Patents by Inventor Song S. Xue
Song S. Xue 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: 10054649Abstract: A magnetic sensor assembly includes first and second shields each comprised of a magnetic material. The first and second shields define a physical shield-to-shield spacing. A sensor stack is disposed between the first and second shields and includes a seed layer adjacent the first shield, a cap layer adjacent the second shield, and a magnetic sensor between the seed layer and the cap layer. At least a portion of the seed layer and/or the cap layer comprises a magnetic material to provide an effective shield-to-shield spacing of the magnetic sensor assembly that is less than the physical shield-to-shield spacing.Type: GrantFiled: August 16, 2016Date of Patent: August 21, 2018Assignee: Seagate Technology LLCInventors: Eric W. Singleton, Qing He, Jae-Young Yi, Matt Johnson, Zheng Gao, Dimitar V. Dimitrov, Song S. Xue
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Publication number: 20160356861Abstract: A magnetic sensor assembly includes first and second shields each comprised of a magnetic material. The first and second shields define a physical shield-to-shield spacing. A sensor stack is disposed between the first and second shields and includes a seed layer adjacent the first shield, a cap :layer adjacent the second shield, and a magnetic sensor between the seed layer and the cap layer. At least a portion of the seed layer and/or the cap layer comprises a magnetic material to provide an effective shield-to-shield spacing of the magnetic sensor assembly that is less than the physical shield-to-shield spacing.Type: ApplicationFiled: August 16, 2016Publication date: December 8, 2016Inventors: Eric W. Singleton, Qing He, Jae-Young Yi, Matt Johnson, Zheng Gao, Dimitar V. Dimitrov, Song S. Xue
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Patent number: 9442171Abstract: A magnetic sensor assembly includes first and second shields each comprised of a magnetic material. The first and second shields define a physical shield-to-shield spacing. A sensor stack is disposed between the first and second shields and includes a seed layer adjacent the first shield, a cap layer adjacent the second shield, and a magnetic sensor between the seed layer and the cap layer. At least a portion of the seed layer and/or the cap layer comprises a magnetic material to provide an effective shield-to-shield spacing of the magnetic sensor assembly that is less than the physical shield-to-shield spacing.Type: GrantFiled: January 9, 2008Date of Patent: September 13, 2016Assignee: SEAGATE TECHNOLOGY LLCInventors: Eric W. Singleton, Qing He, Jae-Young Yi, Matt Johnson, Zheng Gao, Dimitar V. Dimitrov, Song S. Xue
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Patent number: 8766382Abstract: A free ferromagnetic data storage layer of an MRAM cell is coupled to a free ferromagnetic stabilization layer, which stabilization layer is directly electrically coupled to a contact electrode, on one side, and is separated from the free ferromagnetic data storage layer, on an opposite side, by a spacer layer. The spacer layer provides for the coupling between the two free layers, which coupling is one of: a ferromagnetic coupling and an antiferromagnetic coupling.Type: GrantFiled: January 27, 2011Date of Patent: July 1, 2014Assignee: Seagate Technology LLCInventors: Haiwen Xi, Kaizhong Gao, Dimitar V. Dimitrov, Song S. Xue
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Patent number: 8766230Abstract: Non-volatile multi-bit memory with programmable capacitance is disclosed. Illustrative data memory units include a substrate including a source region and a drain region; and a gate stack structure over the substrate and between the source region and drain region. The gate stack structure includes a first solid electrolyte cell and a second solid electrolyte cell. The solid electrolyte cells having a capacitance that is controllable between at least two states. A gate contact layer is electrically coupled to a voltage source. The first solid electrolyte cell and the second solid electrolyte cell separate the gate contact layer from the substrate.Type: GrantFiled: August 17, 2010Date of Patent: July 1, 2014Assignee: Seagate Technology LLCInventors: Xuguang Wang, Shuiyuan Huang, Dimitar V. Dimitrov, Michael Xuefei Tang, Song S. Xue
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Patent number: 8711608Abstract: A memory unit includes a giant magnetoresistance cell electrically coupled between a write bit line and a write source line. The giant magnetoresistance cell includes a free magnetic layer. A magnetic tunnel junction data cell is electrically coupled between a read bit line and a read source line. The magnetic tunnel junction data cell includes the free magnetic layer. A write current passes through the giant magnetoresistance cell to switch the giant magnetoresistance cell between a high resistance state and a low resistance state. The magnetic tunnel junction data cell is configured to switch between a high resistance state and a low resistance state by magnetostatic coupling with the giant magnetoresistance cell, and be read by a read current passing though the magnetic tunnel junction data cell.Type: GrantFiled: March 5, 2013Date of Patent: April 29, 2014Assignee: Seagate Technology LLCInventors: Haiwen Xi, Hongyue Liu, Michael Xuefei Tang, Antoine Khoueir, Song S. Xue
