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公开(公告)号：US10482905B2
公开(公告)日：2019-11-19
申请号：US15942640
申请日：2018-04-02
Applicant: Headway Technologies, Inc.
Inventor： Kowang Liu , Yuhui Tang , Moris Dovek
Abstract: A dual perpendicular magnetic recording writer is disclosed wherein the better of two writers on a slider is determined by performance testing, and is then integrated into a head gimbal assembly. Main pole layers in the two writers are separated by a cross-track width
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公开(公告)号：US20190295571A1
公开(公告)日：2019-09-26
申请号：US16424622
申请日：2019-05-29
Applicant: Headway Technologies, Inc.
Inventor： Yue Liu , Ying Liu , Yuhui Tang , Jiun-Ting Lee , Moris Dovek , Yiming Wang
Abstract: A method of forming a PMR writer 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 and upper TS magnetic layer 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.
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公开(公告)号：US10032469B2
公开(公告)日：2018-07-24
申请号：US14933758
申请日：2015-11-05
Applicant: Headway Technologies, Inc.
Inventor： Sanghyun Lim , Yuhui Tang , Yaguang Wei , Yue Liu , Moris Dovek
Abstract: A PMR (perpendicular magnetic recording) head includes a tapered write pole that is fully surrounded by wrapped-around magnetic shields, including laterally disposed side shields, a trailing shield and a leading shield. A layer of high magnetic saturation material (high Bs) is formed on the leading edge of the trailing shield and extends rearward, away from the ABS plane to define a cross-sectional write gap shape that is not conformal with the shape of the tapered write pole. The cross-sectional shape of this shield layer enables it to absorb flux from the write pole so that the flux for writing is enhanced and concentrated at the area of the recording medium being written upon and does not extend to adjacent tracks or to downtrack positions at which such flux is not desired.
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公开(公告)号：US09934796B2
公开(公告)日：2018-04-03
申请号：US15685227
申请日：2017-08-24
Applicant: Headway Technologies, Inc.
Inventor： Yaguang Wei , Yuhui Tang , Moris Dovek , Yue Liu
CPC classification number: G11B5/315 , G11B5/1278 , G11B5/3116 , G11B5/3123
Abstract: 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 return loop comprised of a leading shield, return path layer (RTP), and back gap connection (BGC). Magnetic impedance is increased between the RTP and main pole in the leading return loop by removing one or more layers in the BGC and replacing with dielectric material and non-magnetic metal to form a dielectric gap between the RTP and main pole. The non-magnetic metal may be Cu that is electrically isolated from coils within the write head. 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.
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公开(公告)号：US09245554B2
公开(公告)日：2016-01-26
申请号：US14580344
申请日：2014-12-23
Applicant: Headway Technologies, Inc.
Inventor： Xuhui Jin , Xiaohua Lou , Joe Smyth , Moris Dovek
CPC classification number: G11B5/4866 , G11B5/127 , G11B5/314 , G11B5/6005 , G11B5/6088 , G11B13/04 , G11B2005/0021 , Y10T29/49032
Abstract: A TAMR (Thermal Assisted Magnetic Recording) write head uses the energy of optical-laser excited surface plasmons in a plasmon generator to locally heat a magnetic recording medium and reduce its coercivity and magnetic anisotropy. The optical radiation is transmitted to the plasmon generator by means of a waveguide, whose optical axis (centerline) is tilted relative to either or both the backside surface normal and ABS surface normal in order to eliminate back reflections of the optical radiation that can adversely affect the properties and performance of the laser. Variations of the disclosure include tilting the plasmon generator, the waveguide and the laser diode.
Abstract translation: TAMR（热辅助磁记录）写头使用等离子体发生器中的激光激光表面等离激元的能量来局部加热磁记录介质并降低其矫顽力和磁各向异性。 光辐射通过波导传输到等离子体发生器，该波导的光轴（中心线）相对于背面法线和ABS表面法线中的任一个或两者倾斜，以消除可能不利地影响的光辐射的反射反射 激光的性能和性能。 本公开的变型包括倾斜等离子体发生器，波导和激光二极管。
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Patent Agency Ranking
公开(公告)号：US09070383B2
公开(公告)日：2015-06-30
申请号：US14139091
申请日：2013-12-23
Applicant: Headway Technologies, Inc.
Inventor： Lijie Guan , Po-Kang Wang , Moris Dovek , Joe Smyth , Kenichi Takano , Yoshitaka Sasaki
CPC classification number: G11B5/1278 , G11B5/232 , G11B5/3116 , G11B5/3146
Abstract: A structure and a process for a perpendicular write pole that provides increased magnetic flux at the ABS is disclosed. This is accomplished by increasing the amount of write flux that originates above the write gap, without changing the pole taper at the ABS. Three embodiment of the invention are discussed.
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7.发明授权Umbrella shield writer (UmSW) design for perpendicular magnetic recording (PMR) 有权用于垂直磁记录（PMR）的伞形屏蔽刻录机（UmSW）设计公开(公告)号：US08879208B1
公开(公告)日：2014-11-04
申请号：US14093969
申请日：2013-12-02
Applicant: Headway Technologies, Inc.
