Patents by Inventor Dexin Wang
Dexin Wang 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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Publication number: 20110194335Abstract: A magnetic memory unit includes a tunneling barrier separating a free magnetic element and a reference magnetic element. A first phonon glass electron crystal layer is disposed on a side opposing the tunneling barrier of either the free magnetic element or the reference magnetic element. A second phonon glass electron crystal layer also be disposed on a side opposing the tunneling barrier of either the free magnetic element or the reference magnetic element to provide a Peltier effect on the free magnetic element and the reference magnetic element.Type: ApplicationFiled: April 19, 2011Publication date: August 11, 2011Applicant: SEAGATE TECHNOLOGY LLCInventors: Yuankai Zheng, Haiwen Xi, Dimitar V. Dimitrov, Dexin Wang
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Publication number: 20110188300Abstract: A method and apparatus for stray magnetic field compensation in a non-volatile memory cell, such as a spin-torque transfer random access memory (STRAM). In some embodiments, a first tunneling barrier is coupled to a reference structure that has a perpendicular anisotropy and a first magnetization direction. A recording structure that has a perpendicular anisotropy is coupled to the first tunneling barrier and a nonmagnetic spacer layer. A compensation layer that has a perpendicular anisotropy and a second magnetization direction in substantial opposition to the first magnetization direction is coupled to the nonmagnetic spacer layer. Further, the memory cell is programmable to a selected resistance state with application of a current to the recording structure.Type: ApplicationFiled: April 12, 2011Publication date: August 4, 2011Applicant: SEAGATE TECHNOLOGY LLCInventors: Dimitar V. Dimitrov, Olle Gunnar Heinonen, Dexin Wang, Haiwen Xi
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Publication number: 20110169177Abstract: A method and apparatus for humidifying residential and commercial buildings in which a flue gas generated by a residential or commercial furnace is provided to one side of a porous liquid water transport membrane and habitable space air is provided to an opposite side of the porous liquid water transport membrane in an amount sufficient to provide a habitable space air to flue gas volume flow rate ratio of at least 8.3:1. At least a portion of the water vapor in the flue gas is condensed, providing condensed liquid water which is passed through the porous liquid water transport membrane to the habitable space air side of the porous liquid water transport membrane. On the habitable space air side of the membrane, the condensed liquid water is evaporated into the habitable space air, producing humidified habitable space air which is provided to the rooms of the residential and commercial buildings. Beneficially, no supplemental water source is required for the humidification process.Type: ApplicationFiled: March 31, 2011Publication date: July 14, 2011Applicant: GAS TECHNOLOGY INSTITUTEInventors: Dexin Wang, William E. Liss, Richard A. Knight
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Patent number: 7972416Abstract: A method and apparatus for humidifying air in which the first side of a permselective water transport membrane is contacted with water vapor laden flue gas from a combustion process having a first water vapor partial pressure and a first temperature and at least a portion of the water vapor is condensed, producing condensed water. The condensed water is transported through the membrane to the opposite side of the membrane, which is contacted with an air stream having a second water vapor partial pressure, which second water vapor partial pressure is less than the first water vapor partial pressure, and having a second temperature, which second temperature is less than the first temperature. Upon contact with the air stream, the condensed water evaporates into the air stream, resulting in a humidified air stream.Type: GrantFiled: February 19, 2008Date of Patent: July 5, 2011Assignee: Gas Technology InstituteInventors: Dexin Wang, William E. Liss, Richard A. Knight
