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).

  • Patent number: 8963264
    Abstract: 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: Grant
    Filed: June 29, 2012
    Date of Patent: February 24, 2015
    Assignee: Seagate Technology LLC
    Inventors: Dimitar Velikov Dimitrov, Wonjoon Jung
  • Publication number: 20140268428
    Abstract: 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: Application
    Filed: March 12, 2013
    Publication date: September 18, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Dimitar Velikov Dimitrov, Dian Song, Wonjoon Jung, Mark William Covington, Mark Thomas Kief
  • Patent number: 8755154
    Abstract: 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: Grant
    Filed: September 13, 2011
    Date of Patent: June 17, 2014
    Assignee: Seagate Technology LLC
    Inventors: Dimitar Velikov Dimitrov, Mark William Covington, Wonjoon Jung
  • Publication number: 20140146419
    Abstract: 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: Application
    Filed: November 28, 2012
    Publication date: May 29, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Mark William Covington, Victor Boris Sapozhnikov, Wonjoon Jung, Dimitar Velikov Demitrov, Dian Song, Taras Pohkil
  • Patent number: 8670271
    Abstract: 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: Grant
    Filed: April 5, 2013
    Date of Patent: March 11, 2014
    Assignee: Seagate Technology LLC
    Inventors: Yuankai Zheng, Zheng Gao, Wonjoon Jung, Xuebing Feng, Xiaohua Lou, Haiwen Xi
  • Publication number: 20140001585
    Abstract: 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: Application
    Filed: June 29, 2012
    Publication date: January 2, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Dimitar Velikov Dimitrov, Wonjoon Jung
  • Patent number: 8553369
    Abstract: 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: Grant
    Filed: November 30, 2010
    Date of Patent: October 8, 2013
    Assignee: Seagate Technology LLC
    Inventors: Dion Song, Mark William Covington, Qing He, Dimitar Velikov Dimitrov, Wei Tian, Wonjoon Jung, Sunita Bhardwaj Gangopadhyay
  • Publication number: 20130244192
    Abstract: 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: Application
    Filed: March 14, 2012
    Publication date: September 19, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Qing He, Wonjoon Jung, Mark William Covington, Mark Thomas Kief, Yonghua Chen
  • Publication number: 20130228884
    Abstract: 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: Application
    Filed: April 5, 2013
    Publication date: September 5, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Yuankai Zheng, Zheng Gao, Wonjoon Jung, Xuebing Feng, Xiaohue Lou, Haiwen Xi
  • Patent number: 8519498
    Abstract: 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: Grant
    Filed: September 13, 2012
    Date of Patent: August 27, 2013
    Assignee: Seagate Technology LLC
    Inventors: Yuankai Zheng, Zheng Gao, Wenzhong Zhu, Wonjoon Jung, Haiwen Xi
  • Patent number: 8503135
    Abstract: 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: Grant
    Filed: September 21, 2011
    Date of Patent: August 6, 2013
    Assignee: Seagate Technology LLC
    Inventors: Mark William Covington, Qing He, Wonjoon Jung, Vladyslav Alexandrovich Vas'ko
  • Patent number: 8482883
    Abstract: 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: Grant
    Filed: January 20, 2012
    Date of Patent: July 9, 2013
    Assignee: Seagate Technology LLC
    Inventors: Dimitar V. Dimitrov, Zheng Gao, Wonjoon Jung, Paul Edward Anderson, Olle Gunnar Heinonen
  • Patent number: 8467154
    Abstract: 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: Grant
    Filed: August 31, 2011
    Date of Patent: June 18, 2013
    Assignee: Seagate Technology LLC
    Inventors: Mark William Covington, Dimitar Velikov Dimitrov, Wonjoon Jung, Dion Song
  • Patent number: 8416620
    Abstract: 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: Grant
    Filed: November 11, 2010
    Date of Patent: April 9, 2013
    Assignee: Seagate Technology LLC
    Inventors: Yuankai Zheng, Zheng Gao, Wonjoon Jung, Xuebing Feng, Xiaohua Lou, Haiwen Xi
  • Publication number: 20130071692
    Abstract: 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: Application
    Filed: September 21, 2011
    Publication date: March 21, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Mark William Covington, Mark Thomas Kief, Wonjoon Jung
  • Publication number: 20130071691
    Abstract: 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: Application
    Filed: September 21, 2011
    Publication date: March 21, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Mark William Covington, Qing He, Wonjoon Jung, Vladyslav Alexandrovich Vas'ko
  • Publication number: 20130065085
    Abstract: 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: Application
    Filed: September 13, 2011
    Publication date: March 14, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Dimitar Velikov Dimitrov, Mark William Covington, Wonjoon Jung
  • Patent number: 8395867
    Abstract: 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: Grant
    Filed: March 16, 2009
    Date of Patent: March 12, 2013
    Inventors: Dimitar Velikov Dimitrov, Zheng Gao, Wonjoon Jung, Sharat Batra, Olle Gunnar Heinonen
  • Publication number: 20130050876
    Abstract: 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: Application
    Filed: August 31, 2011
    Publication date: February 28, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Mark William Covington, Dimitar Velikov Dimitrov, Wonjoon Jung, Dion Song
  • Publication number: 20130021697
    Abstract: 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: Application
    Filed: January 20, 2012
    Publication date: January 24, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Dimitar V. Dimitrov, Zheng Gao, Wonjoon Jung, Paul Edward Anderson, Olle Gunnar Heinonen