Patents by Inventor Chunhong Hou
Chunhong Hou 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: 8929030Abstract: A writer includes a write element having a tip portion to generate a write field during a write operation and a conductive assembly that delivers a write assist current through the tip portion in a cross-track direction to generate a write assist field during the write operation that extends beyond a medium confronting surface located at the tip portion to lower a coercivity of a magnetic medium proximate to the write element.Type: GrantFiled: March 15, 2007Date of Patent: January 6, 2015Assignee: Seagate Technology LLCInventors: Chunhong Hou, Shaoping Li, John M. Wolf, Sining Mao
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Patent number: 7561379Abstract: A perpendicular writer includes a surface, a main pole proximate the surface, a return pole proximate the surface, and a back yoke connecting the main pole to the return pole distal the surface. The return pole is configured such that a magnetization of a portion of the return pole adjacent the surface is held substantially parallel to the surface during a write operation.Type: GrantFiled: October 28, 2005Date of Patent: July 14, 2009Assignee: Seagate Technology LLCInventors: Shaoping Li, Lei Wang, Chunhong Hou, Song S. Xue, Daniel John Brown
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Publication number: 20080225435Abstract: A writer includes a write element having a tip portion for generating a write field and a conductive assembly that delivers a write assist current through the tip portion to generate a write assist field.Type: ApplicationFiled: March 15, 2007Publication date: September 18, 2008Applicant: Seagate Technology LLCInventors: Chunhong Hou, Shaoping Li, John M. Wolf, Sining Mao
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Patent number: 7382574Abstract: A perpendicular writer includes a write coil and a main pole having a pole tip for conducting magnetic flux to write data to a magnetic medium. The pole tip includes a plurality of magnetic layers that are magnetically coupled and biased so that their magnetic moment orientations are substantially parallel to an external surface when no write current is applied to the write coil. The pole tip is partially embedded in the yoke, such that portions of the yoke surrounding the pole tip help direct magnetic flux to the pole tip. The pole tip extends beyond the yoke, with a first end located outside the yoke and a second end located within the yoke.Type: GrantFiled: December 6, 2004Date of Patent: June 3, 2008Assignee: Seagate Technology LLCInventors: Shaoping Li, Chunhong Hou, Lei Wang
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Publication number: 20070097546Abstract: A perpendicular writer includes a surface, a main pole proximate the surface, a return pole proximate the surface, and a back yoke connecting the main pole to the return pole distal the surface. The return pole is configured such that a magnetization of a portion of the return pole adjacent the surface is held substantially parallel to the surface during a write operation.Type: ApplicationFiled: October 28, 2005Publication date: May 3, 2007Applicant: Seagate Technology LLCInventors: Shaoping Li, Lei Wang, Chunhong Hou, Song Xue, Daniel Brown
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Publication number: 20070091675Abstract: The present invention provides a tunneling giant magnetoresistance (TGMR) sensor. The sensor including an active region. The active region having a first bias layer. The sensor also including a passive region. The passive region has an insulating layer and a second bias layer. Furthermore, the insulating layer is positioned between the active region and the second bias layer.Type: ApplicationFiled: October 20, 2005Publication date: April 26, 2007Applicant: Seagate Technology LLCInventors: Chunhong Hou, Qing He, Xuefei Tang
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Patent number: 7177122Abstract: A biasing system for a tri-layer reader stack magnetoresistive sensor is disclosed. The tri-layer reader stack includes a first ferromagnetic free layer, a second ferromagnetic free layer, and a magnetoresistive layer between the first and second ferromagnetic free layers. The free layers are positioned in the tri-layer reader stack such that quiescent state magnetizations of the free layers are antiparallel. A biasing layer is positioned with regard to the tri-layer reader stack, typically separated from the tri-layer reader stack by a nonmagnetic spacer layer. A biasing means is positioned such that a magnetization of the biasing layer is perpendicular to the quiescent state magnetizations of the free layers. This biasing results in the free layers having biased magnetizations directed substantially orthogonal with respect to each other.Type: GrantFiled: October 27, 2003Date of Patent: February 13, 2007Assignee: Seagate Technology LLCInventors: Chunhong Hou, Sining Mao, Eric S. Linville, Olle Heinonen, Xuefei Tang, Qing He, Eric W. Singleton, Song S. Xue
