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11. 发明授权

US09082433B1 PMR writer with patterned shields for adjacent track erasure improvement 有权
标题翻译：具有图案化屏蔽的PMR写入器用于相邻轨道擦除改进
公开(公告)号：US09082433B1
公开(公告)日：2015-07-14
申请号：US14297839
申请日：2014-06-06
申请人： Headway Technologies, Inc.
发明人： Yuhui Tang , Suping Song , Lijie Guan , Moris Dovek , Yaguang Wei , Yue Liu
IPC分类号： G11B5/127 , G11B5/31
CPC分类号： G11B5/315 , G11B5/11 , G11B5/1278 , G11B5/3146
摘要： A PMR writer is disclosed wherein one or more of the leading shield, side shields, and trailing shield are comprised of first portion that is elongated in a cross-track direction at the ABS, and a second portion consisting of a plurality of pads each having a side adjoining the first portion along a side opposite the ABS. Pads may have a polygonal shape or a shape with curvature and are separated by portions of a dielectric layer. When a length of the pads in a down-track direction is substantially greater than a width in a cross-track direction and height in a vertical direction, then shape anisotropy in the shield is biased in a down-track direction and is perpendicular to the driving flux direction from the main pole tip thereby minimizing 180 degree rotations in magnetization and associated adjacent track erasure.
摘要翻译：公开了一种PMR写入器，其中前屏蔽，侧屏蔽和后屏蔽中的一个或多个由在ABS处的交叉轨道方向上细长的第一部分和由多个焊盘组成的第二部分组成，每个焊盘具有沿着与ABS相对的一侧邻接第一部分的一侧。垫片可以具有多边形形状或具有曲率的形状并且被介电层的一部分分隔开。当沿着轨道方向的焊盘的长度大大地大于横向方向上的宽度和垂直方向的高度时，屏蔽件中的形状各向异性在下行方向被偏置并且垂直于从主极端子驱动磁通方向，从而使磁化和相关的相邻轨道擦除中的180度旋转最小化。

12. 发明申请

US20200176021A1 Perpendicular Magnetic Recording (PMR) Writer with Recessed Leading Shield 审中-公开
公开(公告)号：US20200176021A1
公开(公告)日：2020-06-04
申请号：US16209136
申请日：2018-12-04
申请人： Headway Technologies, Inc.
发明人： Ying Liu , Yuhui Tang , Yue Liu , Kei Hirata
IPC分类号： G11B5/11
摘要： A PMR (perpendicular magnetic recording) write head includes a main write pole (MP) that is surrounded by magnetic shields, including laterally disposed side shields (SS), a trailing shield (TS) and a leading shield (LS). The leading shield includes a leading-edge taper (LET) that conformally abuts a tapered side of the write pole. The leading-edge shield and the leading-edge taper can be independently recessed in a proximal direction away from an air bearing surface (ABS) plane so that one or the other of them is recessed and the other remains coplanar with the ABS, or both are recessed by independent amounts. In another configuration the LS is not planar but has a recessed portion in a center track region and two surrounding regions that are coplanar with the ABS plane.

13. 发明申请

US20190279664A1 Dual Perpendicular Magnetic Recording (PMR) Writer Base Structures and Mirror Imaged Asymmetrical Magnetic Core Shapes for Reduced Writer-Writer Spacing (WWS) 审中-公开
公开(公告)号：US20190279664A1
公开(公告)日：2019-09-12
申请号：US15913167
申请日：2018-03-06
申请人： Headway Technologies, Inc.
发明人： Yue Liu
IPC分类号： G11B5/31 , G11B5/127 , G11B5/147
摘要： A dual PMR writer is disclosed wherein a first main pole (MP1) in writer 1 is a mirror image of a second main pole (MP2) in writer 2 with respect to a center plane aligned orthogonal to the air bearing surface (ABS). MP1 and MP2 may have an asymmetrical top-down shape to reduce writer-writer spacing (WWS) and read write offset (RWO) when a single or double reader is positioned down-track at the center plane. Accordingly, there is less track misregistration and better area density capability. Each of MP1 and MP2 as well as a top yoke (TY), and a tapered bottom yoke (tBY) have a rectangular back portion of width “w” from 4 to 10 microns. Spacing between MP1 and MP2 back portions may be ≥4 microns to prevent cross-talk. RWO is reduced from ≥4 microns for symmetrical TY/MP/tBY shapes to 3 microns or less for asymmetrical shapes.

