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).
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Patent number: 8711526Abstract: A magnetic element is generally provided that can be implemented as a transducing head. Various embodiments may configure a magnetic stack to be separated from a side shield lamination on an air bearing surface (ABS). The side shield lamination can be constructed to have a plurality of magnetic and non-magnetic layers each coupled to a top shield.Type: GrantFiled: June 29, 2012Date of Patent: April 29, 2014Assignee: Seagate Technology LLCInventors: Levent Colak, Mark William Covington, Dimitar Velikov Dimitrov, Mark Thomas Kief, Anthony Mack, Dian Song
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Patent number: 8705212Abstract: An apparatus and associated method may be used to produce a magnetic element capable of detecting changes in magnetic states. Various embodiments of the present invention are generally directed to a magnetically responsive lamination of layers with a first portion and a laterally adjacent second portion. The second portion having a predetermined roughness between at least two layers capable of producing orange-peel coupling.Type: GrantFiled: April 25, 2011Date of Patent: April 22, 2014Assignee: Seagate Technology LLCInventors: Jason Bryce Gadbois, Michael Christopher Kautzky, Mark William Covington, Dian Song, Dimitar Velikov Dimitrov, Qing He, Wei Tian, Thomas Boonstra, Sunita Gangopadhyay
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Patent number: 8659855Abstract: A magnetoresistive read sensor with improved sensitivity and stability is described. The sensor is a trilayer stack positioned between two electrodes. The trilayer stack has two free layers separated by a nonmagnetic layer and a biasing magnet positioned at the rear of the stack and separated from the air bearing surface. Current in the sensor is confined to regions close to the air bearing surface by an insulator layer to enhance reader sensitivity.Type: GrantFiled: March 19, 2010Date of Patent: February 25, 2014Assignee: Seagate Technology LLCInventors: Dimitar Velikov Dimitrov, Dion Song, Mark William Covington, James Wessel
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Publication number: 20140004385Abstract: A magnetic element is generally provided that can be implemented as a transducing head. Various embodiments may configure a magnetic stack to be separated from a side shield lamination on an air bearing surface (ABS). The side shield lamination can be constructed to have a plurality of magnetic and non-magnetic layers each coupled to a top shield.Type: ApplicationFiled: June 29, 2012Publication date: January 2, 2014Applicant: SEAGATE TECHNOLOGY LLCInventors: Levent Colak, Mark William Covington, Dimitar Velikov Dimitrov, Mark Thomas Kief, Anthony Mack, Dian Song
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Publication number: 20140004386Abstract: 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: ApplicationFiled: June 29, 2012Publication date: January 2, 2014Applicant: SEAGATE TECHNOLOGY LLCInventors: Mark William Covington, Dimitar Velikov Dimitrov, Dian Song
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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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Publication number: 20140002930Abstract: 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: ApplicationFiled: June 29, 2012Publication date: January 2, 2014Applicant: SEAGATE TECHNOLOGY LLCInventors: Dimitar Velikov Dimitrov, Dian Song, Mark William Covington
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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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Patent number: 8519376Abstract: Nonvolatile resistive memory devices are disclosed. In some embodiments, the memory devices comprise multilayer structures including electrodes, one or more resistive storage layers, and separation layers. The separation layers insulate the resistive storage layers to prevent charge leakage from the storage layers and allow for the use of thin resistive storage layers. In some embodiments, the nonvolatile resistive memory device includes a metallic multilayer comprising two metallic layers about an interlayer. A dopant at an interface of the interlayer and metallic layers can provide a switchable electric field within the multilayer.Type: GrantFiled: October 27, 2009Date of Patent: August 27, 2013Assignee: Seagate Technology LLCInventors: Dimitar Velikov Dimitrov, Insik Jin, Haiwen Xi
