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公开(公告)号：US10714129B1
公开(公告)日：2020-07-14
申请号：US16372517
申请日：2019-04-02
发明人： Yuhui Tang , Ying Liu
IPC分类号： G11B5/127 , G11B5/187 , G11B5/48 , G11B5/115 , G11B5/35 , G11B5/31 , G11B5/23 , G11B5/235 , G11B5/00
摘要： A microwave assisted magnetic recording writer has a main pole (MP) with a write gap formed between the MP trailing side and a trailing shield, a side gap between each MP side and a side shield, and a leading gap between the MP leading side and a leading shield. A spin torque oscillator (STO) is formed in at least each side gap and recessed from the air bearing surface to reduce wear. Each STO has a flux guiding layer (FGL) with a magnetization that flips to a direction substantially opposite to the gap field when a current of sufficient density is applied from the adjacent shield towards the MP thereby forcing additional flux out of the MP at the ABS to enhance writability on a magnetic recording medium. Accordingly, the gap between the recessed STO and ABS is reduced to provide enhanced area density capability without sacrificing overwrite.
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公开(公告)号：US10446178B1
公开(公告)日：2019-10-15
申请号：US16190774
申请日：2018-11-14
发明人： Yuhui Tang , Ying Liu
摘要： A microwave assisted magnetic recording (MAMR) writer has a recessed spin flipping element formed in the write gap between the MP tapered trailing side and a first trailing shield, a thickness ≤ to the write gap thickness, and a width ≤ to a maximum width of the MP tapered trailing side. The spin flipping element has a lower non-spin preserving layer, a middle flux guiding layer (FGL), and an upper spin preserving layer. The FGL has a magnetization that flips to a direction substantially anti-parallel to the write gap field when a current of sufficient magnitude is applied from the trailing shield towards the MP thereby increasing reluctance in the write gap and forcing additional flux out of the MP at the air bearing surface to enhance writability and tracks per inch capability on a recording medium while maintaining bits per inch capability compared with conventional MAMR writers.
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公开(公告)号：US10366713B1
公开(公告)日：2019-07-30
申请号：US15912821
申请日：2018-03-06
发明人： Yuhui Tang , Moris Dovek , Wenjie Chen
摘要： A pad/trace line layout for a PMR writer structure having two or more writers on a slider, and a process for selecting the best of the multiple writers is disclosed. Each writer is individually probed with a spin stand test device to generate performance results including bit error rate (BER), and area density capability (ADC). After the best writer is determined, the slider is integrated in a HGA. Only the best writer is connected through trace lines to a preamp to enable functionality. At least one trace line has a plurality of arms that enable flexibility in connecting the best writer to the preamp while other arms are not connected. In some embodiments, all writers share a common W− pad that is connected to the preamp through one of two trace lines while the other trace line has one of the plurality of arms connected to the best writer.
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公开(公告)号：US10347276B2
公开(公告)日：2019-07-09
申请号：US15361721
申请日：2016-11-28
发明人： Yuhui Tang , Yaguang Wei , Jiun-Ting Lee
摘要： 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.
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75.发明申请公开(公告)号：US20190206428A1
公开(公告)日：2019-07-04
申请号：US16296349
申请日：2019-03-08
发明人： Ying Liu , Yuhui Tang , Jiun-Ting Lee , Yue Liu
CPC分类号： G11B5/112 , G11B5/1278 , G11B5/187 , G11B5/235 , G11B5/3116 , G11B5/313 , G11B5/3143 , G11B5/315 , G11B5/3169
摘要： 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：US20180330748A1
公开(公告)日：2018-11-15
申请号：US15595357
申请日：2017-05-15
发明人： Ying Liu , Yuhui Tang , Jiun-Ting Lee , Yue Liu
CPC分类号： G11B5/112 , G11B5/1278 , G11B5/187 , G11B5/235 , G11B5/3116 , G11B5/313 , G11B5/3143 , G11B5/315 , G11B5/3169
摘要： A PMR 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. As a result, 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：US20180308513A1
公开(公告)日：2018-10-25
申请号：US16022858
申请日：2018-06-29
发明人： Sanghyun Lim , Yuhui Tang , Yaguang Wei , Yue Liu , Moris Dovek
CPC分类号： G11B5/315 , G11B5/1278 , G11B5/3116
摘要： A method of forming a PMR (perpendicular magnetic recording) head that 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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78.发明申请公开(公告)号：US20180144768A1
公开(公告)日：2018-05-24
申请号：US15357105
申请日：2016-11-21
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 , G11B5/3912
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 8-16 kG portions on each side of a center stack with a lower write gap, a middle 19-24 kG (hot seed) layer, and an upper 16-24 kG TS layer each having a first cross-track width. The hot seed layer, upper 16-24 kG TS layer and an overlying PP3 trailing shield promote improved area density capability (ADC). A second 16-24 kG TS layer having a full width at the ABS may be formed on the first 16-24 kG TS layer.
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公开(公告)号：US20170133044A1
公开(公告)日：2017-05-11
申请号：US14933758
申请日：2015-11-05
发明人： Sanghyun Lim , Yuhui Tang , Yaguang Wei , Yue Liu , Moris Dovek
CPC分类号： G11B5/315 , G11B5/1278 , G11B5/3116
摘要： 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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80.发明授权High moment side shield design for area density improvement of perpendicular magnetic recording (PMR) writer 有权垂直磁记录（PMR）作者的面积密度改善的高矩侧面设计公开(公告)号：US09589582B2
公开(公告)日：2017-03-07
申请号：US15162091
申请日：2016-05-23
发明人： Yue Liu , Atsushi Yamaguchi , Yuhui Tang , Jiun-Ting Lee , Yaguang Wei , Xiaomin Liu , Hideyuki Ukita , Moris Dovek , Michitaka Nishiyama
CPC分类号： G11B5/3116 , G11B5/00826 , G11B5/11 , G11B5/1278 , G11B5/187 , G11B5/1871 , G11B5/23 , G11B5/315 , G11B5/3163 , G11B5/3912 , G11B5/6082
摘要： A PMR writer is disclosed wherein a hot seed layer (HS) made of a 19-24 kilogauss (kG) magnetic material is formed between a gap layer and a 10-16 kG magnetic layer in the side shields, and between the leading gap and a 16-19 kG magnetic layer in the leading shield to improve the track field gradient and cross-track field gradient while maintaining write-ability. The HS is from 10 to 100 nm thick and has a first side facing the write pole with a height of ≦0.15 micron, and a second side facing a main pole flared side that may extend to a full side shield height of ≦0.5 micron. The trailing shield has a second hot seed layer on the write gap and a 16-19 kG magnetic layer that contacts the 10-16 kG side shield magnetic layer thereby forming an all wrap around (AWA) shield configuration.
摘要翻译： 公开了一种PMR写入器，其中在侧面屏蔽之间的间隙层和10-16kG磁性层之间以及在前导间隙和第二磁性层之间形成由19-24千兆（kG）磁性材料制成的热种子层（HS） 一个16-19 kG的磁屏蔽层，以提高轨道场梯度和跨轨道场梯度，同时保持写入能力。 HS为10至100nm厚，并且具有面向高度≤0.15微米的写极的第一面和面向主极扩张侧的第二面，其可延伸至≤0.5微米的全侧屏蔽高度。 后屏蔽在写间隙上具有第二热种子层，以及接触10-16kG侧屏蔽磁性层的16-19kG磁性层，从而形成全包裹（AWA）屏蔽配置。
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