14. 发明授权

US10279451B1 Dual perpendicular magnetic recording (PMR) writer application with special up and down head assignment for best areal density in hard disk drive (HDD) 有权
公开(公告)号：US10279451B1
公开(公告)日：2019-05-07
申请号：US15942756
申请日：2018-04-02
申请人： Headway Technologies, Inc.
发明人： Yue Liu , Yuhui Tang , Moris M. Dovek , Kowang Liu
IPC分类号： G11B5/00 , B24B37/04 , G11B5/596 , B24B37/013 , G11B5/012 , G11B5/31 , G11B5/09
摘要： A dual PMR writer is disclosed wherein the better writer at outer diameter (OD) skew is paired with a suspension after dynamic performance (DP) spin stand testing so that the better writer is the inner writer formed closer to a recording disk center than the other writer. Accordingly, lower read write offset is achieved at OD skew and better area density capability is realized. Preferably, there is a symmetrical or substantially symmetrical air bearing surface design after lapping and spin stand testing to afford flexibility in pairing an up facing (UP) head configuration with an UP suspension, or a down facing (DN) head configuration with a DN suspension to enable the better writer to be the inner writer. The dual PMR writer may have a dual dynamic fly height heater on each side of a center plane separating the two writers to improve write gap protrusion in the better writer.

15. 发明授权

US10229703B2 PMR write head with patterned leading edge taper 有权
公开(公告)号：US10229703B2
公开(公告)日：2019-03-12
申请号：US15595357
申请日：2017-05-15
申请人： Headway Technologies, Inc.
发明人： Ying Liu , Yuhui Tang , Jiun-Ting Lee , Yue Liu
IPC分类号： G11B5/31 , G11B5/11 , G11B5/127 , G11B5/187 , G11B5/235
摘要： A perpendicular magnetic recording writer is disclosed with an all wrap around (AWA) shield design in which a surface of the leading shield that contacts the lead gap is comprised of a notch that is recessed 20 to 120 nm from the air bearing surface (ABS) and has a first side with a down-track dimension of 20-200 nm that is aligned parallel to the ABS. In one embodiment, the notch is aligned below the main pole leading side and has a cross-track width substantially the same as the track width of the main pole trailing side. The notch has two sidewalls formed equidistant from a center plane that bisects the leading shield wherein each sidewall intersects the first side at an angle of 90 to 170 degrees. Accordingly, overwrite and bit error rate are improved while adjacent track interference and tracks per square inch capability are substantially maintained.

16. 发明申请

US20180277147A1 Write Head Designs with Sandwich Trailing Shield (STS) and Funnel Trailing Shield (FTS) for High Data Rate Perpendicular Recording 审中-公开
公开(公告)号：US20180277147A1
公开(公告)日：2018-09-27
申请号：US15990092
申请日：2018-05-25
申请人： Headway Technologies, Inc.
发明人： Yue Liu , Ying Liu , Yuhui Tang , Jiun-Ting Lee , Moris Dovek , Yiming Wang
IPC分类号： G11B5/31 , G11B5/187 , G11B5/127 , G11B5/008 , G11B5/39
CPC分类号： G11B5/3116 , G11B5/00826 , G11B5/1278 , G11B5/187 , G11B5/1871 , G11B5/315 , G11B5/3163 , G11B5/3912
摘要： A PMR writer is disclosed with an all wrap around (AWA) shield design in which one or more of the leading shield, side shields, and trailing shield (TS) structure (except the hot seed layer) at the air bearing surface (ABS) are comprised of an alloy having a damping parameter α of ≥0.04 to minimize wide area track erasure (WATE). The TS structure comprises two outer magnetic layers with an 8-16 kiloGauss (kG) saturation magnetic moment (Ms) on each side of a center stack with a lower write gap, a middle hot seed layer (Ms of 19-24 kG), and an upper magnetic layer (Ms of 16-24 kG). The hot seed layer, upper TS magnetic layer and overlying PP3 TS promote improved area density capability (ADC). A second TS layer with Ms of 16-24 kG and a full width at the ABS may be formed on the upper magnetic layer.

