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公开(公告)号：US11289116B1
公开(公告)日：2022-03-29
申请号：US16953903
申请日：2020-11-20
Applicant: Headway Technologies, Inc.
Inventor： Kowang Liu , Yuhui Tang , Siu Yin Ngan , Qinghua Zeng , Ellis Cha
Abstract: A PMR, TAMR or MAMR (Perpendicular Magnetic Recording, Thermally Assisted Magnetic Recording or Microwave Assisted Magnetic Recording) slider-mounted read/write head produces less heat during operation by using magnetic read shields in which are embedded a patterned layer of thermally absorbing material. At least one shield includes a heating coil which is used to adjust the fly-height of the slider by creating a thermal protrusion at the slider ABS. When additional sources of energy, such as laser heating, microwave heating or the write coil itself, are applied to the recording medium, the shields can overheat, adversely affecting their performance. The patterned layer of heat absorbing material reduces the flow of heat from the thermal heating coil to the air bearing surface (ABS) thus cooling the region around the write head while not adversely affecting the shape of the thermal protrusion.
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公开(公告)号：US20210012793A1
公开(公告)日：2021-01-14
申请号：US16507177
申请日：2019-07-10
Applicant: Headway Technologies, Inc.
Inventor： Yuhui Tang , Ying Liu
Abstract: A PMR (perpendicular magnetic recording) write head configured for microwave assisted magnetic recording (MAMR) includes a spin-torque oscillator (STO) and trailing shield formed of high moment magnetic material (HMTS). By patterning the STO and the HMTS in a simultaneous process the HMTS and the STO layer are precisely aligned and have very similar cross-track widths. In addition, the write gap at an off-center location has a thickness that is independent from its center-track thickness and the write gap total width can have a flexible range whose minimum value is the same width as the STO width.
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33.发明授权公开(公告)号：US10714127B1
公开(公告)日：2020-07-14
申请号：US16451146
申请日：2019-06-25
Applicant: Headway Technologies, Inc.
Inventor： Wenyu Chen , Ying Liu , Yan Wu , Yuhui Tang
Abstract: A perpendicular magnetic recording writer has a main pole (MP) with a first flux guiding (FG) device in a write gap between the MP trailing side and a trailing shield, and a second FG device in the leading gap (LG) and each side gap (SG). The SG angle is reduced to 15° to 45° to enable conformal and more uniform FG device layers to be formed in the SG and LG. As a result, the MP shape and write field are more reproducible. To compensate for a thinner MP thickness at the air bearing surface that results from maintaining the track width at a shallower SG angle, an upper MP tip may be formed on the lower MP tip thereby generating a hexagonal shape for the combined MP tip. In this case, the second FG device conforms to the shape of the two upper MP tip sides and trailing side.
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34.发明授权公开(公告)号：US10657988B2
公开(公告)日：2020-05-19
申请号：US16296349
申请日：2019-03-08
Applicant: Headway Technologies, Inc.
Inventor： Ying Liu , Yuhui Tang , Jiun-Ting Lee , Yue Liu
Abstract: A method is disclosed for forming a perpendicular magnetic recording writer with an all wrap around (AWA) shield design wherein a surface of the leading shield that contacts the lead gap has 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.
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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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Patent Agency Ranking
36.发明申请公开(公告)号：US20190333531A1
公开(公告)日：2019-10-31
申请号：US15966192
申请日：2018-04-30
Applicant: Headway Technologies, Inc.
Inventor： Yue Liu , Ying Liu , Yuhui Tang
Abstract: Dual and triple PMR writers are disclosed wherein the number of writer pads required to energize the selected PMR writer is minimized to three or four, respectively, with a coil configuration wherein separate top coils are connected by separate interconnects or side taps to separate bottom coils. Either top coils or bottom coils may be linked to a common W− pad. Alternatively, there may be one bottom coil that allows all output current to flow to a common W− pad. Coils may have a pancake or helical shape. In dual PMR writer embodiments, there may be one or two dynamic fly height heater coils. Magnetic performance in the selected writer of a dual PMR writer is similar to that of a single PMR writer with regard to erase width in AC mode (EWAC), Hy field, trailing and side shield return fields, down-track and cross-track gradient.
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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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39.发明授权公开(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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40.发明申请公开(公告)号：US20170076741A1
公开(公告)日：2017-03-16
申请号：US15361721
申请日：2016-11-28
Applicant: Headway Technologies, Inc.
Inventor： Yuhui Tang , Yaguang Wei , Jiun-Ting Lee
CPC classification number: G11B5/112 , G11B5/127 , G11B5/1278 , G11B5/187 , G11B5/235 , G11B5/3116 , G11B5/313 , G11B5/3143 , G11B5/3146 , G11B5/315 , G11B5/3163 , G11B5/3169
Abstract: A method is disclosed for forming a perpendicular magnetic recording writer with an all wrap around (AWA) shield design wherein one or more of the leading shield, trailing shield, and side shields are a composite wherein a magnetic “hot seed” layer made of a >19 kG to 24 kG material adjoins a gap layer, and a side of the hot seed layer opposite the gap layer adjoins a high damping magnetic layer made of a 10-16 kG material (or a 16-19 kG material in the trailing shield) having a Gilbert damping parameter α>0.04. In one embodiment, the high damping magnetic layer is FeNiRe with a Re content of 3 to 15 atomic %. The main pole leading and trailing sides may be tapered. Side shields may have a single taper or dual taper structure. Higher writer speed with greater areal density capability is achieved.
Abstract translation: 公开了一种用于形成具有全包裹（AWA）屏蔽设计的垂直磁记录写入器的方法，其中前屏蔽，后屏蔽和侧屏蔽中的一个或多个是复合材料，其中磁性“热晶种”层由 > 19kG至24kG材料邻接间隙层，与间隙层相对的热种子层的一侧邻接由10-16kG材料制成的高阻尼磁性层（或后盾中的16-19kG材料 ）具有吉尔伯特阻尼参数α> 0.04。 在一个实施例中，高阻尼磁性层是Re含量为3至15原子％的FeNiRe。 主杆的前端和后端可以是锥形的。 侧面屏蔽可以具有单个锥形或双锥形结构。 实现了更高的写入速度，具有更大的面密度能力。
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