Patents by Inventor Alexander GONCHAROV

Alexander GONCHAROV 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).

  • Publication number: 20240355353
    Abstract: The present disclosure generally relates to a magnetic recording head for magnetic media, such as a magnetic media drive. The head has a main pole, trailing shield, leading shield, first side shield, and second side shield. One side shield is electrically connected to the trailing shield and electrically disconnected from the leading shield. The other side shield is electrically connected to the leading shield and electrically disconnected from the trailing shield. The side shields are electrically connected through a hot seed layer and/or a nonmagnetic electrically conductive layer that is electrically disconnected from the main pole. Such an arrangement results in a current path from the trailing shield, through the side shields, around the main pole, and to the leading shield, which results in reduced resistance.
    Type: Application
    Filed: July 19, 2023
    Publication date: October 24, 2024
    Applicant: Western Digital Technologies, Inc.
    Inventors: Muhammad ASIF BASHIR, Alexander GONCHAROV, Daniel BAI, Yunfei DING
  • Publication number: 20240321296
    Abstract: The present disclosure generally relates to a magnetic recording system comprising a magnetic recording head. The magnetic recording head comprises a main pole, a shield, and a spintronic device disposed between the main pole and the shield. The spintronic device comprises a field generation layer (FGL) spaced a distance of about 2 nm to about 3 nm from the main pole, a first spacer layer disposed on the FGL, a spin torque layer (STL) disposed on the first spacer layer, a second spacer layer disposed on the STL, and a negative polarization layer (NPL) disposed between the second spacer layer and the shield. The spintronic device has a length of about 17 nm to about 21. During operation, the STL has a magnetization precession of about 16 degrees to about 170 degrees, and the FGL has a magnetization precession of about 60 degrees to about 70 degrees.
    Type: Application
    Filed: July 31, 2023
    Publication date: September 26, 2024
    Applicant: Western Digital Technologies, Inc.
    Inventors: Alexander GONCHAROV, Muhammad ASIF BASHIR, Yunfei DING
  • Patent number: 12094498
    Abstract: The present disclosure generally relates to a spin torque element disposed between a main pole and a shield in a magnetic recording head. The shield could be a trailing shield, a side shield, or a leading shield. The spin torque element includes a dual layer spin transfer structure that is spaced from magnetic layers on either side using spacer layers. One magnetic layer that faces a positive polarizer has a positive polarization while another magnetic layer facing the negative polarizer has a negative polarization. As such, torque in the spacer layers is maximized when the direction of the magnetization in the STL is opposite to the gap field.
    Type: Grant
    Filed: July 19, 2023
    Date of Patent: September 17, 2024
    Assignee: Western Digital Technologies, Inc.
    Inventors: Alexander Goncharov, James Mac Freitag, Susumu Okamura, Muhammad Asif Bashir
  • Patent number: 12057146
    Abstract: The present disclosure generally relates to a magnetic recording head comprising a spintronic device. By electrically coupling the side shielding of the head (acting as current leads) to the spin Hall layer of the spintronic device, the current path length is optimally provided across the spin Hall layer as well as fitting within the space constraints of the overall head. In addition, by using an antiferromagnetic insulator as a spacer between the spin Hall layer and the magnetic spin torque layer of the spintronic device, electrically shunting into the magnetic spin torque layer is reduced, maximizing the spin torque and reducing loss of efficiency due to shunting. Thus, the magnetic recording head may utilize the energy assistance from the spintronic device without reducing the quality and reliability of the write head by running an undesirable current through critical components of the write head.
    Type: Grant
    Filed: July 19, 2023
    Date of Patent: August 6, 2024
    Assignee: Western Digital Technologies, Inc.
    Inventors: Shengjie Shi, Alexander Goncharov, Yunfei Ding
  • Patent number: 12057145
    Abstract: Embodiments of the present disclosure relate to magnetic recording heads (e.g., magnetic write heads) for magnetic recording devices (e.g., hard disk drives (HDD's)). A magnetic recording head includes, in a gap between a write pole and a trailing shield: a spin polarization layer (SPL), a free layer, and a spacer layer between the SPL and free layer. A spin torque layer (STL) is additionally included, and is separated from the free layer by a barrier layer that reduces or eliminates spin torque between the free layer and the STL. In one or more embodiments, to enable a thinner barrier layer, one or more dusting layers are inserted between the write pole and the trailing shield, and the one or more dusting layers are each formed of iron-chromium (FeCr). This helps maintain a thinner or narrower material stack in the gap and enhances writer performance.