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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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Publication number: 20130069642Abstract: Various embodiments can have a magnetically responsive stack positioned on an air bearing surface (ABS) and disposed between at least first and second magnetic shields. Each magnetic shield may have a beveled portion distal to the ABS. The magnetically responsive stack can have a cross-track magnetization anisotropy proximal to the ABS.Type: ApplicationFiled: September 21, 2011Publication date: March 21, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Victor Boris Sapozhnikov, Dimitar Velikov Dimitrov
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Publication number: 20130065084Abstract: 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: ApplicationFiled: September 13, 2011Publication date: March 14, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Dimitar Velikov Dimitrov, Dian Song, Mark William Covington
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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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Patent number: 8309945Abstract: Programmable metallization memory cells having a planarized silver electrode and methods of forming the same are disclosed. The programmable metallization memory cells include a first metal contact and a second metal contact, an ion conductor solid electrolyte material is between the first metal contact and the second metal contact, and either a silver alloy doping electrode separates the ion conductor solid electrolyte material from the first metal contact or the second metal contact, or a silver doping electrode separates the ion conductor solid electrolyte material from the first metal contact. The silver electrode includes a silver layer and a metal seed layer separating the silver layer from the first metal contact.Type: GrantFiled: February 15, 2012Date of Patent: November 13, 2012Assignee: Seagate Technology LLCInventors: Wei Tian, Dexin Wang, Venugopalan Vaithyanathan, Yang Dong, Muralikrishnan Balakrishnan, Ivan Petrov Ivanov, Ming Sun, Dimitar Velikov Dimitrov
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Publication number: 20120268846Abstract: An apparatus and associated method may be used to produce a magnetic element capable of detecting changes in magnetic states. Various embodiments of the present invention are generally directed to a magnetically responsive lamination of layers with a first portion and a laterally adjacent second portion. The second portion having a predetermined roughness between at least two layers capable of producing orange-peel coupling.Type: ApplicationFiled: April 25, 2011Publication date: October 25, 2012Applicant: SEAGATE TECHNOLOGY LLCInventors: Jason Bryce Gadbois, Michael Christopher Kautzky, Mark William Covington, Dian Song, Dimitar Velikov Dimitrov, Qing He, Wei Tian, Thomas Boonstra, Sunita Gangopadhyay
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Patent number: 8289660Abstract: An apparatus includes a magnetoresistive read element, first and second primary shields, and an auxiliary shield. The magnetoresistive read element is located between the first and the second primary shields, and the auxiliary shield is located between the magnetoresistive read element and the first primary shield. In another embodiment, the apparatus includes a plurality of magnets located between a plurality of shields for a magnetoresistive element. The plurality of magnets is optionally offset from the magnetoresistive element.Type: GrantFiled: June 16, 2010Date of Patent: October 16, 2012Assignee: Seagate Technology LLCInventors: Dimitar Velikov Dimitrov, Dion Song
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Patent number: 8288254Abstract: Programmable metallization memory cells having a planarized silver electrode and methods of forming the same are disclosed. The programmable metallization memory cells include a first metal contact and a second metal contact, an ion conductor solid electrolyte material is between the first metal contact and the second metal contact, and either a silver alloy doping electrode separates the ion conductor solid electrolyte material from the first metal contact or the second metal contact, or a silver doping electrode separates the ion conductor solid electrolyte material from the first metal contact. The silver electrode includes a silver layer and a metal seed layer separating the silver layer from the first metal contact.Type: GrantFiled: February 8, 2012Date of Patent: October 16, 2012Assignee: Seagate Technology LLCInventors: Wei Tian, Dexin Wang, Venugopalan Vaithyanathan, Yang Dong, Muralikrishnan Balakrishnan, Ivan Petrov Ivanov, Ming Sun, Dimitar Velikov Dimitrov
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Publication number: 20120134057Abstract: 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: ApplicationFiled: November 30, 2010Publication date: May 31, 2012Applicant: SEAGATE TECHNOLOGY LLCInventors: Dion Song, Mark William Covington, Qing He, Dimitar Velikov Dimitrov, Wei Tian, Wonjoon Jung, Sunita Bhardwaj Gangopadhyay