Patents by Inventor Guanxiong Li
Guanxiong Li 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).
-
Publication number: 20240094140Abstract: An on-line detection system for defects of an MEA is provided. The detection system includes a workbench, two connecting rods are arranged inside the workbench, two ends of the two connecting rods are both connected to two side walls of the workbench by means of bearings, and conveying rollers are fixedly arranged outside the two connecting rods in a sleeving manner. One side of the workbench is fixedly provided with a first electric motor, and an output end of the first electric motor is fixedly connected to one of the connecting rods. Belt pulleys are fixedly arranged outside the two connecting rods in a sleeving manner, and a belt is arranged outside the two belt pulleys in a sleeving manner. A hollow roller is arranged on an inner side of the workbench, and a plurality of exhaust holes are provided in a top of the hollow roller.Type: ApplicationFiled: August 18, 2023Publication date: March 21, 2024Applicant: China University of Petroleum (East China)Inventors: Min WANG, Jiexin ZOU, Mingbo WU, Han HU, Zhongtao LI, Debin KONG, Guanxiong WANG
-
Patent number: 11410690Abstract: The present disclosure generally related to a two dimensional magnetic recording (TDMR) read head having a magnetic tunnel junction (MTJ). Both the upper reader and the lower reader have a dual free layer (DFL) MTJ structure between two shields. A synthetic antiferromagnetic (SAF) soft bias structure bounds the MTJ, and a rear hard bias (RHB) structure is disposed behind the MTJ. The DFL MTJ decreases the distance between the upper and lower reader and hence, improves the area density capacity (ADC). Additionally, the SAF soft bias structures and the rear head bias structure cause the dual free layer MTJ to have a scissor state magnetic moment at the media facing surface (MFS).Type: GrantFiled: June 11, 2020Date of Patent: August 9, 2022Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Chih-Ching Hu, Yung-Hung Wang, Ming Mao, Guanxiong Li, Daniele Mauri, Xiaoyong Liu, Yukimasa Okada, Anup Roy, Chen-Jung Chien, Hongxue Liu
-
Publication number: 20210390978Abstract: The present disclosure generally related to a two dimensional magnetic recording (TDMR) read head having a magnetic tunnel junction (MTJ). Both the upper reader and the lower reader have a dual free layer (DFL) MTJ structure between two shields. A synthetic antiferromagnetic (SAF) soft bias structure bounds the MTJ, and a rear hard bias (RHB) structure is disposed behind the MTJ. The DFL MTJ decreases the distance between the upper and lower reader and hence, improves the area density capacity (ADC). Additionally, the SAF soft bias structures and the rear head bias structure cause the dual free layer MTJ to have a scissor state magnetic moment at the media facing surface (MFS).Type: ApplicationFiled: June 11, 2020Publication date: December 16, 2021Inventors: Chih-Ching HU, Yung-Hung WANG, Ming MAO, Guanxiong LI, Daniele MAURI, Xiaoyong LIU, Yukimasa OKADA, Anup ROY, Chen-jung CHIEN, Hongxue LIU
-
Patent number: 11087785Abstract: The present disclosure generally related to read heads having dual free layer (DFL) sensors. The read head has a sensor disposed between two shields. The sensor is a DFL sensor and has a surface at the media facing surface (MFS). Behind the DFL sensor, and away from the MFS, is a rear hard bias (RHB) structure. The RHB structure is disposed between the shields as well. In between the DFL sensor and the RHB structure is insulating material. The RHB is disposed on the insulating material. The RHB includes a RHB seed layer as well as a RHB bulk layer. The RHB seed layer has a thickness of between 26 Angstroms and 35 Angstroms. The RHB seed layer ensures the read head has a strong RHB magnetic field that can be uniformly applied.Type: GrantFiled: June 29, 2020Date of Patent: August 10, 2021Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Ming Mao, Daniele Mauri, Chen-Jung Chien, Guanxiong Li
-