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Publication number: 20110134682Abstract: Variable write and read methods for resistance random access memory (RRAM) are disclosed. The methods include initializing a write sequence and verifying the resistance state of the RRAM cell. If a write pulse is needed, then two or more write pulses are applied through the RRAM cell to write the desired data state to the RRAM cell. Each subsequent write pulse has substantially the same or greater write pulse duration. Subsequent write pulses are applied to the RRAM cell until the RRAM cell is in the desired data state or until a predetermined number of write pulses have been applied to the RRAM cell. A read method is also disclosed where subsequent read pulses are applied through the RRAM cell until the read is successful or until a predetermined number of read pulses have been applied to the RRAM cell.Type: ApplicationFiled: February 16, 2011Publication date: June 9, 2011Applicant: SEAGATE TECHNOLOGY LLCInventors: Haiwen Xi, Hongyue Liu, Xiaobin Wang, Yong Lu, Yiran Chen, Yuankai Zheng, Dimitar V. Dimitrov, Dexin Wang, Hai Li
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Patent number: 7952917Abstract: Variable write and read methods for resistance random access memory (RRAM) are disclosed. The methods include initializing a write sequence and verifying the resistance state of the RRAM cell. If a write pulse is needed, then two or more write pulses are applied through the RRAM cell to write the desired data state to the RRAM cell. Each subsequent write pulse has substantially the same or greater write pulse duration. Subsequent write pulses are applied to the RRAM cell until the RRAM cell is in the desired data state or until a predetermined number of write pulses have been applied to the RRAM cell. A read method is also disclosed where subsequent read pulses are applied through the RRAM cell until the read is successful or until a predetermined number of read pulses have been applied to the RRAM cell.Type: GrantFiled: June 4, 2010Date of Patent: May 31, 2011Assignee: Seagate Technology LLCInventors: Haiwen Xi, Hongyue Liu, Xiaobin Wang, Yong Lu, Yiran Chen, Yuankai Zheng, Dimitar V. Dimitrov, Dexin Wang, Hai Li
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Patent number: 7940551Abstract: Spin-transfer torque memory having a specular insulative spacer is disclosed. The spin-transfer torque memory unit includes a free magnetic layer, a reference magnetic layer, an electrically insulating and non-magnetic tunneling barrier layer separating the free magnetic layer from the reference magnetic layer, an electrode layer, and an electrically insulating and electronically reflective layer separating the electrode layer and the free magnetic layer.Type: GrantFiled: September 29, 2008Date of Patent: May 10, 2011Assignee: Seagate Technology, LLCInventors: Yuankai Zheng, Dimitar V. Dimitrov, Wei Tian, Dexin Wang, Zheng Gao, Xiaobin Wang
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Patent number: 7940600Abstract: A method and apparatus for stray magnetic field compensation in a non-volatile memory cell, such as a spin-torque transfer random access memory (STRAM). In some embodiments, a first tunneling barrier is coupled to a reference structure that has a perpendicular anisotropy and a first magnetization direction. A recording structure that has a perpendicular anisotropy is coupled to the first tunneling barrier and a nonmagnetic spacer layer. A compensation layer that has a perpendicular anisotropy and a second magnetization direction in substantial opposition to the first magnetization direction is coupled to the nonmagnetic spacer layer. Further, the memory cell is programmable to a selected resistance state with application of a current to the recording structure.Type: GrantFiled: December 2, 2008Date of Patent: May 10, 2011Assignee: Seagate Technology LLCInventors: Dimitar Dimitrov, Olle Gunnar Heinonen, Dexin Wang, Haiwen Xi
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Patent number: 7909417Abstract: A braking control system and method for a vehicle improves vehicle stability and steerability. When a braking torque is being applied and a road disturbance is detected, the braking torque may be reduced as the vehicle traverses the road disturbance. Subsequently, when the road disturbance has been traversed, the braking control system may allow the application of braking torque as requested by a braking device. The reduction in braking torque when traversing road disturbances minimizes the physical impact experienced by the vehicle wheels.Type: GrantFiled: December 1, 2006Date of Patent: March 22, 2011Assignee: Ford Global Technologies, LLCInventors: Dexin Wang, Rena Basch, Yitzong Chern