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Patent number: 7016166Abstract: A structure for stabilizing the active region of the magnetic sensor comprises a hard ferromagnetic element adjacent to a biasing multilayer element placed on either side of the active region of the magnetic sensor. The biasing multilayer element includes soft ferromagnetic and anti-ferromagnetic layers such that the biasing strength applied to the active region of the magnetic sensor is tuneable by adjusting the length of the soft ferromagnetic layer or layers as well as the insertion of spacer layers between the soft ferromagnetic materials and the anti-ferromagnetic layers. The inventive structure provides longitudinal bias to the active region with improved domain control, signal amplitude and side-reading properties.Type: GrantFiled: April 3, 2003Date of Patent: March 21, 2006Assignee: Seagate Technology LLCInventors: Chunhong Hou, Xuefei Tang, Qing He, Lei Wang
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Publication number: 20060034038Abstract: A panel generally designed for a user of a portable computing device to rest his wrists upon when using the portable computing device's integrated keyboard slides to reveal recessed keys contained inside the housing of the portable computing device. Upon opening, the panel will lock and thereby engage the recessed keys. In an alternate embodiment of the invention, the recessed keys extend above the case of the portable computing device when engaged. In an alternate embodiment of the invention, the panel rotates on a hinge one hundred eighty degrees.Type: ApplicationFiled: August 11, 2004Publication date: February 16, 2006Inventor: Chunhong Hou
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Publication number: 20050088789Abstract: A biasing system for a tri-layer reader stack magnetoresistive sensor is disclosed. The tri-layer reader stack includes a first ferromagnetic free layer, a second ferromagnetic free layer, and a magnetoresistive layer between the first and second ferromagnetic free layers. The free layers are positioned in the tri-layer reader stack such that quiescent state magnetizations of the free layers are antiparallel. A biasing layer is positioned with regard to the tri-layer reader stack, typically separated from the tri-layer reader stack by a nonmagnetic spacer layer. A biasing means is positioned such that a magnetization of the biasing layer is perpendicular to the quiescent state magnetizations of the free layers. This biasing results in the free layers having biased magnetizations directed substantially orthogonal with respect to each other.Type: ApplicationFiled: October 27, 2003Publication date: April 28, 2005Applicant: Seagate Technology LLCInventors: Chunhong Hou, Sining Mao, Eric Linville, Olle Heinonen, Xuefei Tang, Qing He, Eric Singleton, Song Xue
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Patent number: 6809909Abstract: A giant magnetoresistive stack for use in a magnetic read head has a plurality of layers including at least one ferromagnetic layer which contributes to a giant magnetoresistive signal, a doped ferromagnetic pinned layer and a doped ferromagnetic underlayer which do not contribute to a giant magnetoresistive signal. The dopant in the doped ferromagnetic pinned layer and underlayer reduces parasitic shunting current through the giant magnetoresistive stack by providing an increase in resistivity without a decrease in magnetization.Type: GrantFiled: January 30, 2002Date of Patent: October 26, 2004Assignee: Seagate Technology LLCInventors: Chunhong Hou, Olle G. Heinonen, Mark T. Kief
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Patent number: 6762915Abstract: A magnetoresistive stack for use in a magnetic read head has a plurality of layers including a ferromagnetic free layer, a ferromagnetic pinned layer, and an antiferromagnetic pinning layer. The pinned layer and pinning layer each have a greater number of structural grains than the free layer, which decreases a fluctuation of magnetization in the magnetoresistive stack without decreasing a spatial resolution of the magnetoresistive stack.Type: GrantFiled: January 25, 2002Date of Patent: July 13, 2004Assignee: Seagate Technology LLCInventors: Taras Grigoryevich Pokhil, Olle Gunnar Heinonen, Chunhong Hou
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Publication number: 20030206381Abstract: A giant magnetoresistive stack for use in a magnetic read head has a plurality of layers including at least one ferromagnetic layer which contributes to a giant magnetoresistive signal, and at least one doped ferromagnetic layer which does not contribute to a giant magnetoresistive signal. The dopant in the doped ferromagnetic layer reduces parasitic shunting current through the giant magnetoresistive stack by providing an increase in resistivity without a decrease in magnetization.Type: ApplicationFiled: January 30, 2002Publication date: November 6, 2003Applicant: Seagate Technology LLCInventors: Chunhong Hou, Olle G. Heinonen, Mark T. Kief
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Publication number: 20030043503Abstract: A magnetoresistive stack for use in a magnetic read head has a plurality of layers including a ferromagnetic free layer, a ferromagnetic pinned layer, and an antiferromagnetic pinning layer. The pinned layer and pinning layer each have a greater number of structural grains than the free layer, which decreases a fluctuation of magnetization in the magnetoresistive stack without decreasing a spatial resolution of the magnetoresistive stack.Type: ApplicationFiled: January 25, 2002Publication date: March 6, 2003Applicant: Seagate Technology LLCInventors: Taras Grigoryevich, Olle Gunnar, Chunhong Hou