Patents by Inventor Yunfei Ding
Yunfei Ding 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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SPINTRONIC DEVICE COMPRISING DUAL FGL AND DUAL SPL TO REDUCE PERPENDICULAR FIELD AT WRITING LOCATION
Publication number: 20240144963Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole, a hot seed layer, and a spintronic device disposed between the main pole and the hot seed layer. The spintronic device comprises two field generation layers (FGLs), two spin polarization layers (SPLs), and two spin kill layers. The second SPL of the spintronic device drives the second FGL. The spintronic device further comprises one or more optional thin negative beta material layers, such as layers comprising FeCr, disposed in contact with at least one of the spin kill layers. When electric current is applied, the spin kill layers and optional negative beta material layers eliminate or reduce any spin torque between the FGLs and the SPLs.Type: ApplicationFiled: July 25, 2023Publication date: May 2, 2024Applicant: Western Digital Technologies, Inc.Inventors: Muhammad ASIF BASHIR, Alexander GONCHAROV, Zhigang BAI, Masato SHIIMOTO, Yunfei DING -
Publication number: 20240144962Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole, a shield, and a spintronic device disposed between the main pole and the shield. The spintronic device comprises two field generation layers (FGLs), two spin polarization layers (SPLs), and two spin kill layers. The spintronic device further comprises one or more optional thin negative beta material layers, such as layers comprising FeCr, disposed in contact with at least one of the spin kill layers. When electric current is applied, the spin kill layers and optional negative beta material layers eliminate or reduce any spin torque between the FGLs and the SPLs.Type: ApplicationFiled: July 25, 2023Publication date: May 2, 2024Applicant: Western Digital Technologies, Inc.Inventors: Muhammad ASIF BASHIR, Alexander GONCHAROV, Zhigang BAI, Masato SHIIMOTO, Yunfei DING
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Publication number: 20240144964Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a first current flow in a cross-track direction through a trailing shield. In one or more embodiments, a second current flows in a cross-track direction around the main pole. The magnetic recording device comprises a main pole disposed between a trailing shield, a leading shield, and side shields. A trailing gap is disposed between the side shields and the trailing shield. A high moment seed layer is disposed between the main pole and the trailing shield. A first insulation layer is disposed within the trailing shield and directs the first current through the trailing shield, guided to the proximity of the main pole. A second insulation layer, disposed below the trailing shield, directs the second current through the trailing shield, or alternatively through the side shields and around the main pole.Type: ApplicationFiled: January 9, 2024Publication date: May 2, 2024Applicant: Western Digital Technologies, Inc.Inventors: Alexander GONCHAROV, Muhammad ASIF BASHIR, Petrus Antonius VAN DER HEIJDEN, Yunfei DING, Zhigang BAI, James Terrence OLSON
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Publication number: 20240112694Abstract: Aspects of the present disclosure generally relate to a magnetic recording head assembly that includes an external alternating current (AC) source. A magnetic recording head of the magnetic recording head assembly includes a conductive structure between a main pole and a trailing shield. The conductive structure includes a conductive layer, and the conductive layer is nonmagnetic. The magnetic recording head assembly also includes an external AC source to supply AC current that flows through the conductive structure. In one aspect, the conductive structure is between a coil structure and the trailing shield, and the external AC source is coupled to the coil structure. The conductive structure and the external AC source facilitate consistently providing an enhanced AC writing field to facilitate effective and reliable writing, high ADC, high SNR, and reduced jitter.Type: ApplicationFiled: December 14, 2023Publication date: April 4, 2024Applicant: Western Digital Technologies, Inc.Inventors: Muhammad ASIF BASHIR, Petrus Antonius VAN DER HEIJDEN, James Terrence OLSON, Alexander GONCHAROV, Zhigang BAI, Yunfei DING
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Publication number: 20240105217Abstract: Various illustrative aspects are directed to a data storage device comprising a storage medium and a head configured to access the storage medium. The head comprises a first write assist element and a second write assist element. Control circuitry for driving the head is configured to apply a first write assist current Im that is synchronized to a write data current Iw to the first write assist element; and to apply a second DC write assist current Imdc to the second write assist element.Type: ApplicationFiled: September 14, 2023Publication date: March 28, 2024Inventors: Joey M. Poss, Yunfei Ding, John T. Contreras
