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公开(公告)号：US11355141B2
公开(公告)日：2022-06-07
申请号：US17115065
申请日：2020-12-08
发明人： Yuhui Tang , Ying Liu
IPC分类号： G11B5/31 , G11B5/127 , G11B5/02 , G11B5/23 , G11B5/48 , G11B5/105 , G11B5/265 , G11B5/00 , G11B5/11
摘要： A PMR (perpendicular magnetic recording) write head configured for microwave assisted magnetic recording (MAMR) in the form of spin assisted writing (SAW) or spin torque oscillation (STO) includes a spin-torque oscillator (STO) or SAW device and trailing shield formed of high moment magnetic material (HMTS). By patterning the STO or SAW and the HMTS in a simultaneous process the HMTS and the STO or SAW layers 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 or SAW width.
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公开(公告)号：US10714132B1
公开(公告)日：2020-07-14
申请号：US16451137
申请日：2019-06-25
发明人： Wenyu Chen , Ying Liu , Yan Wu , Yuhui Tang
摘要： 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, a second FG device in each side gap and adjoining a MP side, and third FG device in the leading gap and adjoining the MP leading side. At least one of a first and second non-magnetic conductive layer (NMC1 and NMC2) contacts the third FG device and second FG devices, respectively, instead of a conventional leading shield and side shield. Each FG device has a flux guiding layer (FGL) with a magnetization that flips to oppose a gap flux field when a current is applied across the respective gap thereby enhancing the MP write field. NMC1 and NMC2 allow better wear and corrosion resistance in addition to improved return field and down-track field gradient, and acceptable side shield stray field.
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公开(公告)号：US20200176021A1
公开(公告)日：2020-06-04
申请号：US16209136
申请日：2018-12-04
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.
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4.发明申请公开(公告)号：US20190304490A1
公开(公告)日：2019-10-03
申请号：US15942640
申请日：2018-04-02
发明人： Kowang Liu , Yuhui Tang , Moris Dovek
摘要： 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：US10279451B1
公开(公告)日：2019-05-07
申请号：US15942756
申请日：2018-04-02
发明人： Yue Liu , Yuhui Tang , Moris M. Dovek , Kowang Liu
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.
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公开(公告)号：US10229703B2
公开(公告)日：2019-03-12
申请号：US15595357
申请日：2017-05-15
发明人： Ying Liu , Yuhui Tang , Jiun-Ting Lee , Yue Liu
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.
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公开(公告)号：US20180277147A1
公开(公告)日：2018-09-27
申请号：US15990092
申请日：2018-05-25
发明人： Yue Liu , Ying Liu , Yuhui Tang , Jiun-Ting Lee , Moris Dovek , Yiming Wang
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.
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公开(公告)号：US09754612B2
公开(公告)日：2017-09-05
申请号：US14947577
申请日：2015-11-20
发明人： Yaguang Wei , Yuhui Tang , Moris Dovek , Yue Liu
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.
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公开(公告)号：US09626990B2
公开(公告)日：2017-04-18
申请号：US15361726
申请日：2016-11-28
发明人： Yuhui Tang , Yaguang Wei , Jiun-Ting Lee
CPC分类号： G11B5/112 , G11B5/127 , G11B5/1278 , G11B5/187 , G11B5/235 , G11B5/3116 , G11B5/313 , G11B5/3143 , G11B5/3146 , G11B5/315 , G11B5/3163 , G11B5/3169
摘要： 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 comprises a magnetic hot seed layer made of a >19 kG to 24 kG material that 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 a >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.
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公开(公告)号：US20230083836A1
公开(公告)日：2023-03-16
申请号：US17472304
申请日：2021-09-10
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.
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