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Patent number: 8659939Abstract: Spin torque magnetic memory elements that have a pinned layer, two free layers, and a current-blocking insulating layer proximate to at least one of the free layers. The resistive state (e.g., low resistance or high resistance) of the memory elements is altered by passing electric current through the element in one direction. In other words, to change from a low resistance to a high resistance, the direction of electric current is the same as to change from a high resistance to a low resistance. The elements have a unidirectional write scheme.Type: GrantFiled: June 22, 2012Date of Patent: February 25, 2014Assignee: Seagate Technology LLCInventors: Haiwen Xi, Dexin Wang, Dimitar V. Dimitrov, Paul E. Anderson, Song S. Xue
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Patent number: 8659852Abstract: A magnetic junction memory array and methods of using the same are described. The magnetic junction memory array includes a plurality of electrically conductive word lines extending in a first direction, a plurality of electrically conductive bit lines extending in a second direction and forming a cross-point array with the plurality of electrically conductive word lines, and a memory cell proximate to, at least selected, cross-points forming a magnetic junction memory array. Each memory cell includes a magnetic pinned layer electrically between a magnetic bit and an isolation transistor. The isolation transistor has a current source and a gate. The current source is electrically coupled to the cross-point bit line and the gate is electrically coupled to the cross-point word line. An electrically conductive cover layer is disposed on and in electrical communication with the magnetic bits.Type: GrantFiled: April 21, 2008Date of Patent: February 25, 2014Assignee: Seagate Technology LLCInventors: Haiwen Xi, Song S. Xue
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Patent number: 8599600Abstract: Write verify methods for resistance random access memory (RRAM) are provided. The methods include applying a reset operation voltage pulse across a RRAM cell to change a resistance of the RRAM cell from a low resistance state to a high resistance state and applying a forward resetting voltage pulse across the RRAM cell if the RRAM cell has a high resistance state resistance value less than a selected lower resistance limit value. The method also includes applying a reverse resetting voltage pulse across the RRAM cell if the RRAM cell has a high resistance state resistance values is greater than a selected upper resistance limit value. The reverse resetting voltage pulse has a second polarity being opposite the first polarity.Type: GrantFiled: October 21, 2011Date of Patent: December 3, 2013Assignee: Seagate Technology LLCInventors: Haiwen Xi, Song S. Xue
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Patent number: 8514605Abstract: A memory unit includes a magnetic tunnel junction data cell is electrically coupled to a bit line and a source line. The magnetic tunnel junction data cell is configured to switch between a high resistance state and a low resistance state by passing a write current through the magnetic tunnel junction data cell. A first diode is electrically between the magnetic tunnel junction data cell and the source line and a second diode is electrically between the magnetic tunnel junction data cell and the source line. The first diode and second diode are in parallel electrical connection, and having opposing forward bias directions. The memory unit is configured to be precharged to a specified precharge voltage level and the precharge voltage is less than a threshold voltage of the first diode and second diode.Type: GrantFiled: September 12, 2012Date of Patent: August 20, 2013Assignee: Seagate Technology LLCInventors: Yiran Chen, Hai Li, Hongyue Liu, Yong Lu, Song S. Xue
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Patent number: 8476721Abstract: A transistor device includes a magnetic field source adapted to deflect a flow of free electron carriers within a channel of the device, between a source region and a drain region thereof. According to preferred configurations, the magnetic field source includes a magnetic material layer extending over a side of the channel that is opposite a gate electrode of the transistor device.Type: GrantFiled: April 18, 2011Date of Patent: July 2, 2013Assignee: Seagate Technology LLCInventors: Yang Li, Insik Jin, Harry Liu, Song S. Xue, Shuiyuan Huang, Michael X. Tang
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Patent number: 8440330Abstract: Magnetic tunnel junction cells and methods of making magnetic tunnel junction cells that include a radially protective layer extending proximate at least the ferromagnetic free layer of the cell. The radially protective layer can be specifically chosen in thickness, deposition method, material composition, and/or extent along the cell layers to enhance the effective magnetic properties of the free layer, including the effective coercivity, effective magnetic anisotropy, effective dispersion in magnetic moment, or effective spin polarization.Type: GrantFiled: October 21, 2011Date of Patent: May 14, 2013Assignee: Seagate Technology, LLCInventors: Paul E. Anderson, Song S. Xue
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Patent number: 8422278Abstract: A memory unit includes a giant magnetoresistance cell electrically coupled between a write bit line and a write source line. The giant magnetoresistance cell includes a free magnetic layer separated from a first pinned magnetic layer by a first non-magnetic electrically conducting layer. A magnetic tunnel junction data cell is electrically coupled between a read bit line and a read source line. The magnetic tunnel junction data cell includes the free magnetic layer separated from a second pinned magnetic layer by an oxide barrier layer. A write current passes through the giant magnetoresistance cell to switche the giant magnetoresistance cell between a high resistance state and a low resistance state. The magnetic tunnel junction data cell is configured to switch between a high resistance state and a low resistance state by magnetostatic coupling with the giant magnetoresistance cell, and be read by a read current passing though the magnetic tunnel junction data cell.Type: GrantFiled: December 21, 2010Date of Patent: April 16, 2013Assignee: Seagate Technology LLCInventors: Haiwen Xi, Hongyue Liu, Michael Xuefei Tang, Antoine Khoueir, Song S. Xue