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Patent number: 11900971Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a first current flow in a cross-track direction through a trailing shield. In one or more embodiments, a second current flows in a cross-track direction around the main pole. The magnetic recording device comprises a main pole disposed between a trailing shield, a leading shield, and side shields. A trailing gap is disposed between the side shields and the trailing shield. A high moment seed layer is disposed between the main pole and the trailing shield. A first insulation layer is disposed within the trailing shield and directs the first current through the trailing shield, guided to the proximity of the main pole. A second insulation layer, disposed below the trailing shield, directs the second current through the trailing shield, or alternatively through the side shields and around the main pole.Type: GrantFiled: June 21, 2022Date of Patent: February 13, 2024Assignee: Western Digital Technologies, Inc.Inventors: Alexander Goncharov, Muhammad Asif Bashir, Petrus Antonius Van Der Heijden, Yunfei Ding, Zhigang Bai, James Terrence Olson
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Patent number: 11894026Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a first current flow in a cross-track direction through a trailing shield. In one or more embodiments, a second current flows in a cross-track direction around the main pole. The magnetic recording device comprises a main pole disposed between a trailing shield, a leading shield, and side shields. A trailing gap is disposed between the side shields and the trailing shield. A high moment seed layer is disposed between the main pole and the trailing shield. A first insulation layer is disposed within the trailing shield and directs the first current through the trailing shield, guided to the proximity of the main pole. A second insulation layer, disposed below the trailing shield, directs the second current through the trailing shield, or alternatively through the side shields and around the main pole.Type: GrantFiled: June 21, 2022Date of Patent: February 6, 2024Assignee: Western Digital Technologies, Inc.Inventors: Alexander Goncharov, Muhammad Asif Bashir, Petrus Antonius Van Der Heijden, Yunfei Ding, Zhigang Bai, James Terrence Olson
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Patent number: 11881237Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a current flow in a cross-track direction around a main pole. The magnetic recording device comprises a main pole disposed between a trailing shield, a leading shield, and side shields. A trailing gap is disposed between the main pole and the trailing shield. A hot seed layer is disposed between the trailing gap and the trailing shield. A first insulation layer is disposed between the hot seed layer and the trailing shield, where the first insulation layer contacts the side shields. A second insulation layer is disposed between the main pole and leading shield, where the second insulation layer contacts the side shields. The first and second insulation layers direct the current through the side shields and across the main pole in a cross-track direction.Type: GrantFiled: November 24, 2021Date of Patent: January 23, 2024Assignee: Western Digital Technologies, Inc.Inventors: Muhammad Asif Bashir, Edward Hin Pong Lee, Amanda Baer, Aron Pentek, Zhigang Bai, Yunfei Ding, James Terrence Olson, Alexander Goncharov, Petrus Antonius Van Der Heijden
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Patent number: 11869548Abstract: Aspects of the present disclosure generally relate to a magnetic recording head assembly that includes an external alternating current (AC) source. A magnetic recording head of the magnetic recording head assembly includes a conductive structure between a main pole and a trailing shield. The conductive structure includes a conductive layer, and the conductive layer is nonmagnetic. The magnetic recording head assembly also includes an external AC source to supply AC current that flows through the conductive structure. In one aspect, the conductive structure is between a coil structure and the trailing shield, and the external AC source is coupled to the coil structure. The conductive structure and the external AC source facilitate consistently providing an enhanced AC writing field to facilitate effective and reliable writing, high ADC, high SNR, and reduced jitter.Type: GrantFiled: February 23, 2021Date of Patent: January 9, 2024Assignee: Western Digital Technologies, Inc.Inventors: Muhammad Asif Bashir, Petrus Antonius Van Der Heijden, James Terrence Olson, Alexander Goncharov, Zhigang Bai, Yunfei Ding
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Patent number: 11776568Abstract: The present disclosure generally relates to improved lifetime of a data storage device utilizing an energy assist element. Rather than applying the same current to each energy assist element of a device, each energy assist element has a write current specific to the energy assist element. The unique applied current results in the corresponding energy assist elements having substantially the same temperature during operation. Obtaining substantially the same temperature during operation provides predictable and repeatable device performance and increases the lifetime of the entire data storage device as all energy assist elements should have substantially the same lifetime.Type: GrantFiled: February 22, 2022Date of Patent: October 3, 2023Assignee: Western Digital Technologies, Inc.Inventors: Yu Lo, Yan Liu, Timothy A. Riener, Feng Liu, Yunfei Ding, Yaw-Shing Tang, Karl A. Flechsig