Patent number: 10777222Abstract: A hybrid read head structure for two-dimensional magnetic recording (TDMR) in a disk drive has two stacked current-perpendicular-to-the plane magnetoresistive (CPP-MR) read heads or sensors substantially aligned with one another in the along-the track direction to enable both sensors to read data from the same data track. The structure is a hybrid structure formed on the disk drive slider with the lower sensor being a dual free layer (DFL) or scissoring type of CPP-MR sensor and the upper sensor being a single free layer (SFL) type of CPP-MR sensor.Type: GrantFiled: February 14, 2020Date of Patent: September 15, 2020Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Xiaoyong Liu, Chih-Ching Hu, Daniele Mauri, Ming Mao, Guanxiong Li, Yukimasa Okada, Ying Hong
-
Patent number: 10629230Abstract: A method of forming a magnetic head includes forming a read sensor stripe, depositing an electronic lapping guide (ELG) layer over the substrate in an ELG region, forming a backside edge of a read sensor by patterning the read sensor stripe in a first patterning step, forming a backside insulator layer and a rear bias magnetic material portion over the backside edge of the read sensor, forming a backside edge of an ELG by patterning the ELG layer in the ELG region in a second patterning step, simultaneously forming a front side edge of the read sensor and a front side edge of the ELG, and lapping the read sensor and the ELG to provide an air bearing surface of a read sensor. The physical stripe height offset can be determined for each flash field by correlating device conductance and ELG conductance.Type: GrantFiled: April 20, 2017Date of Patent: April 21, 2020Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Guanxiong Li, Ming Mao, Rong Cao, Chen-Jung Chien
-
Publication number: 20180308514Abstract: A method of forming a magnetic head includes forming a read sensor stripe, depositing an electronic lapping guide (ELG) layer over the substrate in an ELG region, forming a backside edge of a read sensor by patterning the read sensor stripe in a first patterning step, forming a backside insulator layer and a rear bias magnetic material portion over the backside edge of the read sensor, forming a backside edge of an ELG by patterning the ELG layer in the ELG region in a second patterning step, simultaneously forming a front side edge of the read sensor and a front side edge of the ELG, and lapping the read sensor and the ELG to provide an air bearing surface of a read sensor. The physical stripe height offset can be determined for each flash field by correlating device conductance and ELG conductance.Type: ApplicationFiled: April 20, 2017Publication date: October 25, 2018Inventors: Guanxiong LI, Ming MAO, Rong CAO, Chen-Jung CHIEN
-
Patent number: 9812155Abstract: A method provides a magnetic read apparatus. A sensor stack is deposited. The read sensor is defined from the stack such that the sensor has sides forming a junction angle of 75 degrees-105 degrees from a sensor bottom. Defining the sensor includes performing a first ion mill at a first angle and a first energy and performing a second ion mill at a second angle greater than the first angle and at a second energy less than the first energy. The first angle is 5 degrees-30 degrees from normal to the top surface. After the first ion mill, less than half of the stack's bottom layer depth remains unmilled. Magnetic bias structure(s) adjacent to the sides may be formed. The magnetic bias structure(s) include a side shielding material having at least one of the saturation magnetization greater than 800 emu/cm3 and an exchange length less than five nanometers.Type: GrantFiled: November 23, 2015Date of Patent: November 7, 2017Assignee: WESTERN DIGITAL (FREMONT), LLCInventors: Anup Ghosh Roy, Guanxiong Li, Daniele Mauri, Ming Mao, Goncalo Albuquerque, Savas Gider
-
Publication number: 20160329064Abstract: Disclosed are methods for making ultra-narrow track width (TW) read sensors, and read transducers incorporating such sensors. The methods utilize side-wall line patterning techniques to prepare ultra-narrow mill masks that can be used to prepare the ultra-narrow read sensors.Type: ApplicationFiled: June 29, 2016Publication date: November 10, 2016Inventors: MIAO WANG, WEI GAO, XIAOYU YANG, ANUP G. ROY, WEI ZHANG, WENCHENG SU, ZHIHONG ZHANG, JAMES YUAN, GUANXIONG LI, MING MAO, HAI SUN, LINGYUN MIAO
-
