Patents by Inventor Wonjoon Jung
Wonjoon Jung 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: 8963264Abstract: Various embodiments may configure a magnetic stack with a magnetically free layer, a reference structure, and a biasing layer. The magnetically free layer and reference structure can each be respectively configured with first and second magnetizations aligned along a first plane while the biasing layer has a third magnetization aligned along a second plane, substantially perpendicular to the first plane.Type: GrantFiled: June 29, 2012Date of Patent: February 24, 2015Assignee: Seagate Technology LLCInventors: Dimitar Velikov Dimitrov, Wonjoon Jung
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Publication number: 20140268428Abstract: A data storage device may be generally directed to a data transducing head capable of magnetoresistive data reading. Such a data transducing head may be configured with at least a trilayer reader that contacts and is biased by a coupling feature. The coupling feature may have a smaller extent from an air bearing surface (ABS) than the trilayer reader.Type: ApplicationFiled: March 12, 2013Publication date: September 18, 2014Applicant: SEAGATE TECHNOLOGY LLCInventors: Dimitar Velikov Dimitrov, Dian Song, Wonjoon Jung, Mark William Covington, Mark Thomas Kief
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Patent number: 8755154Abstract: Various embodiments may be constructed with a trilayer stack that is positioned on an air bearing surface (ABS). The trilayer stack can be configured with a stripe height along an axis orthogonal to the ABS and with first and second magnetic free layers that each has an angled uniaxial anisotropy with respect to the ABS.Type: GrantFiled: September 13, 2011Date of Patent: June 17, 2014Assignee: Seagate Technology LLCInventors: Dimitar Velikov Dimitrov, Mark William Covington, Wonjoon Jung
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Publication number: 20140146419Abstract: A magnetic element may be configured with at least a magnetic stack having first and second magnetically free layers that each has a predetermined stripe height from an air bearing surface (ABS). The first and second magnetically free layers can respectively be configured with first and second uniaxial anisotropies that are crossed in relation to the ABS and angled in response to the predetermined stripe height.Type: ApplicationFiled: November 28, 2012Publication date: May 29, 2014Applicant: SEAGATE TECHNOLOGY LLCInventors: Mark William Covington, Victor Boris Sapozhnikov, Wonjoon Jung, Dimitar Velikov Demitrov, Dian Song, Taras Pohkil
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Patent number: 8670271Abstract: A magnetic tunnel junction having a ferromagnetic free layer and a ferromagnetic pinned reference layer, each having an out-of-plane magnetic anisotropy and an out-of-plane magnetization orientation, the ferromagnetic free layer switchable by spin torque. The magnetic tunnel junction includes a ferromagnetic assist layer proximate the free layer, the assist layer having a low magnetic anisotropy less than 700 Oe and positioned to apply a magnetic field on the free layer.Type: GrantFiled: April 5, 2013Date of Patent: March 11, 2014Assignee: Seagate Technology LLCInventors: Yuankai Zheng, Zheng Gao, Wonjoon Jung, Xuebing Feng, Xiaohua Lou, Haiwen Xi
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Publication number: 20140001585Abstract: Various embodiments may configure a magnetic stack with a magnetically free layer, a reference structure, and a biasing layer. The magnetically free layer and reference structure can each be respectively configured with first and second magnetizations aligned along a first plane while the biasing layer has a third magnetization aligned along a second plane, substantially perpendicular to the first plane.Type: ApplicationFiled: June 29, 2012Publication date: January 2, 2014Applicant: SEAGATE TECHNOLOGY LLCInventors: Dimitar Velikov Dimitrov, Wonjoon Jung
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Patent number: 8553369Abstract: A magnetic element capable of detecting changes in magnetic states, such as for use as a read sensor in a data transducing head or as a solid-state non-volatile memory element. In accordance with various embodiments, the magnetic element includes a magnetically responsive stack or lamination with a first areal extent. The stack includes a spacer layer positioned between first and second ferromagnetic free layers. At least one antiferromagnetic (AFM) tab is connected to the first free layer on a surface thereof opposite the spacer layer, the AFM tab having a second areal extent that is less than the first areal extent.Type: GrantFiled: November 30, 2010Date of Patent: October 8, 2013Assignee: Seagate Technology LLCInventors: Dion Song, Mark William Covington, Qing He, Dimitar Velikov Dimitrov, Wei Tian, Wonjoon Jung, Sunita Bhardwaj Gangopadhyay