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Publication number: 20230267954Abstract: The present disclosure generally relates to improved lifetime of a data storage device utilizing an energy assist element. Rather than applying the same current to each energy assist element of a device, each energy assist element has a write current specific to the energy assist element. The unique applied current results in the corresponding energy assist elements having substantially the same temperature during operation. Obtaining substantially the same temperature during operation provides predictable and repeatable device performance and increases the lifetime of the entire data storage device as all energy assist elements should have substantially the same lifetime.Type: ApplicationFiled: February 22, 2022Publication date: August 24, 2023Applicant: Western Digital Technologies, Inc.Inventors: Yu LO, Yan LIU, Timothy A. RIENER, Feng LIU, Yunfei DING, Yaw-Shing TANG, Karl A. FLECHSIG
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Patent number: 11508401Abstract: Aspects of the present disclosure generally relate to a magnetic recording head of a magnetic recording device that facilitates generating a downtrack magnetic bias field to enhance writing. During magnetic writing using the magnetic recording head, a bias current is directed in a cross-track direction on the trailing side of the main pole. Bias current flowing in the cross-track direction on a leading side of the main pole is reduced or eliminated. The bias current flowing in the cross-track direction on the trailing side of the main pole facilitates generating a magnetic field in a downtrack direction. The magnetic field in the downtrack direction is a bias field generated using the bias current. The magnetic bias field in the downtrack direction facilitates enhanced writing performance and increased areal density capability (ADC) for magnetic recording.Type: GrantFiled: February 23, 2021Date of Patent: November 22, 2022Assignee: Western Digital Technologies, Inc.Inventors: Muhammad Asif Bashir, Petrus Antonius Van Der Heijden, James Terrence Olson, Alexander Goncharov, Zhigang Bai, Yunfei Ding
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Patent number: 11276424Abstract: Disclosed herein is a data storage device comprising a slider comprising an embedded contact sensor, an electronics module, and a plurality of lines disposed between and coupled to the slider and the electronics module, wherein at least one line of the plurality of lines is configured to both (a) couple a slider bias voltage to a body of the slider to control a potential of the slider, and (b) provide a signal to the embedded contact sensor. The slider may also include a shunt circuit for mitigating radio-frequency interference by shunting it to ground. The slider may include a write element, which may include a write-field enhancement structure. The slider may include a read element for reading from a recording media.Type: GrantFiled: June 29, 2021Date of Patent: March 15, 2022Assignee: Western Digital Technologies, Inc.Inventors: John Contreras, Yunfei Ding, Kuok San Ho, Ian Robson McFadyen, Joey Martin Poss
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Publication number: 20210327462Abstract: Disclosed herein is a data storage device comprising a slider comprising an embedded contact sensor, an electronics module, and a plurality of lines disposed between and coupled to the slider and the electronics module, wherein at least one line of the plurality of lines is configured to both (a) couple a slider bias voltage to a body of the slider to control a potential of the slider, and (b) provide a signal to the embedded contact sensor. The slider may also include a shunt circuit for mitigating radio-frequency interference by shunting it to ground. The slider may include a write element, which may include a write-field enhancement structure. The slider may include a read element for reading from a recording media.Type: ApplicationFiled: June 29, 2021Publication date: October 21, 2021Applicant: Western Digital Technologies, Inc.Inventors: John Contreras, Yunfei Ding, Kuok San Ho, Ian Robson McFadyen, Joey Martin Poss
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Patent number: 11087784Abstract: Disclosed herein is a data storage device comprising a recording media, a slider comprising a write head having a write-field enhancement structure for recording data to the recording media, an electronics module, and a plurality of lines disposed between and coupled to the slider and the electronics module, wherein at least one line of the plurality of lines is configured to both couple a bias voltage to a body of the slider, and carry a bias current for the write-field enhancement structure. Also disclosed herein is a data storage device comprising a slider with an embedded contact sensor, an electronics module, and a plurality of lines disposed between and coupled to the slider and the electronics module, wherein at least one line of the plurality of lines is configured to both couple a bias voltage to a body of the slider, and provide a signal to the embedded contact sensor.Type: GrantFiled: March 30, 2020Date of Patent: August 10, 2021Assignee: Western Digital Technologies, Inc.Inventors: John Contreras, Yunfei Ding, Kuok San Ho, Ian Robson McFadyen, Joey Martin Poss
