Ut Thieu Tran

US Patent:

8077557, Dec 13, 2011

Filed:

May 19, 2009

Appl. No.:

12/468813

Inventors:

Yufeng Hu - Fremont CA, US
Ruolin Li - Milpitas CA, US
Ut Tran - San Jose CA, US
Jinshan Li - San Jose CA, US

Assignee:

Western Digital (Fremont), LLC - Fremont CA

International Classification:

G11B 11/05

US Classification:

369 1324, 369 1333, 36911209, 385 12, 385 88, 385 89

Abstract:

A magnetic recording device comprises a multi-aperture vertical cavity surface emitting laser (VCSEL) operably coupled to a magnetic recording head and a plurality of waveguides disposed in the magnetic recording head. Each of the plurality of waveguides has a first end coupled to a different aperture of the multi-aperture VCSEL. The magnetic recording device further comprises a near field transducer disposed in the magnetic recording head. Each of the plurality of waveguides has a second end coupled to the near field transducer.

US Patent:

8125856, Feb 28, 2012

Filed:

Nov 5, 2009

Appl. No.:

12/613452

Inventors:

Ruolin Li - Milpitas CA, US
Ut Tran - San Jose CA, US
Yufeng Hu - Fremont CA, US
Jinshan Li - San Jose CA, US

Assignee:

Western Digital (Fremont), LLC - Fremont CA

International Classification:

G11B 11/00

US Classification:

369 1301

Abstract:

A method and system for providing an energy assisted magnetic recording (EAMR) disk drive are described. A media for storing data and a slider are provided. The slider has a back side, a trailing face, and an air-bearing surface (ABS) opposite to the back side. At least one laser is coupled with the trailing face of the slider, and has an optic axis substantially parallel to the trailing face. The laser(s) provide energy substantially along the optic axis. Optics are coupled with the trailing face of the slider and receive the energy from the laser(s) via free space. At least one EAMR transducer coupled with the slider. At least part of the EAMR transducer resides in proximity to the ABS. The optics direct the energy from the laser(s) to the EAMR transducer(s). The EAMR transducer(s) receive the energy from the optics and write to the media using the energy.

US Patent:

8200054, Jun 12, 2012

Filed:

Apr 19, 2009

Appl. No.:

12/426262

Inventors:

Ruolin Li - Milpitas CA, US
Yufeng Hu - Fremont CA, US
Ut Tran - San Jose CA, US

Assignee:

Western Digital (Fremont), LLC - Fremont CA

International Classification:

G02B 6/34
G11B 11/00
G11B 11/24

US Classification:

385 37, 369 133, 369 1333

Abstract:

A magnetic head comprising a waveguide coupler for coupling incident electromagnetic (EM) radiation into a waveguide is disclosed. The waveguide coupler includes a bottom clad layer and a waveguide core layer formed above the bottom clad layer. An interface between the bottom clad layer and the waveguide core layer includes a first grating having a first period and a first etch depth, which are configured to couple a first portion of the incident EM radiation into the waveguide core layer. The waveguide coupler can further comprise a top clad layer formed above the waveguide core layer. An interface between the waveguide core layer and the top clad layer includes a second grating having a second period and a second etch depth. The second period and the second etch depth are configured to couple a second portion of the incident EM radiation into the waveguide core layer.

US Patent:

8385158, Feb 26, 2013

Filed:

Oct 6, 2009

Appl. No.:

12/574621

Inventors:

Yufeng Hu - Fremont CA, US
Ut Tran - San Jose CA, US

Assignee:

Western Digital (Fremont), LLC - Fremont CA

International Classification:

G11B 11/00

US Classification:

369 1301

Abstract:

A method and system for fabricating an energy assisted magnetic recording (EAMR) transducer is described. The EAMR transducer has an air-bearing surface (ABS) and a waveguide. The method includes providing a planarized near field transducer (NFT) for the waveguide and forming a sloped surface on the planarized NFT. The sloped surface has a front edge separated from the ABS by a distance. The method and system also include providing a write pole on the sloped surface.

US Patent:

8456963, Jun 4, 2013

Filed:

Apr 12, 2010

Appl. No.:

12/758319

Inventors:

Yufeng Hu - Fremont CA, US
Ruolin Li - Milpitas CA, US
Ut Tran - San Jose CA, US
Jinshan Li - San Jose CA, US

Assignee:

Western Digital (Fremont), LLC - Fremont CA

International Classification:

G11B 11/00

US Classification:

369 1333, 369 1313

Abstract:

An energy assisted magnetic recording (EAMR) disk drive comprises a suspension and a slider having a back side, a laser-facing surface, and an air-bearing surface (ABS) opposite the back side. The slider is mounted to the suspension on the back side. The disk drive further comprises an EAMR transducer coupled with the slider, a portion of the EAMR transducer residing in proximity to the ABS and on the laser-facing surface of the slider. The disk drive further comprises a laser coupled with the suspension and having a light emitting surface facing the laser-facing surface of the slider. The laser has an optic axis substantially parallel to the suspension. The laser provides energy substantially along the optic axis and is optically coupled with the EAMR transducer via free space. The EAMR transducer receives the energy from the laser and writes to the media using the energy.

US Patent:

8456964, Jun 4, 2013

Filed:

Nov 16, 2010

Appl. No.:

12/947085

Inventors:

Hongxing Yuan - San Ramon CA, US
Shing Lee - Fremont CA, US
Zhong Shi - Dublin CA, US
Jinshan Li - San Jose CA, US
Ut Tran - San Jose CA, US

Assignee:

Western Digital (Fremont), LLC - Fremont CA

International Classification:

G11B 11/00

US Classification:

369 1333, 369 1313

Abstract:

A method and system for providing an EAMR transducer is described. The EAMR transducer is coupled with a laser for providing energy and has an ABS that resides near a media during use. The EAMR transducer includes a write pole, coil(s) that energize the pole, a near field transducer (NFT) proximate to the ABS, a waveguide, and a reflector. The write pole has a back gap region and writes to a region of the media. The NFT focuses the energy onto the media. The waveguide directs the energy from the laser toward the NFT at an incident angle with respect to the ABS. A first portion of the energy reflects off of the ABS at a reflected angle. The reflector receives the first portion of the energy from the ABS and reflects a second portion of the energy toward the ABS. The NFT resides between the waveguide and the reflector.