17. 发明授权

US09754612B2 Areal density improvement of perpendicular magnetic recording (PMR) write head by tuning magnetic flux loops 有权
公开(公告)号：US09754612B2
公开(公告)日：2017-09-05
申请号：US14947577
申请日：2015-11-20
申请人： Headway Technologies, Inc.
发明人： Yaguang Wei , Yuhui Tang , Moris Dovek , Yue Liu
IPC分类号： G11B5/127 , G11B5/31 , G11B5/147
CPC分类号： G11B5/315 , G11B5/1278 , G11B5/3116 , G11B5/3123
摘要： A PMR writer is disclosed wherein magnetic flux return from a magnetic medium to a main pole is substantially greater through a trailing shield structure than through a leading shield and return path layer (RTP). Magnetic impedance is increased between the RTP and main pole in the leading return loop by modifying the size and shape of the back gap connection (BGC), by decreasing Bs in the RTP or reducing its thickness, or by removing one or more layers in the BGC and replacing with dielectric material or non-magnetic metal to form a dielectric gap between the RTP and main pole. As a result, area density control and bit error rate are improved over a conventional dual write shield (DWS) structure comprising two flux return pathways. Moreover, adjacent track erasure is maintained at a level similar to a DWS design.

18. 发明申请

US20230083836A1 Magnetic Recording Writer With Improved Main Pole Shape 有权
公开(公告)号：US20230083836A1
公开(公告)日：2023-03-16
申请号：US17472304
申请日：2021-09-10
申请人： Headway Technologies, Inc.
发明人： Ying Liu , Yuhui Tang , Jiun-Ting Lee , Yue Liu
IPC分类号： G11B5/31
摘要： A magnetic recording writer is disclosed. In some embodiments, the writer includes a main pole having a front portion and a back portion, a gap layer surround the main pole at the ABS, and a shield structure. The front portion includes a pole tip at an ABS plane, a pole tip thickness in a down-track direction, and curved sidewalls on each side of a center plane that is orthogonal to the ABS and bisects the main pole. The back portion includes first flared sidewalls extending from the curved sidewalls at an angle between 0 and 25 degrees relative to planes parallel to the center plane. The shield structure includes sidewalls having a sidewall portion facing the main pole and formed substantially conformal to the curved sidewalls up to a height of about 30-200 nm where the sidewall portions no longer follow the shape of the main pole.

19. 发明申请

US20220165300A1 WRITER WITH ADAPTIVE SIDE GAP 有权
公开(公告)号：US20220165300A1
公开(公告)日：2022-05-26
申请号：US16953925
申请日：2020-11-20
申请人： Headway Technologies, Inc.
发明人： Ying Liu , Yuhui Tang , Yue Liu , Jiun-Ting Lee , Shengyuan Wang , Xiaomin Liu
IPC分类号： G11B5/31 , G11B5/23 , G11B5/48
摘要： A PMR (perpendicular magnetic recording) write head configured for thermally assisted magnetic recording (TAMR) and microwave assisted magnetic recording (MAMR) is made adaptive to writing at different frequencies by inserting thin layers of magnetic material into the material filling the side gaps (SG) between the magnetic pole (MP) and the side shields (SS). At high frequencies, the thin magnetic layers saturate and lower the magnetic potential of the bulky side shields

20. 发明授权

US11152021B1 Perpendicular magnetic recording (PMR) writer with tunable pole protrusion (TPP) designs for 2 terabytes/platter (TB/P) and beyond 有权
公开(公告)号：US11152021B1
公开(公告)日：2021-10-19
申请号：US17095861
申请日：2020-11-12
申请人： Headway Technologies, Inc.
发明人： Yue Liu , Yan Wu
IPC分类号： G11B5/187 , G11B5/39 , G11B5/60 , G11B5/48 , G11B5/245 , G11B5/00 , G11B5/127
摘要： A perpendicular magnetic recording (PMR) writer is disclosed wherein an insulation layer is formed between a top yoke (TY) and an uppermost (PP3) trailing shield to electrically isolate the main pole (MP) from a trailing loop for magnetic flux return. One or both of a first non-magnetic (NM) metal layer and a second NM metal layer are formed between the MP tip and a hot seed layer and side shields, respectively, to form an electrical path that is in parallel to that of a dynamic fly height (DFH) heater circuit. MP tip protrusion is enhanced and writability is improved especially for track widths

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