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Patent number: 11049514Abstract: The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The head includes a main pole at a media facing surface (MFS), a trailing shield at the MFS, and a MAMR stack disposed between the main pole and the trailing shield at the MFS. The MAMR stack includes a seed layer and at least one magnetic layer. The seed layer is fabricated from a thermally conductive material having electrical resistivity lower than that of the main pole. The seed layer has a stripe height greater than a stripe height of the at least one magnetic layer. With the extended seed layer, the bias current from the trailing shield to the main pole spreads further away from the MFS along the extended seed layer before flowing into the main pole, reducing temperature rise at or near the MAMR stack, leading to improved write head reliability.Type: GrantFiled: July 17, 2020Date of Patent: June 29, 2021Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Michael Kuok San Ho, Yunfei Ding, Zhigang Bai, Yaguang Wei, Terence Lam, Goncalo Marcos Baião De Albuquerque, Xinjiang Shen, Feng Q. Liu
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Patent number: 10957346Abstract: Disclosed herein are magnetic recording devices and methods of using them. A magnetic recording device comprises a main pole extending to an air-bearing surface (ABS), a trailing shield extending to the ABS, a write-field-enhancing structure disposed between and coupled to the main pole and the trailing shield at the ABS, a write coil configured to magnetize the main pole, a write current control circuit coupled to the write coil and configured to apply a write current to the write coil, wherein the write current comprises a write pulse, and a bias current control circuit coupled to the write-field-enhancing structure and configured to apply a bias current to the write-field-enhancing structure, wherein the bias current comprises a driving pulse offset in time from the write pulse by a delay, wherein the delay substantially coincides with an expected magnetization switch-time lag of a free layer of the write-field-enhancing structure.Type: GrantFiled: March 29, 2020Date of Patent: March 23, 2021Assignee: Western Digital Technologies, Inc.Inventors: Gonçalo Marcos Baião De Albuquerque, Yunfei Ding, Alexander Goncharov, Kuok San Ho, Daniele Mauri, Goran Mihajlovic, Suping Song, Petrus Antonius Van Der Heijden
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Patent number: 10891973Abstract: Disclosed herein are circuits, architectures, and methods that provide for the control of a data storage device write head's trailing shield and main pole potential with respect to the disk using circuitry that is integrated with circuitry used to bias a spin torque oscillator (STO) apparatus. Various embodiments include slider connections with STO bias circuitry that resides in a read/write integrated circuit, which has a programmable circuit that generates a bias current with overshoot (bias kicks). Also disclosed are circuits that may be incorporated into a slider to mitigate radio-frequency interference.Type: GrantFiled: March 11, 2020Date of Patent: January 12, 2021Assignee: Western Digital Technologies, Inc.Inventors: John Contreras, Yunfei Ding, Kuok San Ho, Ian Robson McFadyen, Joey Martin Poss
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Publication number: 20200349967Abstract: Disclosed herein are magnetic recording devices and methods of using them. A magnetic recording device comprises a main pole extending to an air-bearing surface (ABS), a trailing shield extending to the ABS, a write-field-enhancing structure disposed between and coupled to the main pole and the trailing shield at the ABS, a write coil configured to magnetize the main pole, a write current control circuit coupled to the write coil and configured to apply a write current to the write coil, wherein the write current comprises a write pulse, and a bias current control circuit coupled to the write-field-enhancing structure and configured to apply a bias current to the write-field-enhancing structure, wherein the bias current comprises a driving pulse offset in time from the write pulse by a delay, wherein the delay substantially coincides with an expected magnetization switch-time lag of a free layer of the write-field-enhancing structure.Type: ApplicationFiled: March 29, 2020Publication date: November 5, 2020Applicant: Western Digital Technologies, Inc.Inventors: Gonçalo Marcos Baião DE ALBUQUERQUE, Yunfei DING, Alexander GONCHAROV, Kuok San HO, Daniele MAURI, Goran MIHAJLOVIC, Suping SONG, Petrus Antonius VAN DER HEIJDEN
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Publication number: 20200349968Abstract: The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The head includes a main pole at a media facing surface (MFS), a trailing shield at the MFS, and a MAMR stack disposed between the main pole and the trailing shield at the MFS. The MAMR stack includes a seed layer and at least one magnetic layer. The seed layer is fabricated from a thermally conductive material having electrical resistivity lower than that of the main pole. The seed layer has a stripe height greater than a stripe height of the at least one magnetic layer. With the extended seed layer, the bias current from the trailing shield to the main pole spreads further away from the MFS along the extended seed layer before flowing into the main pole, reducing temperature rise at or near the MAMR stack, leading to improved write head reliability.Type: ApplicationFiled: July 17, 2020Publication date: November 5, 2020Inventors: Michael Kuok San HO, Yunfei DING, Zhigang BAI, Yaguang WEI, Terence LAM, Goncalo Marcos BAIÃO DE ALBUQUERQUE, Xinjiang SHEN, Feng Q. LIU