Patents by Inventor Alexander M. Zeltser
Alexander M. Zeltser 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: 11682418Abstract: The present disclosure generally relates to data storage devices, and more specifically, 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 heavy metal layer disposed between the main pole and the trailing shield at the MFS. Spin-orbit torque (SOT) is generated from the heavy metal layer and transferred to a surface of the main pole as a current passes through the heavy metal layer in a cross-track direction. The SOT executes a torque on the surface magnetization of the main pole, which reduces the magnetic flux shunting from the main pole to the trailing shield. With the reduced magnetic flux shunting from the main pole to the trailing shield, write-ability is improved.Type: GrantFiled: July 19, 2022Date of Patent: June 20, 2023Assignee: Western Digital Technologies, Inc.Inventors: Suping Song, Zhanjie Li, Michael Kuok San Ho, Quang Le, Alexander M. Zeltser
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Publication number: 20220358957Abstract: The present disclosure generally relates to data storage devices, and more specifically, 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 heavy metal layer disposed between the main pole and the trailing shield at the MFS. Spin-orbit torque (SOT) is generated from the heavy metal layer and transferred to a surface of the main pole as a current passes through the heavy metal layer in a cross-track direction. The SOT executes a torque on the surface magnetization of the main pole, which reduces the magnetic flux shunting from the main pole to the trailing shield. With the reduced magnetic flux shunting from the main pole to the trailing shield, write-ability is improved.Type: ApplicationFiled: July 19, 2022Publication date: November 10, 2022Applicant: Western Digital Technologies, Inc.Inventors: Suping SONG, Zhanjie LI, Kuok San HO, Quang LE, Alexander M. ZELTSER
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Patent number: 11437058Abstract: The present disclosure generally relates to data storage devices, and more specifically, 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 heavy metal layer disposed between the main pole and the trailing shield at the MFS. Spin-orbit torque (SOT) is generated from the heavy metal layer and transferred to a surface of the main pole as a current passes through the heavy metal layer in a cross-track direction. The SOT executes a torque on the surface magnetization of the main pole, which reduces the magnetic flux shunting from the main pole to the trailing shield. With the reduced magnetic flux shunting from the main pole to the trailing shield, write-ability is improved.Type: GrantFiled: May 25, 2021Date of Patent: September 6, 2022Assignee: Western Digital Technologies, Inc.Inventors: Suping Song, Zhanjie Li, Michael Kuok San Ho, Quang Le, Alexander M. Zeltser
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Patent number: 11199594Abstract: Embodiments of the present disclosure generally relate to a large field range TMR sensor of magnetic tunnel junctions (MTJs) with a free layer having an intrinsic anisotropy. In one embodiment, a tunnel magnetoresistive (TMR) based magnetic sensor in a Wheatstone configuration includes at least one MTJ. The MTJ includes a free layer having an intrinsic anisotropy produced by deposition at a high oblique angle from normal. Magnetic domain formations within the free layer can be further controlled by a pinned layer canted at an angle to the intrinsic anisotropy of the free layer, by a hard bias element, by shape anisotropy, or combinations thereof.Type: GrantFiled: December 27, 2019Date of Patent: December 14, 2021Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Daniele Mauri, Alexander M. Zeltser, Goncalo Baiao De Albuquerque, Yuankai Zheng, Christian Kaiser
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Publication number: 20210280208Abstract: The present disclosure generally relates to data storage devices, and more specifically, 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 heavy metal layer disposed between the main pole and the trailing shield at the MFS. Spin-orbit torque (SOT) is generated from the heavy metal layer and transferred to a surface of the main pole as a current passes through the heavy metal layer in a cross-track direction. The SOT executes a torque on the surface magnetization of the main pole, which reduces the magnetic flux shunting from the main pole to the trailing shield. With the reduced magnetic flux shunting from the main pole to the trailing shield, write-ability is improved.Type: ApplicationFiled: May 25, 2021Publication date: September 9, 2021Applicant: Western Digital Technologies, Inc.Inventors: Suping SONG, Zhanjie LI, Michael Kuok San HO, Quang LE, Alexander M. ZELTSER