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Publication number: 20130244192Abstract: A magnetic sensor comprising a first shield and a second shield and a sensor stack between the first and the second shield, the sensor stack having a plurality of layers wherein at least one layer is annealed using in-situ rapid thermal annealing. In one implementation of the magnetic sensor a seed layer is annealed using in-situ rapid thermal annealing. Alternatively, one of a barrier layer, an AFM layer, and a cap layer is annealed using in-situ rapid thermal annealing.Type: ApplicationFiled: March 14, 2012Publication date: September 19, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Qing He, Wonjoon Jung, Mark William Covington, Mark Thomas Kief, Yonghua Chen
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Publication number: 20130228884Abstract: A magnetic tunnel junction having a ferromagnetic free layer and a ferromagnetic pinned reference layer, each having an out-of-plane magnetic anisotropy and an out-of-plane magnetization orientation, the ferromagnetic free layer switchable by spin torque. The magnetic tunnel junction includes a ferromagnetic assist layer proximate the free layer, the assist layer having a low magnetic anisotropy less than 700 Oe and positioned to apply a magnetic field on the free layer.Type: ApplicationFiled: April 5, 2013Publication date: September 5, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Yuankai Zheng, Zheng Gao, Wonjoon Jung, Xuebing Feng, Xiaohue Lou, Haiwen Xi
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Patent number: 8519498Abstract: A magnetic cell includes a ferromagnetic free layer having a free magnetization orientation direction and a first ferromagnetic pinned reference layer having a first reference magnetization orientation direction that is parallel or anti-parallel to the free magnetization orientation direction. A first oxide barrier layer is between the ferromagnetic free layer and the first ferromagnetic pinned reference layer. The magnetic cell further includes a second ferromagnetic pinned reference layer having a second reference magnetization orientation direction that is orthogonal to the first reference magnetization orientation direction. The ferromagnetic free layer is between the first ferromagnetic pinned reference layer and the second ferromagnetic pinned reference layer.Type: GrantFiled: September 13, 2012Date of Patent: August 27, 2013Assignee: Seagate Technology LLCInventors: Yuankai Zheng, Zheng Gao, Wenzhong Zhu, Wonjoon Jung, Haiwen Xi
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Patent number: 8503135Abstract: Various embodiments of the present invention are generally directed to a magnetically responsive lamination that may be constructed with a spacer layer disposed between a first and second ferromagnetic free layer. At least one ferromagnetic free layer can have a coupling sub-layer that enhances magnetoresistance ratio (MR) of the magnetically responsive lamination.Type: GrantFiled: September 21, 2011Date of Patent: August 6, 2013Assignee: Seagate Technology LLCInventors: Mark William Covington, Qing He, Wonjoon Jung, Vladyslav Alexandrovich Vas'ko
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Patent number: 8482883Abstract: A tunneling magneto-resistive reader includes a sensor stack separating a top magnetic shield from a bottom magnetic shield. The sensor stack includes a reference magnetic element having a reference magnetization orientation direction and a free magnetic element having a free magnetization orientation direction substantially perpendicular to the reference magnetization orientation direction. A non-magnetic spacer layer separates the reference magnetic element from the free magnetic element. A first side magnetic shield and a second side magnetic shield is disposed between the top magnetic shield from a bottom magnetic shield, and the sensor stack is between the first side magnetic shield and the second side magnetic shield. The first side magnetic shield and the second side magnetic shield electrically insulates the top magnetic shield from a bottom magnetic shield.Type: GrantFiled: January 20, 2012Date of Patent: July 9, 2013Assignee: Seagate Technology LLCInventors: Dimitar V. Dimitrov, Zheng Gao, Wonjoon Jung, Paul Edward Anderson, Olle Gunnar Heinonen
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Patent number: 8467154Abstract: Disclosed herein are magnetic sensors that include: a sensor stack having a front and an opposing back, wherein the front of the sensor stack defines an air bearing surface of the magnetic sensor, and the sensor stack includes: a free layer assembly having a second magnetization direction, that is substantially perpendicular to a plane of each layer of the sensor stack; and a stabilizing structure positioned away from the air bearing surface at the back of the sensor stack.Type: GrantFiled: August 31, 2011Date of Patent: June 18, 2013Assignee: Seagate Technology LLCInventors: Mark William Covington, Dimitar Velikov Dimitrov, Wonjoon Jung, Dion Song