Inventor： Yue Liu , Yaguang Wei , Yuhui Tang , Moris Dovek
IPC: G11B5/127
CPC classification number: G11B5/3146 , G11B5/11 , G11B5/1278 , G11B5/3116
Abstract: An umbrella shield (UmS) is included as the uppermost magnetic layer in a trailing shield design in a read/write head to reduce stray field effects, lower bit error rate, and improve protrusion profile for better touch down detection. The UmS may be exposed or recessed from an air bearing surface (ABS), and has a cross-track width, down-track thickness, and length toward a back side that is greater than the corresponding width, thickness, and length dimensions of an underlying PP3 trailing shield. UmS may substantially conform to an arched PP3 shield shape or may be a flat layer. An insulation layer with a thickness of at least 0.3 microns is formed between the UmS and PP3 trailing shield to prevent undesirable coupling. The UmS preferably has a width greater than any other shield in the read/write head.
Abstract translation: 伞形屏蔽（UmS）被包括在读/写头中的尾部屏蔽设计中的最上层的磁性层，以减少杂散场效应，降低误码率，并改善突出轮廓，以实现更好的触摸降低检测。 UmS可以从空气轴承表面（ABS）暴露或凹入，并且具有跨越轨道宽度，下轨道厚度和朝向背侧的长度，其大于相应的宽度，厚度和长度尺寸 底层PP3后盾。 UmS可以基本上符合拱形PP3屏蔽形状或者可以是平坦层。 在UmS和PP3后挡板之间形成厚度至少为0.3微米的绝缘层，以防止不期望的耦合。 UmS优选地具有大于读/写头中的任何其它屏蔽的宽度。
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公开(公告)号：US20140177103A1
公开(公告)日：2014-06-26
申请号：US14193446
申请日：2014-02-28
Applicant: Headway Technologies, Inc.
Inventor： Zhigang Bai , Kowang Liu , Yan Wu , Moris Dovek
IPC: G11B5/39
CPC classification number: G11B5/398 , G11B5/1278 , G11B5/3116 , G11B5/315 , G11B5/3163 , G11B5/3183 , G11B5/3186 , Y10T29/49032 , Y10T29/49041 , Y10T29/49044 , Y10T29/49048
Abstract: A perpendicular magnetic recording (PMR) head is fabricated with a multi-level tapered write pole. The write pole comprises a main pole with a tapered tip on a leading edge or a trailing edge, on which is formed at least one yoke that has a tapered edge. The edge of the yoke is recessed from the ABS of the main pole, giving the head a stepped profile. The yoke can be a single yoke formed on one side of the main pole or it can be two yokes formed on both the leading and trailing sides of the main pole. The write pole structure creates an efficient channeling of magnetic flux to the ABS surface of the pole tip which produces magnetic recording field at high area densities.
Abstract translation: 垂直磁记录（PMR）头用多级锥形写柱制造。 写极包括在前缘或后缘具有锥形尖端的主极，在其上形成有至少一个具有锥形边缘的轭。 轭的边缘从主极的ABS凹入，使头部呈阶梯状。 轭可以是形成在主极的一侧上的单个磁轭，或者它可以是形成在主极的前侧和后侧的两个轭。 写磁极结构产生磁通量到磁极尖端的ABS表面的有效的通道，其产生高区域密度的磁记录场。
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公开(公告)号：US08755256B2
公开(公告)日：2014-06-17
申请号：US13676490
申请日：2012-11-14
Applicant: Headway Technologies, Inc.
Inventor： Tobias Maletzky , Xuhui Jin , Yiming Wang , Dayu Zhou , Joe Smyth , Moris Dovek
IPC: G11B11/00
CPC classification number: G11B13/04 , G02B6/1226 , G11B5/314 , G11B5/6088 , G11B2005/0021
Abstract: A TAMR (Thermal Assisted Magnetic Recording) write head uses the near field energy of optical-laser excited plasmon eigenmodes in a plasmon resonator to locally heat a magnetic recording medium and reduce its coercivity and magnetic anisotropy. The plasmon resonator is formed as a conducting disk-shaped structure with an extending peg that serves to further confine the near fields within a small region of the recording medium. The resonator eigenmodes are excited, through direct or evanescent coupling, by an interference pattern formed by the overlap of optical waves within a dual-channel waveguide, the interference pattern being the result of the waves in one branch being phase-shifted relative to the waves in the other branch.
Abstract translation: TAMR（热辅助磁记录）写头使用等离子体激元谐振器中的激光激发等离子体激元等离子体本征模态的近场能来局部加热磁记录介质并降低其矫顽力和磁各向异性。 等离子体激元谐振器形成为具有延伸钉的导电盘形结构，其用于进一步将近场限制在记录介质的小区域内。 谐振器本征模通过直接或消逝耦合被由双通道波导内的光波重叠形成的干涉图形激发，干涉图案是一个分支中相对于波相移的结果的结果 在另一个分支。
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公开(公告)号：US20140111886A1
公开(公告)日：2014-04-24
申请号：US14139069
申请日：2013-12-23
Applicant: Headway Technologies, Inc.
Inventor： Lijie Guan , Po-Kang Wang , Moris Dovek , Joe Smyth , Kenichi Takano , Yoshitaka Sasaki
IPC: G11B5/127
CPC classification number: G11B5/1278 , G11B5/232 , G11B5/3116 , G11B5/3146
Abstract: A structure and a process for a perpendicular write pole that provides increased magnetic flux at the ABS is disclosed. This is accomplished by increasing the amount of write flux that originates above the write gap, without changing the pole taper at the ABS. Three embodiment of the invention are discussed.
Abstract translation: 公开了一种用于在ABS处提供增加的磁通量的垂直写入极的结构和工艺。 这是通过增加起始于写入间隙的写入通量的量来实现的，而不改变ABS处的极锥度。 讨论本发明的三个实施例。
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