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Patent number: 11049512Abstract: The present disclosure generally relates to data storage devices, and more specifically, 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 heavy metal layer disposed between the main pole and the trailing shield at the MFS. Spin-orbit torque (SOT) is generated from the heavy metal layer and transferred to a surface of the main pole as a current passes through the heavy metal layer in a cross-track direction. The SOT executes a torque on the surface magnetization of the main pole, which reduces the magnetic flux shunting from the main pole to the trailing shield. With the reduced magnetic flux shunting from the main pole to the trailing shield, write-ability is improved.Type: GrantFiled: June 25, 2020Date of Patent: June 29, 2021Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Suping Song, Zhanjie Li, Michael Kuok San Ho, Quang Le, Alexander M. Zeltser
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Publication number: 20210063500Abstract: Embodiments of the present disclosure generally relate to a large field range TMR sensor of magnetic tunnel junctions (MTJs) with a free layer having an intrinsic anisotropy. In one embodiment, a tunnel magnetoresistive (TMR) based magnetic sensor in a Wheatstone configuration includes at least one MTJ. The MTJ includes a free layer having an intrinsic anisotropy produced by deposition at a high oblique angle from normal. Magnetic domain formations within the free layer can be further controlled by a pinned layer canted at an angle to the intrinsic anisotropy of the free layer, by a hard bias element, by shape anisotropy, or combinations thereof.Type: ApplicationFiled: December 27, 2019Publication date: March 4, 2021Inventors: Daniele MAURI, Alexander M. ZELTSER, Goncalo BAIAO DE ALBUQUERQUE, Yuankai ZHENG, Christian KAISER
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Patent number: 10891976Abstract: The present disclosure generally relates to data storage devices, and more specifically, 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 heavy metal layer disposed between the main pole and the trailing shield at the MFS. Spin-orbit torque (SOT) is generated from the heavy metal layer and transferred to a surface of the main pole as a current passes through the heavy metal layer in a cross-track direction. The SOT executes a torque on the surface magnetization of the main pole, which reduces the magnetic flux shunting from the main pole to the trailing shield. With the reduced magnetic flux shunting from the main pole to the trailing shield, write-ability is improved.Type: GrantFiled: February 27, 2020Date of Patent: January 12, 2021Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Suping Song, Zhanjie Li, Kuok San Ho, Quang Le, Alexander M. Zeltser
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Publication number: 20200327899Abstract: The present disclosure generally relates to data storage devices, and more specifically, 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 heavy metal layer disposed between the main pole and the trailing shield at the MFS. Spin-orbit torque (SOT) is generated from the heavy metal layer and transferred to a surface of the main pole as a current passes through the heavy metal layer in a cross-track direction. The SOT executes a torque on the surface magnetization of the main pole, which reduces the magnetic flux shunting from the main pole to the trailing shield. With the reduced magnetic flux shunting from the main pole to the trailing shield, write-ability is improved.Type: ApplicationFiled: June 25, 2020Publication date: October 15, 2020Inventors: Suping SONG, Zhanjie LI, Michael Kuok San HO, Quang LE, Alexander M. ZELTSER
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Patent number: 10762918Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a trailing shield, a main pole, a MAMR stack disposed between the trailing shield and the main pole, side shields surrounding at least a portion of the main pole, and a structure disposed between the side shields and the main pole at a media facing surface (MFS). The structure is fabricated from a material that is thermally conductive and electrically insulating/dissipative. The material has a thermal conductivity of at least 50 W/(m*K) and an electrical resistivity of at least 105 ?*m. The structure helps dissipate joule heating generated from either the main pole or the MAMR stack into surrounding area without electrical shunting, leading to reduced heating or break-down induced failures.Type: GrantFiled: March 24, 2020Date of Patent: September 1, 2020Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Quang Le, Hongquan Jiang, Ning Shi, Alexander M. Zeltser
