公开(公告)号：US12236984B2

公开(公告)日：2025-02-25

申请号：US17972514

申请日：2022-10-24

Applicant: Headway Technologies, Inc.

Inventor： Yue Liu ,  Moris Musa Dovek ,  Yan Wu

IPC: G11B5/127 ,  G11B5/23 ,  G11B5/235 ,  G11B5/31

Abstract: The present embodiments relate to a perpendicular magnetic recording (PMR) write head with a Tunable Pole Protrusion or Tunable Pole Performance (TPP) side bridge design. A PMR write head can include a main pole including a tip portion configured to be disposed at an air-bearing surface (ABS) and configured to interact with a magnetic recording medium. The PMR write head can also include a hot seed (HS) portion and a first write shield. The PMR write head can also include a first metallic side bridge disposed between the tip portion of the main pole and the HS portion. The PMR write head can also include a bias circuit including at least a first bias electrical pad and a second electrical bias pad directing an electrical current flow along an electrical path between the tip portion of the main pole and the write shield portion via the first metallic side bridge.

公开(公告)号：US12211526B2

公开(公告)日：2025-01-28

申请号：US18497867

申请日：2023-10-30

Applicant: Headway Technologies, Inc.

Inventor： Glen Garfunkel ,  Yan Wu ,  Wenyu Chen ,  Kunliang Zhang ,  Min Li ,  Shohei Kawasaki

IPC: G11B5/39 ,  G11B5/00 ,  G11B5/48

Abstract: A read head includes a permanent magnet (PM) layer formed up to 100 nm behind a free layer where PM layer magnetization may be initialized in a direction that adjusts free layer (FL) bias point, and shifts sensor asymmetry (Asym) closer to 0% for individual heads at slider or Head Gimbal Assembly level to provide a significant improvement in device yield. Asym is adjusted using different initialization schemes and initialization directions. With individual heads, initialization direction is selected based on a prior measurement of asymmetry. The PM layer is CoPt or CoCrPt and has coercivity from 500 Oersted to 1000 Oersted. The PM layer may have a width equal to the FL, or in another embodiment, the PM layer adjoins a backside of the top shield and has a width equal to or greater than that of the FL.

公开(公告)号：US12211525B2

公开(公告)日：2025-01-28

申请号：US18471031

申请日：2023-09-20

Applicant: Headway Technologies, Inc.

Inventor： Wenyu Chen ,  Yan Wu

IPC: G11B5/39 ,  G11B5/37

Abstract: A read head is disclosed wherein a Spin Hall Effect (SHE) layer is formed on a free layer (FL) in a sensor and between the FL and top shield (S2). Preferably, the sensor has a seed layer, an AP2 reference layer, antiferromagnetic coupling layer, AP1 reference layer, and a tunnel barrier sequentially formed on a bottom shield (S1). When the stripe heights of the FL and SHE layer are equal, a two terminal configuration is employed where a current flows between one side of the SHE layer to a center portion thereof and then to S1, or vice versa. As a result, a second spin torque is generated by the SHE layer on the FL that opposes a first spin torque from the AP1 reference layer on the FL.

公开(公告)号：US20240296860A1

公开(公告)日：2024-09-05

申请号：US18117135

申请日：2023-03-03

Applicant: Headway Technologies, Inc.

Inventor： Yue Liu ,  Moris Musa Dovek

IPC: G11B5/127 ,  G11B5/11 ,  G11B5/23

CPC classification number: G11B5/1278 ,  G11B5/11 ,  G11B5/23

Abstract: The present embodiments relate to a perpendicular magnetic recording (PMR) write head with a Two Tunable bias branch design that can electrical separate a WS1/PP3 and a SS/LS to form two tunable bias branches. A write head can include a main pole, a write gap(WG) disposed adjacent to the main pole, and a hot seed (HS) layer connected to the WG. The PMR write head can also include a trailing shield, a side shield and a leading shield. Two tunable bias branches can be formed to electrically separate the trailing shield and the side and leading shields. A first branch can include a first electrical path between the main pole and the trailing shield. The tunable bias branches can also include a second branch forming a second electrical path between the main pole and the side and leading shields.

公开(公告)号：US20240274152A1

公开(公告)日：2024-08-15

申请号：US18110347

申请日：2023-02-15

Applicant: Headway Technologies, Inc.

Inventor： Kei Hirata ,  Kowang Liu ,  Yue Liu ,  Jiun-Ting Lee ,  Weihao Xu

IPC: G11B5/11

CPC classification number: G11B5/11

Abstract: The present embodiments relate to a perpendicular magnetic recording (PMR) write head with an STO element and configured to direct an electric current between elements of the write head. A first example embodiment describes a perpendicular magnetic recording (PMR) write head. The PMR write head can include a main pole comprising a tip portion disposed adjacent to an air bearing surface (ABS) and is configured to interact with a magnetic recording medium. The PMR write head can also include a spin torque oscillator (STO) element disposed adjacent to the main pole. The PMR write head can also include a side shield layer with a portion of the side shield layer disposed adjacent to the ABS. The PMR write head can also include a metallic side gap layer disposed between the main pole and the side shield layer.

公开(公告)号：US11996126B2

公开(公告)日：2024-05-28

申请号：US17957304

申请日：2022-09-30

Applicant: Headway Technologies, Inc.

