/12465 ,  Y10T428/12931 ,  Y10T428/26 ,  Y10T428/265

Abstract: A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic anisotropy field Hk extending along its length between the first end and second ends; and (2) predetermined local exchange coupling strengths along the length.

Abstract translation: 适用于高记录密度和高数据记录速率的垂直磁记录介质包括具有至少一个具有在其上形成层叠层的表面的非磁性基板，该层堆叠包括垂直记录层，该垂直记录层包含多个柱状磁性颗粒 垂直于衬底表面延伸一段长度，第一端远离表面，接近表面的第二端，其中每个磁性颗粒具有：（1）垂直磁各向异性场Hk沿其长度延伸的梯度 第一端和第二端; 和（2）沿着长度的预定局部交换耦合强度。