Yiming Wang

US Patent:

20190295571, Sep 26, 2019

Filed:

May 29, 2019

Appl. No.:

16/424622

Inventors:

- Milpitas CA, US
Ying Liu - San Jose CA, US
Yuhui Tang - Milpitas CA, US
Moris Dovek - San Jose CA, US
Yiming Wang - San Jose CA, US

International Classification:

G11B 5/31
G11B 5/187
G11B 5/127

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.

US Patent:

20180277147, Sep 27, 2018

Filed:

May 25, 2018

Appl. No.:

15/990092

Inventors:

- Milpitas CA, US
Ying Liu - San Jose CA, US
Yuhui Tang - Milpitas CA, US
Moris Dovek - San Jose CA, US
Yiming Wang - San Jose CA, US

International Classification:

G11B 5/31
G11B 5/187
G11B 5/127
G11B 5/008
G11B 5/39

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, 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.

US Patent:

20180182419, Jun 28, 2018

Filed:

Dec 11, 2017

Appl. No.:

15/837205

Inventors:

- Milpitas CA, US
Kouji Shimazawa - Nagano, JP
Tobias Maletzky - San Jose CA, US
Weihao Xu - San Jose CA, US
Shinji Hara - Nagano, JP
Yoshihiro Tsuchiya - Nagano, JP
Yiming Wang - San Jose CA, US
Xuhui Jin - San Jose CA, US

International Classification:

G11B 5/48
G11B 5/60
G11B 5/31
G11B 11/105
G11B 5/00

Abstract:

A TAMR (thermal assisted magnetic recording) write head and a method of its fabrication. The write head has a metal blocker formed against a distal end of a waveguide. The waveguide focuses optical radiation on an adjacent plasmon generator where it excites plasmon modes that heat the recording medium. Although the plasmon generator typically heats the recording medium using the plasmon near field to supply the required Joule heating, an unblocked waveguide would also send optical radiation to the medium and surrounding structures producing unwanted heating and device unreliability. The role of the blocker is to block the unwanted optical radiation and, thereby, to limit the heating to that supplied by the plasmon near field.

US Patent:

20180144768, May 24, 2018

Filed:

Nov 21, 2016

Appl. No.:

15/357105

Inventors:

- Milpitas CA, US
Ying Liu - San Jose CA, US
Yuhui Tang - Milpitas CA, US
Moris Dovek - San Jose CA, US
Yiming Wang - San Jose CA, US

International Classification:

G11B 5/60
G11B 5/127

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 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.

US Patent:

20140133283, May 15, 2014

Filed:

Nov 14, 2012

Appl. No.:

13/676490

Inventors:

- Milpitas CA, US
Xuhui Jin - San Jose CA, US
Yiming Wang - San Jose CA, US
Dayu Zhou - Fremont CA, US
Joe Smyth - Aptos CA, US
Moris Dovek - San Jose CA, US

Assignee:

HEADWAY TECHNOLOGIES, INC. - Milpitas CA

International Classification:

G11B 13/04

US Classification:

369 1333

Abstract:

A TAMR (Thermal Assisted Magnetic Recording) write head uses the near field energy of optical-laser excited plasmon eigenmodes in a plasmon resonator to locally heat a magnetic recording medium and reduce its coercivity and magnetic anisotropy. The plasmon resonator is formed as a conducting disk-shaped structure with an extending peg that serves to further confine the near fields within a small region of the recording medium. The resonator eigenmodes are excited, through direct or evanescent coupling, by an interference pattern formed by the overlap of optical waves within a dual-channel waveguide, the interference pattern being the result of the waves in one branch being phase-shifted relative to the waves in the other branch.