公开(公告)号：US20140177105A1

公开(公告)日：2014-06-26

申请号：US13725593

申请日：2012-12-21

Applicant: HGST NETHERLANDS B.V.

Inventor： Masato Shiimoto ,  Ikuya Tagawa ,  Yasutaka Nishida ,  Hiroyuki Katada

IPC: G11B5/105

CPC classification number: G11B5/105 ,  G11B5/4886 ,  G11B2005/0024

Abstract: A magnetic disk drive system configured for shingled magnetic data recording wherein data tracks are recorded in an overlapping fashion on a magnetic media. The disk drive system includes magnetic write heads that are asymmetric so as to have increased writing at one side of the write head. The magnetic disk drive system includes magnetic write heads that are mirror images of one another so that write heads located at opposite surfaces of the magnetic media (e.g. one head facing up and one facing down) end up having preferential writing in the location relative to inner and outer diameters of the magnetic media.

Abstract translation: 一种磁盘驱动器系统，其配置用于带状磁数据记录，其中数据轨道以重叠的方式记录在磁性介质上。 磁盘驱动器系统包括不对称的磁性写入头，以便在写入头的一侧具有增加的写入。 磁盘驱动系统包括作为彼此的镜像的磁性写入头，使得位于磁性介质的相对表面上的写入头（例如，一个头部朝上且面向下的一个）最终在相对于内部的位置具有优先写入 和磁性介质的外径。

公开(公告)号：US09406322B2

公开(公告)日：2016-08-02

申请号：US14850984

申请日：2015-09-11

Applicant: HGST Netherlands B.V.

Inventor： Jun Aoyama ,  Masahiko Hatatani ,  Hiroyuki Katada ,  Masato Shiimoto

IPC: G11B5/39 ,  G11B5/11

CPC classification number: G11B5/3912 ,  G11B5/11 ,  G11B5/398

Abstract: Embodiments of the present invention generally include magnetoresistive heads, such as read heads, having a sensor structure and side shields disposed adjacent to the sensor structure. The distance between the side shields and the sensor structure increase in a direction from an ABS in the off-track direction. The magnetoresistive heads may include tapered surfaces on the side shields or sensor structure, or may include stepped surfaces on the side shields or sensor structure.

Abstract translation: 本发明的实施例通常包括诸如读取头的磁阻头，具有传感器结构和邻近传感器结构设置的侧面屏蔽。 侧挡板和传感器结构之间的距离在离开轨道方向的ABS方向上增加。 磁阻头可以包括在侧屏蔽或传感器结构上的锥形表面，或者可以包括侧屏蔽或传感器结构上的台阶表面。

公开(公告)号：US09099102B2

公开(公告)日：2015-08-04

申请号：US14604649

申请日：2015-01-23

Applicant: HGST Netherlands B.V.

Inventor： Hiroyuki Katada ,  Masato Shiimoto ,  Maki Maeda

IPC: G11B5/11 ,  G11B5/35 ,  G11B5/00

CPC classification number: G11B5/11 ,  G11B5/3116 ,  G11B5/314 ,  G11B5/35 ,  G11B5/56 ,  G11B2005/0024

Abstract: Approaches to improving the signal-to-noise ratio in a microwave-assisted magnetic recording hard disk drive over the entire region from the inner diameter to the outer diameter of the disk, especially in the context of shingled magnetic recording, include a narrower side gap on the side opposing a spin torque oscillator offset direction than the side gap in the offset direction, thereby increasing the gradient of the recording magnetic field in the cross-track direction and reducing the track edge noise of the recording pattern. Embodiments include use of a side shield on the side opposing the offset direction that has a higher saturation magnetization than the side shield on the side in the offset direction, thereby further increasing the gradient of the recording magnetic field in the cross-track direction.

Abstract translation: 提高微波辅助磁记录硬盘驱动器在盘的内径到外径的整个区域的信噪比的方法，特别是在带状磁记录的情况下，包括较窄的侧隙 在与偏移方向上的侧面间隔相反的旋转扭矩振荡器偏移方向上，从而增加了记录磁场在横越轨道方向上的梯度并减小了记录图案的轨迹边缘噪声。 实施例包括在偏移方向上相对于偏移方向上的侧屏蔽具有较高饱和磁化强度的一侧使用侧屏蔽，从而进一步增加记录磁场在横向方向上的梯度。

公开(公告)号：US08964332B1

公开(公告)日：2015-02-24

申请号：US14042459

申请日：2013-09-30

Applicant: HGST Netherlands B.V.