Publication number: 20160284989Abstract: Systems and methods for controlling a thickness of a soft bias layer in a tunnel magnetoresistance (TMR) reader are provided. One such method involves providing a magnetoresistive sensor stack including a free layer and a bottom shield layer, performing contiguous junction milling on the sensor stack, depositing an insulating layer on the sensor stack, depositing a spacer layer on the insulating layer, performing an angled milling sub-process to remove preselected portions of the spacer layer, depositing a soft bias layer on the sensor stack, and depositing a top shield layer on the sensor stack and the soft bias layer. The method can further involve adjusting an alignment of a top surface of the spacer layer with respect to the free layer. In one such case, the top surface of the spacer layer is adjust to be below the free layer.Type: ApplicationFiled: June 10, 2016Publication date: September 29, 2016Inventors: YI ZHENG, MING JIANG, ANUP G. ROY, GUANXIONG LI, MING MAO, DANIELE MAURI
-
Patent number: 9431040Abstract: A magnetic recording transducer comprises a magnetoresistive sensor having a left side, a right side opposite to the left side, a left junction angle at the left side, a right junction angle at the right side, and a track width. The right junction angle and the left junction angle are characterized by a junction angle difference of not more than six degrees. The track width is less than one hundred nanometers. The magnetic recording transducer further comprises a left hard bias structure residing adjacent to the left side of the magnetoresistive sensor, and a right hard bias structure residing adjacent to the right side of the magnetoresistive sensor.Type: GrantFiled: June 28, 2012Date of Patent: August 30, 2016Assignee: Western Digital (Fremont), LLCInventors: Guanxiong Li, Wei Zhang, Ming Mao
-
Patent number: 9412400Abstract: A tunnel magnetoresistance (TMR) read sensor having a tabbed AFM layer and an extended pinned layer and methods for making the same are provided. The TMR read sensor has an AFM layer recessed from the air bearing surface, providing a reduced shield-to-shield distance.Type: GrantFiled: June 15, 2015Date of Patent: August 9, 2016Assignee: Western Digital (Fremont), LLCInventors: Rongfu Xiao, Guanxiong Li, Zhihong Zhang, Ming Mao, Chen-Jung Chien
-
Patent number: 9406331Abstract: Disclosed are methods for making ultra-narrow track width (TW) read sensors, and read transducers incorporating such sensors. The methods utilize side-wall line patterning techniques to prepare ultra-narrow mill masks that can be used to prepare the ultra-narrow read sensors.Type: GrantFiled: June 27, 2013Date of Patent: August 2, 2016Assignee: Western Digital (Fremont), LLCInventors: Miao Wang, Wei Gao, Xiaoyu Yang, Anup G. Roy, Wei Zhang, Wencheng Su, Zhihong Zhang, James Yuan, Guanxiong Li, Ming Mao, Hai Sun, Lingyun Miao
-
Patent number: 9396743Abstract: Systems and methods for controlling a thickness of a soft bias layer in a tunnel magnetoresistance (TMR) reader are provided. One such method involves providing a magnetoresistive sensor stack including a free layer and a bottom shield layer, performing contiguous junction milling on the sensor stack, depositing an insulating layer on the sensor stack, depositing a spacer layer on the insulating layer, performing an angled milling sub-process to remove preselected portions of the spacer layer, depositing a soft bias layer on the sensor stack, and depositing a top shield layer on the sensor stack and the soft bias layer. The method can further involve adjusting an alignment of a top surface of the spacer layer with respect to the free layer. In one such case, the top surface of the spacer layer is adjusted to be below the free layer.Type: GrantFiled: June 18, 2014Date of Patent: July 19, 2016Assignee: Western Digital (Fremont), LLCInventors: Yi Zheng, Ming Jiang, Anup G. Roy, Guanxiong Li, Ming Mao, Daniele Mauri
-
Publication number: 20150279393Abstract: A tunnel magnetoresistance (TMR) read sensor having a tabbed AFM layer and an extended pinned layer and methods for making the same are provided. The TMR read sensor has an AFM layer recessed from the air bearing surface, providing a reduced shield-to-shield distance.Type: ApplicationFiled: June 15, 2015Publication date: October 1, 2015Inventors: RONGFU XIAO, GUANXIONG LI, ZHIHONG ZHANG, MING MAO, CHEN-JUNG CHIEN
