公开(公告)号：US20220223176A1

公开(公告)日：2022-07-14

申请号：US17708222

申请日：2022-03-30

Applicant: Headway Technologies, Inc.

Inventor： Ying Liu ,  Yuhui Tang ,  Yue Liu ,  Kei Hirata

IPC: G11B5/11

Abstract: 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.

公开(公告)号：US11348605B1

公开(公告)日：2022-05-31

申请号：US16953925

申请日：2020-11-20

Applicant: Headway Technologies, Inc.

Inventor： Ying Liu ,  Yuhui Tang ,  Yue Liu ,  Jiun-Ting Lee ,  Shengyuan Wang ,  Xiaomin Liu

IPC: G11B5/31 ,  G11B5/23 ,  G11B5/48 ,  G11B5/11 ,  G11B5/127 ,  G11B5/00

Abstract: 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.

公开(公告)号：US11031039B1

公开(公告)日：2021-06-08

申请号：US16997161

申请日：2020-08-19

Applicant: Headway Technologies, Inc.

Inventor： Yuhui Tang ,  Ying Liu

IPC: G11B5/00 ,  G11B20/10 ,  G11B5/012 ,  G11B21/16

Abstract: A preamplifier that that is configured for optimizing the write current waveform to achieve the best areal density capability (ADC) and adjacent track interference (ATI) performance of a magnetic recording disk drive. The preamplifier is configured for providing a magnetic head write current with a main pole relaxation zone for providing a buffer zone for main pole relaxation from saturation state to a remanence state before writing the next bit. The preamplifier is further configured for providing a magnetic head write current with a reference main pole relaxation current located at an end region data of each bit. The length of the reference main pole relaxation current is a function of the bit length, frequency, recording velocity, and writer/media switching speed.

公开(公告)号：US10950257B2

公开(公告)日：2021-03-16

申请号：US16190790

申请日：2018-11-14

Applicant: Headway Technologies, Inc.

Inventor： Yuhui Tang ,  Ying Liu ,  Min Li

IPC: G11B5/127 ,  H04R31/00 ,  G11B5/23 ,  G11B5/147 ,  C23C14/04

Abstract: A method of forming a spin torque assisted magnetic recording writer is disclosed wherein a spin flipping (STO) device is recessed from an air bearing surface. The STO device has a middle flux guiding layer with a magnetization that flips to a direction anti-parallel to the write gap field when a current of sufficient magnitude is applied from the trailing shield towards the main pole (MP) thereby increasing reluctance in the write gap to enhance writability. A STO stack is deposited and patterned to define a cross-track width on the MP tapered trailing side. Thereafter, the STO stack is patterned to define a STO device with a front side recessed from the air bearing surface, and a backside. A write gap is deposited surrounding the STO device, and has a thickness greater than or ≤ to STO thickness to enable design flexibility. Then, first and second trailing shields are formed.

公开(公告)号：US10339964B1

公开(公告)日：2019-07-02

申请号：US15984680

申请日：2018-05-21

Applicant: Headway Technologies, Inc.

Inventor： Ying Liu ,  Yue Liu ,  Yuhui Tang ,  Kei Hirata

IPC: G11B5/147 ,  G11B5/127 ,  G11B5/11 ,  G11B5/31

Abstract: A perpendicular magnetic recording writer is disclosed wherein a first trailing shield (HMTS) layer has a down-track (DT) thickness d in portions thereof proximate to a center plane that bisects the main pole tip trailing side to enable enhanced trailing shield return field at track center thereby improving bits per inch (BPI) capability. Meanwhile, at off track center positions, that in some embodiments are from 25 nm to 500 nm from the center plane, the HMTS layer has a DT thickness d1, where d1>d, and a smaller dielectric gap between the HMTS layer and the main pole thereby protecting side shield return field and adjacent track interference (ATI) performance. A method of forming the HMTS layer on a write gap is provided and includes patterning the HMTS layer in a back portion to form openings that are filled with the smaller dielectric gap and HTMS layer thickness d1.

