Patents by Inventor Ut Tran
Ut Tran has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8491801Abstract: A method and system provides a near-field transducer (NFT) for an energy assisted magnetic recording (EAMR) transducer. The method and system include forming a sacrificial NFT structure having a shape a location corresponding to the NFT. A dielectric layer is deposited. A portion of the dielectric layer resides on the sacrificial NFT structure. At least this portion of the dielectric layer on the sacrificial structure is removed. The sacrificial NFT structure is removed, exposing an NFT trench in the dielectric layer. At least one conductive layer for the NFT is deposited. A first portion of the conductive layer(s) reside in the NFT trench. A second portion of the conductive layer(s) external to the NFT trench is removed to form the NFT.Type: GrantFiled: November 8, 2011Date of Patent: July 23, 2013Assignee: Western Digital (Fremont), LLCInventors: Shawn M. Tanner, Yufeng Hu, Ut Tran, Zhongyan Wang
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Patent number: 8488272Abstract: A magnetic recording transducer includes a main pole including a nose portion, the nose portion terminating at an air-bearing surface (ABS). The magnetic recording transducer further includes at least one coil having a coil front distal from the ABS, and at least one side shield, the at least one side shield extending from at the ABS to not further than the coil front.Type: GrantFiled: March 29, 2012Date of Patent: July 16, 2013Assignee: Western Digital (Fremont), LLCInventors: Ut Tran, Zhigang Bai, Kevin K. Lin
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Patent number: 8456963Abstract: 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.Type: GrantFiled: April 12, 2010Date of Patent: June 4, 2013Assignee: Western Digital (Fremont), LLCInventors: Yufeng Hu, Ruolin Li, Ut Tran, Jinshan Li
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Patent number: 8456964Abstract: 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.Type: GrantFiled: November 16, 2010Date of Patent: June 4, 2013Assignee: Western Digital (Fremont), LLCInventors: Hongxing Yuan, Shing Lee, Zhong Shi, Jinshan Li, Ut Tran
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Patent number: 8385158Abstract: 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.Type: GrantFiled: October 6, 2009Date of Patent: February 26, 2013Assignee: Western Digital (Fremont), LLCInventors: Yufeng Hu, Ut Tran
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Patent number: 8339738Abstract: A method for fabricating a magnetic transducer having an air-bearing surface (ABS) is provided. The method comprises providing an underlayer, and providing a main pole residing on the underlayer and having a front and a rear. The step of providing a main pole further includes providing a first portion having a first magnetic moment, the first portion having a front face at the ABS and terminating between the ABS and the rear of the main pole, and providing a second portion having a second magnetic moment. A part of the second portion resides on the first portion, and another part of the second portion resides between the first portion of the main pole and the rear of the main pole. The first magnetic moment is less than the second magnetic moment.Type: GrantFiled: June 20, 2012Date of Patent: December 25, 2012Assignee: Western Digital (Fremont), LLCInventors: Ut Tran, Zhigang Bai
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Patent number: 8307540Abstract: A method provides an EAMR transducer. A sacrificial post is provided on an NFT distal from the ABS. This post has an edge proximate and substantially parallel to the ABS. A sacrificial mask is provided on the NFT between the post and the ABS. Optical material(s) are provided. The post is between the optical material(s) and the ABS. The post is removed. A heat sink post corresponding to the post is provided. The heat sink post has a bottom thermally coupled with the NFT and an edge proximate and substantially parallel to the ABS. Part of the heat sink post is removed, forming a heat sink having a top surface at an acute angle from the ABS. Nonmagnetic material(s) are provided on the optical material(s). A pole having a bottom surface thermally coupled with the heat sink and coil(s) are provided.Type: GrantFiled: March 10, 2011Date of Patent: November 13, 2012Assignee: Western Digital (Fremont), LLCInventors: Ut Tran, Kevin K. Lin, Yufeng Hu
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Patent number: 8276258Abstract: A method and system provide a magnetic transducer that includes an underlayer and a first nonmagnetic layer on the underlayer. The method and system include providing a first trench in the first nonmagnetic layer. The first trench has at least one edge corresponding to at least one side shield. The method and system also include providing a second nonmagnetic layer in the first trench and providing a second trench in the second nonmagnetic layer. The method and system include providing the main pole. At least part of the main pole resides in the second trench. The method and system further include removing at least a portion of the second nonmagnetic layer between the edge(s) and the main pole. The method and system also provide the side shield(s) in the first trench. The side shield(s) extend from at least an air-bearing surface location to not further than a coil front location.Type: GrantFiled: August 26, 2008Date of Patent: October 2, 2012Assignee: Western Digital (Fremont), LLCInventors: Ut Tran, Zhigang Bai