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Publication number: 20110049658Abstract: Magnetic tunnel junctions having a specular insulative spacer are disclosed. The magnetic tunnel junction includes a free magnetic layer, a reference magnetic layer, an electrically insulating and non-magnetic tunneling barrier layer separating the free magnetic layer from the reference magnetic layer, and an electrically insulating and electronically reflective layer positioned to reflect at least a portion of electrons back into the free magnetic layer.Type: ApplicationFiled: November 11, 2010Publication date: March 3, 2011Applicant: SEAGATE TECHNOLOGY LLCInventors: Yuankai Zheng, Dimitar V. Dimitrov, Wei Tian, Dexin Wang, Zheng Gao, Xiaobin Wang
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Publication number: 20110019465Abstract: A magnetic tunnel junction having a compensation element is disclosed. The magnetic tunnel junction includes a synthetic antiferromagnetic reference element, and a synthetic antiferromagnetic compensation element having an opposite magnetization moment to a magnetization moment of the synthetic antiferromagnetic reference element. A free magnetic layer is between the synthetic antiferromagnetic reference element and the synthetic antiferromagnetic compensation element, and an electrically insulating and non-magnetic tunneling barrier layer separates the free magnetic layer from the synthetic antiferromagnetic reference element. The free magnetic layer includes Co100-X-YFeXBY wherein X is a value being greater than 30 and Y is a value being greater than 15.Type: ApplicationFiled: October 7, 2010Publication date: January 27, 2011Applicant: SEAGATE TECHNOLOGY LLCInventors: Yuankai Zheng, Dimitar V. Dimitrov, Dexin Wang, Wei Tian, Xiaobin Wang, Xiaohua Lou
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Patent number: 7826255Abstract: Variable write and read methods for resistance random access memory (RRAM) are disclosed. The methods include initializing a write sequence and verifying the resistance state of the RRAM cell. If a write pulse is needed, then two or more write pulses are applied through the RRAM cell to write the desired data state to the RRAM cell. Each subsequent write pulse has substantially the same or greater write pulse duration. Subsequent write pulses are applied to the RRAM cell until the RRAM cell is in the desired data state or until a predetermined number of write pulses have been applied to the RRAM cell. A read method is also disclosed where subsequent read pulses are applied through the RRAM cell until the read is successful or until a predetermined number of read pulses have been applied to the RRAM cell.Type: GrantFiled: September 15, 2008Date of Patent: November 2, 2010Assignee: Seagate Technology LLCInventors: Haiwen Xi, Hongyue Liu, Xiaobin Wang, Yong Lu, Yiran Chen, Yuankai Zheng, Dimitar V. Dimitrov, Dexin Wang, Hai Li
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Patent number: 7826256Abstract: Spin-transfer torque memory having a compensation element is disclosed. The spin-transfer torque memory unit includes a synthetic antiferromagnetic reference element, a synthetic antiferromagnetic compensation element, a free magnetic layer between the synthetic antiferromagnetic reference element and the synthetic antiferromagnetic compensation element, and an electrically insulating and non-magnetic tunneling barrier layer separating the free magnetic layer from the synthetic antiferromagnetic reference element. The free magnetic layer has a saturation moment value greater than 1100 emu/cc.Type: GrantFiled: September 29, 2008Date of Patent: November 2, 2010Assignee: Seagate Technology LLCInventors: Yuankai Zheng, Dimitar V. Dimitrov, Dexin Wang, Wei Tian, Xiaobin Wang, Xiaohua Lou
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Publication number: 20100268422Abstract: A system for decoupling steering rack force disturbances in electric steering may comprise a steering wheel angle sensor, a yaw rate sensor, a lateral acceleration sensor, and a steering torque sensor. The system may also comprise a tire force generator configured to receive signals from the steering wheel angle sensor, the yaw rate sensor, and the lateral acceleration sensor and send a reference rack force to a controller. The system may further comprise a rack force observer configured to receive signals from the steering torque sensor and send an estimated rack force to the controller, wherein the controller is configured to receive signals from the tire force generator and the rack force observer, compare the estimated rack force with the reference rack force to determine a rack force disturbance, and adjust an auxiliary torque based on the rack force disturbance.Type: ApplicationFiled: April 20, 2009Publication date: October 21, 2010Inventors: Michael Alan Blommer, Paul George Sanders, Hongtei Eric Tseng, Dexin Wang