-
Patent number: 9065043Abstract: A tunnel magnetoresistance (TMR) read sensor having a tabbed AFM layer and an extended pinned layer and methods for making the same are provided. The TMR read sensor has an AFM layer recessed from the air bearing surface, providing a reduced shield-to-shield distance.Type: GrantFiled: April 1, 2014Date of Patent: June 23, 2015Assignee: Western Digital (Fremont), LLCInventors: Rongfu Xiao, Guanxiong Li, Zhihong Zhang, Ming Mao, Chen-Jung Chien
-
Patent number: 9042058Abstract: A method and system provide a magnetic transducer having an air-bearing surface (ABS). The method provides a first read sensor stack and defines a first read sensor in a stripe height direction from the first read sensor stack. The stripe height direction is perpendicular to the ABS. A shield is provided on the first read sensor stack and in a down track direction from the first read sensor stack. A second read sensor stack is provided. The shield is between the first read sensor and the second read sensor stack in the down track direction. Both the first read sensor and the second read sensor are defined from the first read sensor stack and from the second read sensor stack, respectively, in a cross-track direction. The cross-track direction is substantially perpendicular to the down track direction and substantially perpendicular to the stripe height direction.Type: GrantFiled: December 4, 2013Date of Patent: May 26, 2015Assignee: Western Digital Technologies, Inc.Inventors: Shaoping Li, Gerardo A. Bertero, Michael L. Mallary, Guanxiong Li
-
Patent number: 9030784Abstract: A magnetic head including a magnetoresistive junction and an oxide layer. The magnetoresistive junction includes a pinned layer, a free layer, and a barrier layer residing between the pinned and free layer. The magnetoresistive junction includes at least one side having a smooth profile. The oxide layer is on the at least one side. The oxide layer is less than one nanometer thick at the free layer.Type: GrantFiled: March 21, 2013Date of Patent: May 12, 2015Assignee: Western Digital (Fremont), LLCInventors: Guanxiong Li, Xiaozhong Dang, Mahendra Pakala, Yong Shen
-
Patent number: 8883017Abstract: A method and system provide a substantially seamless interface in a magnetic transducer. The magnetic recording transducer includes a first layer and a second layer on the first layer. The second layer is different from the first layer. The first layer consists of at least one material. The method includes removing at least the second layer using a first removal process. A residue of the second layer and a first portion of the first layer remain after the first removal process. A first sacrificial layer consists of the at least one material on the first portion of the first layer. At least the first sacrificial layer is removed using a second removal process. A second portion of the first layer remains after completion of the second removal process. An additional structure is provided. The seamless interface is between the second portion of the first layer and the additional structure.Type: GrantFiled: March 12, 2013Date of Patent: November 11, 2014Assignee: Western Digital (Fremont), LLCInventors: Zhihong Zhang, Guanxiong Li, Ming Mao
-
Patent number: 8760822Abstract: A method and system provide a magnetic transducer having an air-bearing surface (ABS). The magnetic transducer includes a first shield, a read sensor, at least one soft magnetic bias structure and a second shield. The read sensor includes a sensor layer, a pinned layer and edge(s). The sensor layer has a first stripe height in a stripe height direction perpendicular to the ABS. The pinned layer has a second stripe height in the stripe height direction. The second stripe height is greater than the first stripe height. The soft magnetic bias structure(s) are adjacent to the edge(s) of the sensor. A portion of the soft magnetic bias structure(s) is further from the ABS than the first stripe height. The read sensor is between the first shield and the second shield. The soft magnetic bias structure(s) extend to the second shield.Type: GrantFiled: November 28, 2012Date of Patent: June 24, 2014Assignee: Western Digital (Fremont), LLCInventors: Guanxiong Li, Ming Mao, Chih-Ching Hu