Xiaomin Liu

US Patent:

7293344, Nov 13, 2007

Filed:

Jul 8, 2004

Appl. No.:

10/886888

Inventors:

Laurie Lauchlan - Saratoga CA, US
Xiaomin Liu - Milpitas CA, US

Assignee:

Headway Technologies, Inc. - Milpitas CA

International Classification:

G11B 5/127
B44C 1/22

US Classification:

2960313, 2960314, 2960312, 360119, 360122, 360125, 427130, 2041921, 20419234

Abstract:

A process for achieving tighter reader and writer track width control is disclosed. The write gap layer is used as the plating seed on which the upper pole is electro-formed. This allows the write gap layer to then be deposited through a precisely controllable process such as sputtering. Since less material needs to be removed during pole trimming, a thinner layer of photoresist may be used, resulting in improved dimensional control.

US Patent:

8118990, Feb 21, 2012

Filed:

May 10, 2006

Appl. No.:

11/431261

Inventors:

Xiaomin Liu - Fremont CA, US
Feiyue Li - Fremont CA, US

Assignee:

Headway Technologies, Inc. - Milpitas CA

International Classification:

C25D 3/56

US Classification:

205259, 205255

Abstract:

A process is described for the fabrication, through electrodeposition, of FeCoNi(x=60-71, y=25-35, z=0-5) films that have, in their as-deposited form, a saturation magnetization of at least 24 kG and a coercivity of less than 0. 3 Oe. A key feature is the addition of aryl sulfinates to the plating bath along with a suitable seed layer.

US Patent:

8177955, May 15, 2012

Filed:

Jun 3, 2004

Appl. No.:

10/860716

Inventors:

Feiyue Li - Fremont CA, US
Xiaomin Liu - Milpitas CA, US

Assignee:

Headway Technologies, Inc. - Milpitas CA

International Classification:

C25D 3/56

US Classification:

205255, 205119

Abstract:

A magnetic layer that may serve as a top pole layer and bottom pole layer in a magnetic write head is disclosed. The magnetic layer has a composition represented by FeCoNiVin which w, x, y, and z are the atomic % of Fe, Co, Ni, and V, respectively, and where w is between about 60 and 85, x is between about 10 and 30, y is between 0 and about 20, z is between about 0. 1 and 3, and wherein w+x+y+z=100. An electroplating process having a plating current density of 3 to 30 mA/cmis used to deposit the magnetic layer and involves an electrolyte solution with a small amount of VOSOwhich is the V source. The resulting magnetic layer has a magnetic saturation flux density Bgreater than 1. 9 Telsa and a resistivity ρ higher than 70 μohms-cm.

US Patent:

8329320, Dec 11, 2012

Filed:

Nov 13, 2008

Appl. No.:

12/291715

Inventors:

Kunliang Zhang - Fremont CA, US
Min Li - Dublin CA, US
Min Zheng - Milpitas CA, US
Fenglin Liu - Milpitas CA, US
Xiaomin Liu - Fremont CA, US

Assignee:

Headway Technologies, Inc. - Milpitas CA

International Classification:

G11B 5/31
G11B 5/127

US Classification:

428812, 428815, 360324, 360325, 36012501

Abstract:

A laminated high moment film with a non-AFC configuration is disclosed that can serve as a seed layer for a main pole layer or as the main pole layer itself in a PMR writer. The laminated film includes a plurality of (B/M) stacks where B is an alignment layer and M is a high moment layer. Adjacent (B/M) stacks are separated by an amorphous layer that breaks the magnetic coupling between adjacent high moment layers and reduces remanence in a hard axis direction while maintaining a high magnetic moment and achieving low values for Hch, Hce, and Hk. The amorphous material layer may be made of an oxide, nitride, or oxynitride of one or more of Hf, Zr, Ta, Al, Mg, Zn, Ti, Cr, Nb, or Si, or may be Hf, Zr, Ta, Nb, CoFeB, CoB, FeB, or CoZrNb. Alignment layers are FCC soft ferromagnetic materials or non-magnetic FCC materials.