公开(公告)号：US10325618B1

公开(公告)日：2019-06-18

申请号：US16037197

申请日：2018-07-17

Applicant: Headway Technologies, Inc.

Inventor： Yan Wu ,  Yuhui Tang ,  Wenyu Chen ,  Ying Liu

IPC: G11B5/11 ,  G11B5/127

Abstract: A perpendicular 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 flux guiding element is formed in at least one gap and comprises an inner non-spin preserving layer adjoining the MP, a middle flux guiding layer (FGL), and an outer spin preserving layer. A key feature is that the FGL has a magnetization that may be aligned anti-parallel to a gap field during a write process when a current of sufficient magnitude is applied from the adjacent shield towards the MP thereby increasing reluctance in the gap and forcing additional flux out of the MP at the air bearing surface to enhance writability on a magnetic recording medium.

公开(公告)号：US10311899B2

公开(公告)日：2019-06-04

申请号：US15990092

申请日：2018-05-25

Applicant: Headway Technologies, Inc.

Inventor： Yue Liu ,  Ying Liu ,  Yuhui Tang ,  Jiun-Ting Lee ,  Moris Dovek ,  Yiming Wang

IPC: G11B5/31 ,  G11B5/127 ,  G11B5/187 ,  G11B5/39 ,  G11B5/008

Abstract: 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, 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.

公开(公告)号：US10109304B1

公开(公告)日：2018-10-23

申请号：US15654199

申请日：2017-07-19

Applicant: Headway Technologies, Inc.

Inventor： Ying Liu ,  Yuhui Tang ,  Jiun-Tlng Lee ,  Yue Liu

IPC: G11B5/127 ,  G11B5/31 ,  G11B5/11 ,  G11B5/235

Abstract: A PMR (perpendicular magnetic recording) head includes a tapered main write pole (MP) with a beveled face and thin, laterally disposed side shields (SS) that do not fully extend along the sides on the write pole in the down-track direction. Denoting the down-track thickness of the side shields as SSt, that thickness satisfies 0

公开(公告)号：US09990942B1

公开(公告)日：2018-06-05

申请号：US15357105

申请日：2016-11-21

Applicant: Headway Technologies, Inc.

Inventor： Yue Liu ,  Ying Liu ,  Yuhui Tang ,  Jiun-Ting Lee ,  Moris Dovek ,  Yiming Wang

IPC: G11B5/187 ,  G11B5/31 ,  G11B5/127 ,  G11B5/39 ,  G11B5/008

CPC classification number: G11B5/3116 ,  G11B5/00826 ,  G11B5/1278 ,  G11B5/187 ,  G11B5/3912

Abstract: 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 on each side of a center stack with a lower write gap, a middle hot seed layer having a 19-24 kG saturation magnetic moment, and an upper magnetic layer with a 16-24 kG saturation magnetic moment, and each having a first cross-track width. The hot seed layer, upper TS magnetic layer and an overlying PP3 trailing shield promote improved area density capability (ADC).

公开(公告)号：US09721604B2

公开(公告)日：2017-08-01

申请号：US15222412

申请日：2016-07-28

Applicant: Headway Technologies, Inc.

Inventor： Yuhui Tang ,  Yaguang Wei ,  Jiun-Ting Lee ,  Ping-Wei Zhuang

IPC: G11B5/127 ,  G11B5/60 ,  G11B5/31 ,  G11B5/11

CPC classification number: G11B5/6082 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/3116 ,  G11B5/315

Abstract: A perpendicular magnetic recording writer is disclosed with a side shield separated from a write pole side by a gap layer at an air bearing surface (ABS) where the side shield has a first sidewall facing the write pole with an end at height (h1) from the ABS, and a second sidewall at height h1 that is parallel to the ABS. The write pole side is curved such that a first portion proximate to the ABS is at an angle of 0 to 40 degrees with respect to a center plane formed orthogonal to the ABS, and a second section proximate to a corner where the curved side connects with a flared main pole side is formed substantially parallel to the second sidewall. When h1 is 30-80 nm, and the corner is 80-150 nm from the ABS, overwrite is improved while cross-track field gradient is enhanced.