Inventor： Koji Shimazawa ,  Shengyuan Wang ,  Yukinori Ikegawa

IPC: G11B5/31 ,  B82Y20/00 ,  G02B5/00 ,  G11B7/1387 ,  G11B5/00

CPC classification number: G11B5/314 ,  B82Y20/00 ,  G02B5/008 ,  G11B5/3163 ,  G11B7/1387 ,  G11B2005/0021

Abstract: The present embodiments relate to a heat-assisted magnetic recording (HAMR) write head with an iridium (Ir) film. The Ir film can include a body layer and a plasmon generator (PG) film comprising Iridium with a thin Ir seed layer. The Ir seed layer can be in direct contact with a dielectric (aluminum oxide). The thickness of the Ir film can be 40 nanometers or less including both a body layer and the seed layer. Incorporating Iridium as a material used for a PG can be a high surface plasmon efficient material with also being reliable under high temperature irradiation during a heat-assisted writing process.

公开(公告)号：US20240135965A1

公开(公告)日：2024-04-25

申请号：US17972514

申请日：2022-10-23

Applicant: Headway Technologies, Inc.

Inventor： Yue Liu ,  Moris Musa Dovek ,  Yan Wu

IPC: G11B5/31 ,  G11B5/127

CPC classification number: G11B5/315 ,  G11B5/1278 ,  G11B5/3163

Abstract: The present embodiments relate to a perpendicular magnetic recording (PMR) write head with a Tunable Pole Protrusion or Tunable Pole Performance (TPP) side bridge design. A PMR write head can include a main pole including a tip portion configured to be disposed at an air-bearing surface (ABS) and configured to interact with a magnetic recording medium. The PMR write head can also include a hot seed (HS) portion and a first write shield. The PMR write head can also include a first metallic side bridge disposed between the tip portion of the main pole and the HS portion. The PMR write head can also include a bias circuit including at least a first bias electrical pad and a second electrical bias pad directing an electrical current flow along an electrical path between the tip portion of the main pole and the write shield portion via the first metallic side bridge.

公开(公告)号：US20240112693A1

公开(公告)日：2024-04-04

申请号：US17957304

申请日：2022-09-30

Applicant: Headway Technologies, Inc.

Inventor： Koji Shimazawa ,  Shengyuan Wang ,  Yukinori Ikegawa

IPC: G11B5/31 ,  B82Y20/00 ,  G02B5/00 ,  G11B7/1387

CPC classification number: G11B5/314 ,  B82Y20/00 ,  G02B5/008 ,  G11B5/3163 ,  G11B7/1387 ,  G11B2005/0021

Abstract: The present embodiments relate to a heat-assisted magnetic recording (HAMR) write head with an iridium (Ir) film. The Ir film can include a body layer and a plasmon generator (PG) film comprising Iridium with a thin Ir seed layer. The Ir seed layer can be in direct contact with a dielectric (aluminum oxide). The thickness of the Ir film can be 40 nanometers or less including both a body layer and the seed layer. Incorporating Iridium as a material used for a PG can be a high surface plasmon efficient material with also being reliable under high temperature irradiation during a heat-assisted writing process.

公开(公告)号：US20240071414A1

公开(公告)日：2024-02-29

申请号：US18497867

申请日：2023-10-30

Applicant: HeadWay Technologies, INC.

Inventor： Glen Garfunkel ,  Yan Wu ,  Wenyu Chen ,  Kunliang Zhang ,  Min Li ,  Shohei Kawasaki

IPC: G11B5/39

CPC classification number: G11B5/3932 ,  G11B5/3909 ,  G11B5/3912 ,  G11B2005/0018

Abstract: A read head includes a permanent magnet (PM) layer formed up to 100 nm behind a free layer where PM layer magnetization may be initialized in a direction that adjusts free layer (FL) bias point, and shifts sensor asymmetry (Asym) closer to 0% for individual heads at slider or Head Gimbal Assembly level to provide a significant improvement in device yield. Asym is adjusted using different initialization schemes and initialization directions. With individual heads, initialization direction is selected based on a prior measurement of asymmetry. The PM layer is CoPt or CoCrPt and has coercivity from 500 Oersted to 1000 Oersted. The PM layer may have a width equal to the FL, or in another embodiment, the PM layer adjoins a backside of the top shield and has a width equal to or greater than that of the FL.

公开(公告)号：US20240029759A1

公开(公告)日：2024-01-25

申请号：US17872831

申请日：2022-07-25

Applicant: Headway Technologies, Inc.

Inventor： Wenyu Chen ,  Zhenyao Tang ,  Shohei Kawasaki ,  Tetsuya Roppongi

IPC: G11B5/11 ,  G11B5/187

CPC classification number: G11B5/11 ,  G11B5/187 ,  G11B2005/0024

Abstract: The present embodiments relate to write heads implementing microwave-assisted magnetic recording utilizing multiple spin torque oscillators (STOs). Each STO can include a field-generation layer (FGL) that can oscillate in a same frequency and out of phase with one another. The layers in each STO can enable mutual spin transfer torques between adjacent layers, which can drive the FGLs into a large angle oscillation. The oscillation between the FGLs can cause a magnetic field to be generated that can assist in writing to a magnetic recording medium.