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Patent number: 8277669Abstract: A method and system for providing a pole of magnetic transducer having an air-bearing surface (ABS) are described. Leading shield and planarization stop layers are provided. Portions of the planarization stop and shield layers distal from the ABS location are removed, providing a depression forming a bevel. The bevel has an angle greater than zero and less than ninety degrees. An intermediate layer having a top surface substantially perpendicular to the ABS location is provided. Part of the intermediate layer is removed, forming a trench having a bottom corresponding to the leading shield and a location and profile corresponding to the pole. A nonmagnetic layer is provided at least partially in the trench. The pole with a leading edge bevel corresponding to the bevel is provided in the trench. A capping layer covering the pole is provided, at least part of the intermediate layer removed, and a wrap-around shield provided.Type: GrantFiled: December 21, 2009Date of Patent: October 2, 2012Assignee: Western Digital (Fremont), LLCInventors: Tsung Yuan Chen, Yimin Guo, Jinqiu Zhang, Ut Tran
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Patent number: 8228633Abstract: A method and system provide a magnetic transducer that includes an air-bearing surface (ABS). The magnetic transducer includes an underlayer and a main pole residing on the underlayer. The main pole includes a front and a rear. The front resides at the ABS, while the rear is distal from the ABS. The main pole also includes a first portion having a first magnetic moment and a second portion having a second magnetic moment. The first portion has a front face at the ABS and terminates between the ABS and the rear of the main pole. A part of the second portion resides on the first portion, while another part of the second portion resides between the first portion of the main pole and the rear of the main pole. The first magnetic moment is less than the second magnetic moment.Type: GrantFiled: August 21, 2008Date of Patent: July 24, 2012Assignee: Western Digital (Fremont), LLCInventors: Ut Tran, Zhigang Bai
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Patent number: 8200054Abstract: 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.Type: GrantFiled: April 19, 2009Date of Patent: June 12, 2012Assignee: Western Digital (Fremont), LLCInventors: Ruolin Li, Yufeng Hu, Ut Tran
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Patent number: 8166631Abstract: A method provides a magnetic transducer that includes an underlayer and a nonmagnetic layer on the underlayer. The method includes providing a plurality of trenches in the nonmagnetic layer. A first trench of corresponds to a main pole, while at least one side trench corresponds to at least one side shield. The method also includes providing mask covering the side trench(es) and providing the main pole. At least a portion of the main pole resides in the first trench. The method also includes removing at least a portion of the nonmagnetic layer residing between the side trench(es) and the main pole. The method also includes providing at least one side shield. The shield(s) extend from at least an air-bearing surface location to not further than a coil front location.Type: GrantFiled: August 27, 2008Date of Patent: May 1, 2012Assignee: Western Digital (Fremont), LLCInventors: Ut Tran, Zhigang Bai, Kevin K. Lin
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Patent number: 8125856Abstract: 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.Type: GrantFiled: November 5, 2009Date of Patent: February 28, 2012Assignee: Western Digital (Fremont), LLCInventors: Ruolin Li, Ut Tran, Yufeng Hu, Jinshan Li
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Patent number: 8098999Abstract: A tunable filter may be utilized to successively tune to different wavelengths. As each wavelength of the wavelength division multiplexed signal is extracted, it may be successively power monitored. Thus, power monitoring may done without requiring separate power monitors for each channel. This results in considerable advantages in some embodiments, including reduced size, reduced complexities in fabrication, and reduced yield issues in some embodiments.Type: GrantFiled: June 19, 2003Date of Patent: January 17, 2012Assignee: Intel CorporationInventors: Ruolin Li, Anders Grunnet-Jepsen, John Sweetser, Ut Tran