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Patent number: 10734014Abstract: The present disclosure generally relates to data storage devices, and more specifically, 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 heavy metal layer disposed between the main pole and the trailing shield at the MFS. Spin-orbit torque (SOT) is generated from the heavy metal layer and transferred to a surface of the main pole as a current passes through the heavy metal layer in a cross-track direction. The SOT executes a torque on the surface magnetization of the main pole, which reduces the magnetic flux shunting from the main pole to the trailing shield. With the reduced magnetic flux shunting from the main pole to the trailing shield, write-ability is improved.Type: GrantFiled: June 14, 2018Date of Patent: August 4, 2020Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Suping Song, Zhanjie Li, Michael Kuok San Ho, Quang Le, Alexander M. Zeltser
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Publication number: 20200227075Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a trailing shield, a main pole, a MAMR stack disposed between the trailing shield and the main pole, side shields surrounding at least a portion of the main pole, and a structure disposed between the side shields and the main pole at a media facing surface (MFS). The structure is fabricated from a material that is thermally conductive and electrically insulating/dissipative. The material has a thermal conductivity of at least 50 W/(m*K) and an electrical resistivity of at least 105 ?*m. The structure helps dissipate joule heating generated from either the main pole or the MAMR stack into surrounding area without electrical shunting, leading to reduced heating or break-down induced failures.Type: ApplicationFiled: March 24, 2020Publication date: July 16, 2020Inventors: Quang LE, Hongquan JIANG, Ning SHI, Alexander M. ZELTSER
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Patent number: 10636439Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a trailing shield, a main pole, a MAMR stack disposed between the trailing shield and the main pole, side shields surrounding at least a portion of the main pole, and a structure disposed between the side shields and the main pole at a media facing surface (WS). The structure is fabricated from a material that is thermally conductive and electrically insulating/dissipative. The material has a thermal conductivity of at least 50 W/(m*K) and an electrical resistivity of at least 105 ?*m. The structure helps dissipate joule heating generated from either the main pole or the MAMR stack into surrounding area without electrical shunting, leading to reduced heating or break-down induced failures.Type: GrantFiled: February 14, 2019Date of Patent: April 28, 2020Assignee: Western Digital Technologies, Inc.Inventors: Quang Le, Hongquan Jiang, Ning Shi, Alexander M. Zeltser
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Publication number: 20190279663Abstract: The present disclosure generally relates to data storage devices, and more specifically, 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 heavy metal layer disposed between the main pole and the trailing shield at the MFS. Spin-orbit torque (SOT) is generated from the heavy metal layer and transferred to a surface of the main pole as a current passes through the heavy metal layer in a cross-track direction. The SOT executes a torque on the surface magnetization of the main pole, which reduces the magnetic flux shunting from the main pole to the trailing shield. With the reduced magnetic flux shunting from the main pole to the trailing shield, write-ability is improved.Type: ApplicationFiled: June 14, 2018Publication date: September 12, 2019Inventors: Suping SONG, Zhanjie LI, Michael Kuok San HO, Quang LE, Alexander M. ZELTSER
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Publication number: 20190259413Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a trailing shield, a main pole, a MAMR stack disposed between the trailing shield and the main pole, side shields surrounding at least a portion of the main pole, and a structure disposed between the side shields and the main pole at a media facing surface (WS). The structure is fabricated from a material that is thermally conductive and electrically insulating/dissipative. The material has a thermal conductivity of at least 50 W/(m*K) and an electrical resistivity of at least 105 ?*m. The structure helps dissipate joule heating generated from either the main pole or the MAMR stack into surrounding area without electrical shunting, leading to reduced heating or break-down induced failures.Type: ApplicationFiled: February 14, 2019Publication date: August 22, 2019Applicant: Western Digital Technologies, Inc.Inventors: Quang LE, Hongquan JIANG, Ning SHI, Alexander M. ZELTSER
