Patents by Inventor Dimitar Velikov Dimitrov

Dimitar Velikov Dimitrov 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: 9218823
    Abstract: A read head includes a bottom shield and a bottom isolation layer that electrically isolates the bottom shield. The read head includes left and right reader stacks having respective bottom layers disposed on at least a portion of the bottom isolation layer. The left and right reader stacks are cross-track adjacent to one another. The read head also includes left and right bottom contacts electrically coupled to respective left and right bottom layers. A top shield is configured as a common top contact electrically coupled to respective top layers of the left and right reader stacks.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: December 22, 2015
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Mark Thomas Kief, Dimitar Velikov Dimitrov, Thomas Roy Boonstra
  • Patent number: 9123361
    Abstract: A later spin valve multi-reader includes at least two spin detectors, a spin injector and a spin diffusion medium. The spin diffusion medium bridges the spin detectors and the spin injector. Each of the spin detectors detects a unique spin accumulation signal.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: September 1, 2015
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Mark Thomas Kief, Dimitar Velikov Dimitrov, Javier Ignacio Guzman
  • Publication number: 20150243301
    Abstract: A read head includes a bottom shield and a bottom isolation layer that electrically isolates the bottom shield. The read head includes left and right reader stacks having respective bottom layers disposed on at least a portion of the bottom isolation layer. The left and right reader stacks are cross-track adjacent to one another. The read head also includes left and right bottom contacts electrically coupled to respective left and right bottom layers. A top shield is configured as a common top contact electrically coupled to respective top layers of the left and right reader stacks.
    Type: Application
    Filed: February 25, 2014
    Publication date: August 27, 2015
    Applicant: Seagate Technology LLC
    Inventors: Mark Thomas Kief, Dimitar Velikov Dimitrov, Thomas Roy Boonstra
  • Patent number: 9099109
    Abstract: A data reader may be configured at least with a magnetic stack that has a first magnetic layer separated from a second magnetic layer by a non-magnetic spacer layer. The first magnetic layer may have an areal extent on an air bearing surface (ABS) that differs from the second magnetic layer while the second magnetic layer can be configured with a first plurality of linear sidewalls that are each angled with respect to a second plurality of linear sidewalls of the first magnetic layer.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: August 4, 2015
    Assignee: Seagate Technology LLC
    Inventors: Dimitar Velikov Dimitrov, Dian Song, Mark Thomas Kief, Sung-Hoon Gee
  • Patent number: 9064509
    Abstract: A data reader may be configured at least with detector and injector stacks that each has a common spin accumulation layer. The detector stack may positioned on an air bearing surface (ABS) while the injector stack is positioned distal the ABS. The injector stack can have a diffusive layer with a larger spin diffusion length than mean free path.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: June 23, 2015
    Assignee: Seagate Technology LLC
    Inventors: Dimitar Velikov Dimitrov, Dian Song, Mark Thomas Kief, Amit Sharma
  • Patent number: 9042061
    Abstract: A data reader may be configured at least with a magnetic stack positioned on an air bearing surface (ABS) and contacting a spin depolarizing layer that is a minority spin current carrier. The spin depolarizing layer can have a thickness and spin diffusion length corresponding to a net zero spin polarization at an interface of the magnetic stack and spin depolarizing layer.
    Type: Grant
    Filed: September 6, 2013
    Date of Patent: May 26, 2015
    Assignee: Seagate Technology LLC
    Inventors: Dimitar Velikov Dimitrov, Dian Song, Mark Thomas Kief, Amit Sharma
  • Patent number: 9019664
    Abstract: Implementations disclosed herein allow a signal detected by a magnetoresistive (MR) sensor to be improved by providing for one or more regions of reduced anisotropy proximal to a sensor stack within a shielding structure.
    Type: Grant
    Filed: May 20, 2013
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: Dion Song, Dimitar Velikov Dimitrov, Victor Boris Sapozhnikov, Mohammed Sharia Ullah Patwari
  • Patent number: 9001474
    Abstract: An apparatus can be generally directed to a magnetic stack having a magnetically free layer positioned on an air bearing surface (ABS). The magnetically free layer can be biased to a predetermined magnetization in various embodiments by a biasing structure that is coupled with the magnetically free layer and positioned distal the ABS.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: April 7, 2015
    Assignee: Seagate Technology LLC
    Inventors: Mark William Covington, Dimitar Velikov Dimitrov, Dian Song
  • Publication number: 20150070800
    Abstract: A data reader may be configured at least with detector and injector stacks that each has a common spin accumulation layer. The detector stack may positioned on an air bearing surface (ABS) while the injector stack is positioned distal the ABS. The injector stack can have a diffusive layer with a larger spin diffusion length than mean free path.