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Publication number: 20100254174Abstract: A resistive sense memory and method of writing data thereto. In accordance with various embodiments, the resistive sense memory comprises a first reference layer with a fixed magnetic orientation in a selected direction coupled to a first tunneling barrier, a second reference layer with a fixed magnetic orientation in the selected direction coupled to a second tunneling barrier, and a recording structure disposed between the first and second tunneling barriers comprising first and second free layers. A selected logic state is written to the resistive sense memory by applying a programming input to impart complementary first and second programmed magnetic orientations to the respective first and second free layers.Type: ApplicationFiled: April 2, 2009Publication date: October 7, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Yuankai Zheng, Xiaohua Lou, Zheng Gao, Wei Tian, Dimitar V. Dimitrov, Dexin Wang
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Publication number: 20100246245Abstract: 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 7, 2010Publication date: September 30, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Haiwen Xi, Dexin Wang, Dimitar V. Dimitrov, Paul E. Anderson, Song S. Xue
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Publication number: 20100238712Abstract: Variable write and read methods for resistance random access memory (RRAM) are disclosed. The methods include initializing a write sequence and verifying the resistance state of the RRAM cell. If a write pulse is needed, then two or more write pulses are applied through the RRAM cell to write the desired data state to the RRAM cell. Each subsequent write pulse has substantially the same or greater write pulse duration. Subsequent write pulses are applied to the RRAM cell until the RRAM cell is in the desired data state or until a predetermined number of write pulses have been applied to the RRAM cell. A read method is also disclosed where subsequent read pulses are applied through the RRAM cell until the read is successful or until a predetermined number of read pulses have been applied to the RRAM cell.Type: ApplicationFiled: June 4, 2010Publication date: September 23, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Haiwen Xi, Hongyue Liu, Xiaobin Wang, Yong Lu, Yiran Chen, Yuankai Zheng, Dimitar V. Dimitrov, Dexin Wang, Hai Li
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Publication number: 20100220512Abstract: Various embodiments of the present invention are generally directed to an apparatus comprising a programmable power source which uses an array of resistive sense memory cells, such as but not limited to STRAM or RRAM cells, to provide a controlled power bias to a load, such as but not limited to a micro-oscillator. In some embodiments, the programmable power source incorporates an array of serially connected resistive sense memory cells. A selectively controllable power level is applied by the programmable power source to a load in relation to a control input which selectively programs at least selected ones of the memory cells to a selected resistance state.Type: ApplicationFiled: March 2, 2009Publication date: September 2, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Yiran Chen, Insik Jin, Hai Li, Dimitar V. Dimitrov, Dexin Wang
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Publication number: 20100193758Abstract: Programmable metallization memory cells having a planarized silver electrode and methods of forming the same are disclosed. The programmable metallization memory cells include a first metal contact and a second metal contact, an ion conductor solid electrolyte material is between the first metal contact and the second metal contact, and either a silver alloy doping electrode separates the ion conductor solid electrolyte material from the first metal contact or the second metal contact, or a silver doping electrode separates the ion conductor solid electrolyte material from the first metal contact. The silver electrode includes a silver layer and a metal seed layer separating the silver layer from the first metal contact.Type: ApplicationFiled: January 30, 2009Publication date: August 5, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Wei Tian, Dexin Wang, Venugopalan Vaithyanathan, Yang Dong, Muralikrishnan Balakrishnan, Ivan Petrov Ivanov, Ming Sun, Dimitar V. Dimitrov
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Publication number: 20100197104Abstract: Methods for making a programmable metallization memory cell are disclosed.Type: ApplicationFiled: April 16, 2010Publication date: August 5, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Haiwen Xi, Ming Sun, Dexin Wang, Shuiyuan Huang, Michael Tang, Song S. Xue