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Patent number: 8399908Abstract: Methods for making a programmable metallization memory cell are disclosed.Type: GrantFiled: January 11, 2012Date of Patent: March 19, 2013Assignee: Seagate Technology LLCInventors: Haiwen Xi, Ming Sun, Dexin Wang, Shuiyuan Huang, Michael Tang, Song S. Xue
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Patent number: 8400823Abstract: A memory unit includes a giant magnetoresistance cell electrically coupled between a write bit line and a write source line. The giant magnetoresistance cell includes a free magnetic layer separated from a first pinned magnetic layer by a first non-magnetic electrically conducting layer. A magnetic tunnel junction data cell is electrically coupled between a read bit line and a read source line. The magnetic tunnel junction data cell includes the free magnetic layer separated from a second pinned magnetic layer by an oxide barrier layer. A write current passes through the giant magnetoresistance cell to switch the giant magnetoresistance cell between a high resistance state and a low resistance state. The magnetic tunnel junction data cell is configured to switch between a high resistance state and a low resistance state by magnetostatic coupling with the giant magnetoresistance cell, and be read by a read current passing though the magnetic tunnel junction data cell.Type: GrantFiled: May 5, 2010Date of Patent: March 19, 2013Assignee: Seagate Technology LLCInventors: Haiwen Xi, Hongyue Liu, Michael Xuefei Tang, Antoine Khoueir, Song S. Xue
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Publication number: 20130003448Abstract: A memory unit includes a magnetic tunnel junction data cell is electrically coupled to a bit line and a source line. The magnetic tunnel junction data cell is configured to switch between a high resistance state and a low resistance state by passing a write current through the magnetic tunnel junction data cell. A first diode is electrically between the magnetic tunnel junction data cell and the source line and a second diode is electrically between the magnetic tunnel junction data cell and the source line. The first diode and second diode are in parallel electrical connection, and having opposing forward bias directions. The memory unit is configured to be precharged to a specified precharge voltage level and the precharge voltage is less than a threshold voltage of the first diode and second diode.Type: ApplicationFiled: September 12, 2012Publication date: January 3, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Yiran Chen, Hai Li, Hongyue Liu, Yong Lu, Song S. Xue
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Patent number: 8334165Abstract: Methods for making a programmable metallization memory cell are disclosed.Type: GrantFiled: April 16, 2010Date of Patent: December 18, 2012Assignee: Seagate Technology LLCInventors: Haiwen Xi, Ming Sun, Dexin Wang, Shuiyuan Huang, Michael Tang, Song S. Xue
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Patent number: 8335058Abstract: A magnetic sensor includes a reference layer having a first magnetization direction and a free layer assembly having an effective magnetization direction substantially perpendicular to the first magnetization direction and substantially perpendicular to a plane of each layer of the free layer assembly. A spacer layer is between the reference layer and the free layer, and a signal enhancement layer is exchange coupled to the free layer assembly on a side opposite the spacer layer.Type: GrantFiled: March 15, 2011Date of Patent: December 18, 2012Assignee: Seagate Technology LLCInventors: Song S. Xue, Zheng Gao, Shaoping Li, Kaizhong Gao, Dimitar V. Dimitrov, Konstantin Nikolaev, Patrick J. Ryan
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Patent number: 8296620Abstract: A method of utilizing at least one block of data, wherein the at least one block of data includes a plurality of cells for storing data and at least one error flag bit, the method including: scanning the block of data for errors; determining the error rate of the block of data; and applying an error correction code to data being read from or written to a cell within the at least one block of data, wherein the error correction code is applied based on the error rate, wherein a weak error correction code is applied when the error rate is below an error threshold, and a strong error correction code is applied when the error rate is at or above the error threshold.Type: GrantFiled: August 26, 2008Date of Patent: October 23, 2012Assignee: Seagate Technology LLCInventors: Yiran Chen, Hai Li, Hongyue Liu, Yong Lu, Song S. Xue
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Publication number: 20120261778Abstract: Spin torque magnetic memory elements that have a pinned layer, two free layers, and a current-blocking insulating layer proximate to at least one of the free layers. The resistive state (e.g., low resistance or high resistance) of the memory elements is altered by passing electric current through the element in one direction. In other words, to change from a low resistance to a high resistance, the direction of electric current is the same as to change from a high resistance to a low resistance. The elements have a unidirectional write scheme.Type: ApplicationFiled: June 22, 2012Publication date: October 18, 2012Applicant: SEAGATE TECHNOLOGY LLCInventors: Haiwen Xi, Dexin Wang, Dimitar V. Dimitrov, Paul E. Anderson, Song S. Xue