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Patent number: 8416620Abstract: A magnetic tunnel junction having a ferromagnetic free layer and a ferromagnetic pinned reference layer, each having an out-of-plane magnetic anisotropy and an out-of-plane magnetization orientation, the ferromagnetic free layer switchable by spin torque. The magnetic tunnel junction includes a ferromagnetic assist layer proximate the free layer, the assist layer having a low magnetic anisotropy less than 700 Oe and positioned to apply a magnetic field on the free layer.Type: GrantFiled: November 11, 2010Date of Patent: April 9, 2013Assignee: Seagate Technology LLCInventors: Yuankai Zheng, Zheng Gao, Wonjoon Jung, Xuebing Feng, Xiaohua Lou, Haiwen Xi
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Publication number: 20130071692Abstract: Various embodiments may be generally directed to a magnetic sensor constructed with a decoupling layer that has a predetermined first morphology. A magnetic free layer can be deposited contactingly adjacent to the decoupling layer with the magnetic free layer configured to have at least a first sub-layer having a predetermined second morphology.Type: ApplicationFiled: September 21, 2011Publication date: March 21, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Mark William Covington, Mark Thomas Kief, Wonjoon Jung
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Publication number: 20130071691Abstract: Various embodiments of the present invention are generally directed to a magnetically responsive lamination that may be constructed with a spacer layer disposed between a first and second ferromagnetic free layer. At least one ferromagnetic free layer can have a coupling sub-layer that enhances magnetoresistance ratio (MR) of the magnetically responsive lamination.Type: ApplicationFiled: September 21, 2011Publication date: March 21, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Mark William Covington, Qing He, Wonjoon Jung, Vladyslav Alexandrovich Vas'ko
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Publication number: 20130065085Abstract: Various embodiments may be constructed with a trilayer stack that is positioned on an air bearing surface (ABS). The trilayer stack can be configured with a stripe height along an axis orthogonal to the ABS and with first and second magnetic free layers that each has an angled uniaxial anisotropy with respect to the ABS.Type: ApplicationFiled: September 13, 2011Publication date: March 14, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Dimitar Velikov Dimitrov, Mark William Covington, Wonjoon Jung
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Patent number: 8395867Abstract: A magnetic sensor has at least a free sub-stack, a reference sub-stack and a front shield. The free sub-stack has a magnetization direction substantially perpendicular to the planar orientation of the layer and extends to an air bearing surface. The reference sub-stack has a magnetization direction substantially perpendicular to the magnetization direction of the free sub-stack. The reference sub-stack is recessed from the air bearing surface and a front shield is positioned between the reference sub-stack and the air bearing surface.Type: GrantFiled: March 16, 2009Date of Patent: March 12, 2013Inventors: Dimitar Velikov Dimitrov, Zheng Gao, Wonjoon Jung, Sharat Batra, Olle Gunnar Heinonen
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Publication number: 20130050876Abstract: Disclosed herein are magnetic sensors that include: a sensor stack having a front and an opposing back, wherein the front of the sensor stack defines an air bearing surface of the magnetic sensor, and the sensor stack includes: a free layer assembly having a second magnetization direction, that is substantially perpendicular to a plane of each layer of the sensor stack; and a stabilizing structure positioned away from the air bearing surface at the back of the sensor stack.Type: ApplicationFiled: August 31, 2011Publication date: February 28, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Mark William Covington, Dimitar Velikov Dimitrov, Wonjoon Jung, Dion Song
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Publication number: 20130021697Abstract: A tunneling magneto-resistive reader includes a sensor stack separating a top magnetic shield from a bottom magnetic shield. The sensor stack includes a reference magnetic element having a reference magnetization orientation direction and a free magnetic element having a free magnetization orientation direction substantially perpendicular to the reference magnetization orientation direction. A non-magnetic spacer layer separates the reference magnetic element from the free magnetic element. A first side magnetic shield and a second side magnetic shield is disposed between the top magnetic shield from a bottom magnetic shield, and the sensor stack is between the first side magnetic shield and the second side magnetic shield. The first side magnetic shield and the second side magnetic shield electrically insulates the top magnetic shield from a bottom magnetic shield.Type: ApplicationFiled: January 20, 2012Publication date: January 24, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Dimitar V. Dimitrov, Zheng Gao, Wonjoon Jung, Paul Edward Anderson, Olle Gunnar Heinonen