Inventor： Hiroyuki Katada ,  Masato Shiimoto ,  Maki Maeda

IPC: G11B5/187 ,  G11B5/56 ,  G11B5/10 ,  G11B5/60 ,  G11B5/00 ,  G11B20/10

CPC classification number: G11B5/11 ,  G11B5/3116 ,  G11B5/314 ,  G11B5/35 ,  G11B5/56 ,  G11B2005/0024

Abstract: Approaches to improving the signal-to-noise ratio in a microwave-assisted magnetic recording hard disk drive over the entire region from the inner diameter to the outer diameter of the disk, especially in the context of shingled magnetic recording, include a narrower side gap on the side opposing a spin torque oscillator offset direction than the side gap in the offset direction, thereby increasing the gradient of the recording magnetic field in the cross-track direction and reducing the track edge noise of the recording pattern. Embodiments include use of a side shield on the side opposing the offset direction that has a higher saturation magnetization than the side shield on the side in the offset direction, thereby further increasing the gradient of the recording magnetic field in the cross-track direction.

Abstract translation: 提高微波辅助磁记录硬盘驱动器在盘的内径到外径的整个区域的信噪比的方法，特别是在带状磁记录的情况下，包括较窄的侧隙 在与偏移方向上的侧面间隔相反的旋转扭矩振荡器偏移方向上，从而增加了记录磁场在横越轨道方向上的梯度并减小了记录图案的轨迹边缘噪声。 实施例包括在偏移方向上相对于偏移方向上的侧屏蔽具有较高饱和磁化强度的一侧使用侧屏蔽，从而进一步增加记录磁场在横向方向上的梯度。

公开(公告)号：US20170148477A1

公开(公告)日：2017-05-25

申请号：US14946648

申请日：2015-11-19

Applicant: HGST Netherlands B.V.

Inventor： Shun Tonooka ,  Masayoshi Shimizu ,  Miki Nishida ,  Hiroyuki Katada

IPC: G11B5/66 ,  G11B5/65 ,  G11B5/73

CPC classification number: G11B5/66 ,  G11B5/656

Abstract: A magnetic media having a lateral exchange control layer formed on a magnetic oxide layer of a magnetic recording layer. A cap layer is formed over the lateral exchange control layer. The lateral exchange control layer can be an alloy comprising Co and one or more of W, Ru, Hf, Ta, Nb and Fe. The lateral exchange control layer has the highest magnetic saturation moment among all the recording layers, and increases spacing between magnetic grains (e.g. increased non-magnetic boundary width), thereby reducing lateral exchange sigma. The presence of lateral exchange control increases signal to noise ratio and reduces bit error rate and increases areal density.

公开(公告)号：US09047888B2

公开(公告)日：2015-06-02

申请号：US13723070

申请日：2012-12-20

Applicant: HGST Netherlands B.V.

Inventor： Hiroyuki Katada ,  Masato Shiimoto

IPC: G11B5/127 ,  G11B5/31 ,  G11B5/00

CPC classification number: G11B5/314 ,  G11B2005/0024

Abstract: A microwave-assisted magnetic recording (MAMR) head according to one embodiment includes a main magnetic pole adapted to generate a writing magnetic field when current is applied to a write coil; a trailing shield positioned, at an air bearing surface (ABS), in a trailing direction from the main magnetic pole; and a field generation layer (FGL) positioned, at the ABS, between the main magnetic pole and the trailing shield, wherein either a portion of the main magnetic pole closer to the FGL or a portion of the trailing shield closer to the FGL is adapted to act as a spin polarization layer.

Abstract translation: 根据一个实施例的微波辅助磁记录（MAMR）头包括适于当电流施加到写入线圈时产生写入磁场的主磁极; 后挡板，位于空气轴承表面（ABS）处，沿着主磁极的拖尾方向; 以及位于主磁极和后屏蔽之间的ABS处的场产生层（FGL），其中主磁极的靠近FGL的一部分或靠近FGL的后屏蔽的一部分被适配 作为自旋极化层。

公开(公告)号：US08848317B2

公开(公告)日：2014-09-30

申请号：US13725593

申请日：2012-12-21

Applicant: HGST Netherlands B.V.

Inventor： Masato Shiimoto ,  Ikuya Tagawa ,  Yasutaka Nishida ,  Hiroyuki Katada

IPC: G11B5/187 ,  G11B5/105 ,  G11B5/23

CPC classification number: G11B5/105 ,  G11B5/4886 ,  G11B2005/0024

Abstract: A magnetic disk drive system configured for shingled magnetic data recording wherein data tracks are recorded in an overlapping fashion on a magnetic media. The disk drive system includes magnetic write heads that are asymmetric so as to have increased writing at one side of the write head. The magnetic disk drive system includes magnetic write heads that are mirror images of one another so that write heads located at opposite surfaces of the magnetic media (e.g. one head facing up and one facing down) end up having preferential writing in the location relative to inner and outer diameters of the magnetic media.