US Patent:

8568909, Oct 29, 2013

Filed:

May 11, 2012

Appl. No.:

13/469856

Inventors:

Feiyue Li - Fremont CA, US
Xiaomin Liu - Milpitas CA, US

Assignee:

Headway Technologies, Inc. - Milpitas CA

International Classification:

G11B 5/127
G11B 5/187
G11B 5/31
C22C 38/10
C22C 38/12

US Classification:

428812, 428816, 36012506, 3601253, 36012543, 36012571, 360128

Abstract:

A magnetic layer that may serve as a top pole layer and bottom pole layer in a magnetic write head is disclosed. The magnetic layer has a composition represented by FeCoNiVin which w, x, y, and z are the atomic % of Fe, Co, Ni, and V, respectively, and where w is between about 60 and 85, x is between about 10 and 30, y is between 0 and about 20, z is between about 0. 1 and 3, and wherein w+x+y+z=100. An electroplating process having a plating current density of 3 to 30 mA/cmis used to deposit the magnetic layer and involves an electrolyte solution with a small amount of VOSOwhich is the V source. The resulting magnetic layer has a magnetic saturation flux density Bgreater than 1. 9 Telsa and a resistivity ρ higher than 70 μohms-cm.

US Patent:

20050180049, Aug 18, 2005

Filed:

Feb 17, 2004

Appl. No.:

10/780514

Inventors:

Lei Zhang - San Jose CA, US
Xiaomin Liu - Milpitas CA, US

International Classification:

G11B005/147

US Classification:

360126000

Abstract:

For high track density recording, tighter reader and writer track width control are essential. This has been achieved by using a plated NiPd write gap which is self-aligned with a plated 23 KG pole material. Heat dissipation by the writer is thus improved since alumina has been replaced with nonmagnetic metal materials, such as Ru, leading to less pole tip protrusion which in turn leads to better writer track width control

US Patent:

20080055787, Mar 6, 2008

Filed:

Oct 23, 2007

Appl. No.:

11/975955

Inventors:

Laurie Lauchlan - Saratoga CA, US
Xiaomin Liu - Milpitas CA, US

International Classification:

G11B 5/127
G11B 5/33

US Classification:

360319000

Abstract:

For high track density recording, tighter reader and writer track width control are essential. This has been achieved by using the write gap layer as the plating seed on which the upper pole was electro-formed so that the width of the GMR pedestal serves to define the device's write track width.

US Patent:

20080197021, Aug 21, 2008

Filed:

Feb 16, 2007

Appl. No.:

11/707826

Inventors:

Xiaomin Liu - Fremont CA, US
Feiyue Li - Fremont CA, US

International Classification:

C25D 5/50

US Classification:

205 90, 148108

Abstract:

A process sequence for forming a soft magnetic layer having Hce and Hch of ≦2 Oe, Hk≦5 Oe, and Bs of ≧24 kG is disclosed. A CoFe or CoFe alloy is electroplated in a 10C to 25C. bath (pH 2 to 3) containing Coand Feions in addition to boric acid and one or more aryl sulfinate salts to promote magnetic softness in the deposited layer. Peak current density is 30 to 60 mA/cm. A two step magnetic anneal process is performed to further improve softness. An easy axis anneal is followed by a hard axis anneal or vice versa. In an embodiment where the magnetic layer is a pole layer in a write head, the temperature is maintained in a 180C to 250C range and the applied magnetic field is kept a 300 Oe or below to prevent degradation of an adjacent read head.

Address:

41377 Danzon Ct, Fremont, CA 94539

Phone:

(510)6231772

VIN:

WDDHF5GB7BA474777

Make:

MERCEDES-BENZ

Model:

E-CLASS

Year:

2011