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Patent number: 10311901Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic read head. The magnetic read head includes an antiferromagnetic layer recessed from the MFS, a reference layer disposed over the antiferromagnetic layer, a free layer disposed over the reference layer, and a thermally conductive structure disposed over the reference layer. The thermally conductive structure is recessed from the MFS. The thermally conductive structure includes a first portion and a second portion. The first portion of the thermally conductive structure extends from the second portion of the thermally conductive structure towards the MFS. The first portion of the thermally conductive structure is aligned with the free layer in a stripe height direction. With the thermally conductive structure, thermal stabilization of the read head is achieved.Type: GrantFiled: May 30, 2018Date of Patent: June 4, 2019Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Quang Le, Hongquan Jiang, Yongchul Ahn, Alexander M. Zeltser
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Patent number: 10157632Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a main pole, a heavy metal structure surrounding at least a portion of the main pole at a media facing surface (MFS), and two magnetic structures sandwiching the heavy metal structure. Spin-orbit torque (SOT) is generated from the heavy metal structure, inducing magnetization switching (or precession) in the magnetic structures. The SOT reduces the magnetic flux shunting from the main pole to the trailing shield, and the magnetization switching sharpens the write field profile in the cross-track direction. The SOT based head with the magnetic structures sandwiching the heavy metal structure increases both track density (tracks per inch) and linear density (bit per inch), which in turn increases the areal density capability (ADC), which is the product of tracks per inch and bit per inch.Type: GrantFiled: June 23, 2017Date of Patent: December 18, 2018Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Suping Song, Zhanjie Li, Michael Kuok San Ho, Quang Le, Alexander M. Zeltser
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Publication number: 20150380017Abstract: The embodiments of the present invention relate to a magnetic write head and a method for forming the magnetic write head. The magnetic write head includes a partially laminated main pole that has a magnetic layer that is recessed from a media facing surface, a nonmagnetic spacer layer disposed on and adjacent to the magnetic layer and a laminated stack disposed on at least a portion of the nonmagnetic layer. The nonmagnetic spacer layer has a first end at the media facing surface and a second end at a distance from the media facing surface and the laminated stack has a first end at the media facing surface and as second end at a distance from the media facing surface.Type: ApplicationFiled: September 4, 2015Publication date: December 31, 2015Inventors: Venkatesh CHEMBROLU, Wen-Chien David HSIAO, Alexander M. ZELTSER
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Patent number: 9129619Abstract: The embodiments of the present invention relate to a magnetic write head and a method for forming the magnetic write head. The magnetic write head includes a partially laminated main pole that has a magnetic layer that is recessed from a media facing surface, a nonmagnetic spacer layer disposed on and adjacent to the magnetic layer and a laminated stack disposed on at least a portion of the nonmagnetic layer. The nonmagnetic spacer layer has a first end at the media facing surface and a second end at a distance from the media facing surface and the laminated stack has a first end at the media facing surface and as second end at a distance from the media facing surface.Type: GrantFiled: January 27, 2014Date of Patent: September 8, 2015Assignee: HGST NETHERLANDS B.V.Inventors: Venkatesh Chembrolu, Wen-Chien David Hsiao, Alexander M. Zeltser
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Publication number: 20150213814Abstract: The embodiments of the present invention relate to a magnetic write head and a method for forming the magnetic write head. The magnetic write head includes a partially laminated main pole that has a magnetic layer that is recessed from a media facing surface, a nonmagnetic spacer layer disposed on and adjacent to the magnetic layer and a laminated stack disposed on at least a portion of the nonmagnetic layer. The nonmagnetic spacer layer has a first end at the media facing surface and a second end at a distance from the media facing surface and the laminated stack has a first end at the media facing surface and as second end at a distance from the media facing surface.Type: ApplicationFiled: January 27, 2014Publication date: July 30, 2015Applicant: HGST NETHERLANDS B.V.Inventors: Venkatesh CHEMBROLU, Wen-Chien David HSIAO, Alexander M. ZELTSER