Abstract translation: 一种磁盘驱动器系统，其配置用于带状磁数据记录，其中数据轨道以重叠的方式记录在磁性介质上。 磁盘驱动器系统包括不对称的磁性写入头，以便在写入头的一侧具有增加的写入。 磁盘驱动系统包括作为彼此的镜像的磁性写入头，使得位于磁性介质的相对表面上的写入头（例如，一个头部朝上且面向下的一个）最终在相对于内部的位置具有优先写入 和磁性介质的外径。

公开(公告)号：US08705206B1

公开(公告)日：2014-04-22

申请号：US13725354

申请日：2012-12-21

Applicant: HGST Netherlands B.V.

Inventor： Maki Maeda ,  Masato Shiimoto ,  Hiroyuki Katada

IPC: G11B5/187 ,  G11B5/23

CPC classification number: G11B5/23 ,  G11B5/3116 ,  G11B5/3146 ,  G11B5/3163 ,  G11B2005/0024

Abstract: A magnetic data storage system according to one embodiment includes a magnetic head adapted to record data according to a shingled magnetic recording (SMR) process. The magnetic head includes a main pole adapted to produce a writing magnetic field, a trailing shield positioned above a trailing side of the main pole, wherein a trailing gap is defined between the trailing shield and the main pole, and a spin torque oscillator (STO) positioned above a first trailing corner of the main pole at an STO-side of the main pole, wherein the trailing gap has a greater length in a film thickness direction near the STO-side of the main pole and a lesser length in the film thickness direction near a second trailing corner of the main pole opposite the first trailing corner in a track width direction of the main pole.

Abstract translation: 根据一个实施例的磁数据存储系统包括适于根据带状磁记录（SMR）处理记录数据的磁头。 磁头包括适于产生写入磁场的主极，位于主极的后侧上方的后屏蔽，其中在后屏蔽和主极之间限定后跟间隙，以及自旋扭矩振荡器（STO ），其位于主极的STO侧的主极的第一后角上方，其中后缘在主极的STO侧附近的膜厚方向上具有较大的长度，并且膜的较小长度 在主极的轨道宽度方向上与第一后角相对的主极的第二后角附近的厚度方向。

公开(公告)号：US09672856B1

公开(公告)日：2017-06-06

申请号：US14946648

申请日：2015-11-19

Applicant: HGST Netherlands B.V.

Inventor： Shun Tonooka ,  Masayoshi Shimizu ,  Miki Nishida ,  Hiroyuki Katada

IPC: G11B5/66 ,  G11B5/73 ,  G11B5/65

CPC classification number: G11B5/66 ,  G11B5/656

Abstract: A magnetic media having a lateral exchange control layer formed on a magnetic oxide layer of a magnetic recording layer. A cap layer is formed over the lateral exchange control layer. The lateral exchange control layer can be an alloy comprising Co and one or more of W, Ru, Hf, Ta, Nb and Fe. The lateral exchange control layer has the highest magnetic saturation moment among all the recording layers, and increases spacing between magnetic grains (e.g. increased non-magnetic boundary width), thereby reducing lateral exchange sigma. The presence of lateral exchange control increases signal to noise ratio and reduces bit error rate and increases areal density.

公开(公告)号：US09396744B1

公开(公告)日：2016-07-19

申请号：US14822853

申请日：2015-08-10

Applicant: HGST Netherlands B.V.

Inventor： Masato Yamashita ,  Hiroyuki Katada ,  Jun Aoyama ,  Masato Shiimoto

IPC: G11B5/39

CPC classification number: G11B5/3912 ,  G11B5/115 ,  G11B5/3958 ,  G11B5/3977 ,  G11B5/4886

Abstract: A magnetic read head configured for two dimensional magnetic recording and having asymmetrical secondary read elements. The magnetic read head includes a primary read element configured to read a data track (i.e. n data track) and first and second secondary read elements located over adjacent data tracks (i.e. n+1, n−1 data track) at either side of the data track to be read. The secondary read element have asymmetrical off track amplitude profiles, preferably such that they each have a steep amplitude profile at the outer side and a broader cross-track amplitude profile at their inner sides. This allows the secondary read elements to detect signals of the adjacent data track (so that those signals can be subtracted out of the signal from the primary reader) without the secondary read elements also picking up further adjacent data tracks (i.e. n+2, n−2).

Abstract translation: 一种用于二维磁记录并具有不对称二次读取元件的磁读头。 磁读头包括被配置为读取数据轨道（即，n个数据轨道）的主要读取元件以及位于该数据轨道的任一侧上的相邻数据轨道（即，n + 1，n-1个数据轨道）上的第一和第二辅助读取元件 数据轨道要读取。 次级读取元件具有非对称偏离轨迹幅度分布，优选地使得它们在外侧具有陡峭的幅度分布，并且在其内侧具有更宽的交叉轨迹幅度分布。 这允许次级读取元件检测相邻数据轨道的信号（使得可以从主读取器的信号中减去这些信号），而辅助读取元件也可以拾取更远的相邻数据轨道（即n + 2，n -2）。