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Patent number: 8077434Abstract: A method and system for providing a magnetic transducer having an air-bearing surface (ABS) are described. The magnetic transducer includes a base layer, a perpendicular magnetic recording (PMR) pole on the base layer, an additional pole, a write shield, a write gap between the PMR pole and a portion of the write shield, and coil(s) that energize at least the additional pole. The base layer includes a first portion proximate to the ABS and a second portion recessed from the ABS. The first portion is nonmagnetic, while the second portion is magnetic. The PMR pole has a first front portion proximate to the ABS. The additional pole has a second front portion recessed from the ABS. At least a portion of the additional pole resides between the PMR pole and write shield. At least a portion of the write gap resides on the front portion of the PMR pole.Type: GrantFiled: November 19, 2007Date of Patent: December 13, 2011Assignee: Western Digital (Fremont), LLCInventors: Yong Shen, Lei Larry Zhang, Yingjian Chen, Ut Tran
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Patent number: 8077557Abstract: 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.Type: GrantFiled: May 19, 2009Date of Patent: December 13, 2011Assignee: Western Digital (Fremont), LLCInventors: Yufeng Hu, Ruolin Li, Ut Tran, Jinshan Li
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Patent number: 8057108Abstract: Embodiments of an optical detection apparatus are disclosed which may include one or more of a waveguide, a trench formed in the waveguide, a reflective surface, and a photodetector. The waveguide may be formed in a semiconductor substrate to propagate an optical signal received at a first end of the waveguide. The trench may also be formed in the waveguide having a first sidewall and a second sidewall, the first and second sidewalls forming first and second angles with the waveguide's propagation direction. The second sidewall may include a reflective surface formed thereon. The photodetector may be configured to receive an optical signal propagated in the waveguide, through the first sidewall and reflected from the reflective surface on the second sidewall.Type: GrantFiled: July 30, 2010Date of Patent: November 15, 2011Assignee: Intel CorporationInventors: Achintya K. Bhowmik, Nagesh K. Vodrahalli, Gennady Farber, Hai-Feng Liu, Hamid Eslampour, Ut Tran, William B. Wong, Ruolin Li, Jesper Arentoft Jayaswal
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Publication number: 20100296773Abstract: Embodiments of an optical detection apparatus are disclosed which may include one or more of a waveguide, a trench formed in the waveguide, a reflective surface, and a photodetector. The waveguide may be formed in a semiconductor substrate to propagate an optical signal received at a first end of the waveguide. The trench may also be formed in the waveguide having a first sidewall and a second sidewall, the first and second sidewalls forming first and second angles with the waveguide's propagation direction. The second sidewall may include a reflective surface formed thereon. The photodetector may be configured to receive an optical signal propagated in the waveguide, through the first sidewall and reflected from the reflective surface on the second sidewall.Type: ApplicationFiled: July 30, 2010Publication date: November 25, 2010Inventors: Achintya K. Bhowmik, Nagesh K. Vodrahalli, Gennady Farber, Hai-Feng Liu, Hamid Eslampour, Ut Tran, William B. Wong, Ruolin Lin, Jesper Arentoft Jayaswal
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Patent number: 7780360Abstract: Embodiments of an optical detection apparatus are disclosed which may include one or more of a waveguide, a trench formed in the waveguide, a reflective surface, and a photodetector. The waveguide may be formed in a semiconductor substrate to propagate an optical signal received at a first end of the waveguide. The trench may also be formed in the waveguide having a first sidewall and a second sidewall, the first and second sidewalls forming first and second angles with the waveguide's propagation direction. The second sidewall may include a reflective surface formed thereon. The photodetector may be configured to receive an optical signal propagated in the waveguide, through the first sidewall and reflected from the reflective surface on the second sidewall.Type: GrantFiled: July 21, 2008Date of Patent: August 24, 2010Assignee: Intel CorporationInventors: Achintya K. Bhowmik, Nagesh K. Vodrahalli, Gennady Farber, Hai-Feng Liu, Hamid Eslampour, Ut Tran, William B. Wong, Ruolin Li, Jesper Arentoft Jayaswal
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Publication number: 20090226135Abstract: Optical components may be precisely positioned in three dimensions with respect to one another. A bonder which has the ability to precisely position the components in two dimensions can be utilized. The components may be equipped with contacts at different heights so that as the components come together in a third dimension, their relative positions can be sensed. This information may be fed back to the bonder to control the precise alignment in the third dimension.Type: ApplicationFiled: May 12, 2009Publication date: September 10, 2009Inventors: Ut Tran, Hamid Eslampour