    Type: Application
    Filed: September 10, 2013
    Publication date: March 12, 2015
    Applicant: Seagate Technology LLC
    Inventors: Dimitar Velikov Dimitrov, Dian Song, Mark Thomas Kief, Amit Sharma
  • Publication number: 20150070799
    Abstract: A data reader may be configured at least with a magnetic stack positioned on an air bearing surface (ABS) and contacting a spin depolarizing layer that is a minority spin current carrier. The spin depolarizing layer can have a thickness and spin diffusion length corresponding to a net zero spin polarization at an interface of the magnetic stack and spin depolarizing layer.
    Type: Application
    Filed: September 6, 2013
    Publication date: March 12, 2015
    Applicant: Seagate Technology LLC
    Inventors: Dimitar Velikov Dimitrov, Dian Song, Mark Thomas Kief, Amit Sharma
  • Publication number: 20150062757
    Abstract: A data reader may be configured at least with a magnetic stack that has a first magnetic layer separated from a second magnetic layer by a non-magnetic spacer layer. The first magnetic layer may have an areal extent on an air bearing surface (ABS) that differs from the second magnetic layer while the second magnetic layer can be configured with a first plurality of linear sidewalls that are each angled with respect to a second plurality of linear sidewalls of the first magnetic layer.
    Type: Application
    Filed: September 5, 2013
    Publication date: March 5, 2015
    Applicant: Seagate Technology LLC
    Inventors: Dimitar Velikov Dimitrov, Dian Song, Mark Thomas Kief, Sung-Hoon Gee
  • Patent number: 8970991
    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: Grant
    Filed: March 12, 2013
    Date of Patent: March 3, 2015
    Assignee: Seagate Technology LLC
    Inventors: Dimitar Velikov Dimitrov, Dian Song, Wonjoon Jung, Mark William Covington, Mark Thomas Kief
  • 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: 20140340792
    Abstract: An apparatus can be generally directed to a magnetic stack having a magnetically free layer positioned on an air bearing surface (ABS). The magnetically free layer can be biased to a predetermined magnetization in various embodiments by a biasing structure that is coupled with the magnetically free layer and positioned distal the ABS.
    Type: Application
    Filed: July 31, 2014
    Publication date: November 20, 2014
    Inventors: Mark William Covington, Dimitar Velikov Dimitrov, Dian Song
  • Publication number: 20140340793
    Abstract: Implementations disclosed herein allow a signal detected by a magnetoresistive (MR) sensor to be improved by providing for one or more regions of reduced anisotropy proximal to a sensor stack within a shielding structure.
    Type: Application
    Filed: May 20, 2013
    Publication date: November 20, 2014
    Applicant: Seagate Technology LLC
    Inventors: Dion Song, Dimitar Velikov Dimitrov, Victor Boris Sapozhnikov, Mohammed Sharia Ullah Patwari
  • 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: 8837092
    Abstract: An apparatus can be generally directed to a magnetic stack having a magnetically free layer positioned on an air bearing surface (ABS). The magnetically free layer can be biased to a predetermined magnetization in various embodiments by a biasing structure that is coupled with the magnetically free layer and positioned distal the ABS.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: September 16, 2014
    Assignee: Seagate Technology LLC
    Inventors: Mark William Covington, Dimitar Velikov Dimitrov, Dian Song
  • Patent number: 8780508
    Abstract: A magnetic element is generally provided that can be implemented as a transducing head. Various embodiments may configure a magnetic stack having a magnetically free layer with a predetermined magnetization. A side shield lamination can be separated from the magnetic stack on an air hearing surface (ABS) and biased to a bias magnetization that opposes the predetermined magnetization.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: July 15, 2014
    Assignee: Seagate Technology LLC
    Inventors: Dimitar Velikov Dimitrov, Dian Song, Mark William Covington
  • 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
  • Patent number: 8749924
    Abstract: Various embodiments can have a data read stack positioned on an air bearing surface (ABS). The data read stack may be disposed between first and second buffer layers, where at least one of the buffer layers can be configured to provide a predetermined shunt ratio for the data read stack.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: June 10, 2014
    Assignee: Seagate Technology LLC
    Inventors: Dimitar Velikov Dimitrov, Dian Song, Mark William Covington