    Type: Grant
    Filed: July 12, 2023
    Date of Patent: August 6, 2024
    Assignee: Western Digital Technologies, Inc.
    Inventors: Muhammad Asif Bashir, Alexander Goncharov, Petrus Antonius Van Der Heijden
  • Publication number: 20240233759
    Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole (MP), a shield, and a spintronic device disposed between the MP and the shield. The spintronic device comprises a MP notch disposed on the MP, a first spin torque layer (STL), a second STL, a spin kill layer disposed between the first and second STLs, and a shield notch. The spin kill layer prevents spin torque from being transferred between the first STL and the second STL. In a forward stack where electrons flow from the MP to the shield, the MP notch comprises FeCr and the shield notch comprises CoFe. In a reverse stack where electrons flow from the shield to the MP, the MP notch comprises CoFe and the shield notch comprises FeCr.
    Type: Application
    Filed: July 25, 2023
    Publication date: July 11, 2024
    Applicant: Western Digital Technologies, Inc.
    Inventors: Muhammad ASIF BASHIR, Alexander GONCHAROV, Yaguang WEI
  • Publication number: 20240144963
    Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole, a hot seed layer, and a spintronic device disposed between the main pole and the hot seed layer. The spintronic device comprises two field generation layers (FGLs), two spin polarization layers (SPLs), and two spin kill layers. The second SPL of the spintronic device drives the second FGL. The spintronic device further comprises one or more optional thin negative beta material layers, such as layers comprising FeCr, disposed in contact with at least one of the spin kill layers. When electric current is applied, the spin kill layers and optional negative beta material layers eliminate or reduce any spin torque between the FGLs and the SPLs.
    Type: Application
    Filed: July 25, 2023
    Publication date: May 2, 2024
    Applicant: Western Digital Technologies, Inc.
    Inventors: Muhammad ASIF BASHIR, Alexander GONCHAROV, Zhigang BAI, Masato SHIIMOTO, Yunfei DING
  • Publication number: 20240144964
    Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a first current flow in a cross-track direction through a trailing shield. In one or more embodiments, a second current flows in a cross-track direction around the main pole. The magnetic recording device comprises a main pole disposed between a trailing shield, a leading shield, and side shields. A trailing gap is disposed between the side shields and the trailing shield. A high moment seed layer is disposed between the main pole and the trailing shield. A first insulation layer is disposed within the trailing shield and directs the first current through the trailing shield, guided to the proximity of the main pole. A second insulation layer, disposed below the trailing shield, directs the second current through the trailing shield, or alternatively through the side shields and around the main pole.
    Type: Application
    Filed: January 9, 2024
    Publication date: May 2, 2024
    Applicant: Western Digital Technologies, Inc.
    Inventors: Alexander GONCHAROV, Muhammad ASIF BASHIR, Petrus Antonius VAN DER HEIJDEN, Yunfei DING, Zhigang BAI, James Terrence OLSON
  • Publication number: 20240144961
    Abstract: Embodiments of the present disclosure relate to magnetic recording heads (e.g., magnetic write heads) for magnetic recording devices (e.g., hard disk drives (HDD's)). A magnetic recording head includes, in a gap between a write pole and a trailing shield: a spin polarization layer (SPL), a free layer, and a spacer layer between the SPL and free layer. A spin torque layer (STL) is additionally included, and is separated from the free layer by a barrier layer that reduces or eliminates spin torque between the free layer and the STL. In one or more embodiments, to enable a thinner barrier layer, one or more dusting layers are inserted between the write pole and the trailing shield, and the one or more dusting layers are each formed of iron-chromium (FeCr). This helps maintain a thinner or narrower material stack in the gap and enhances writer performance.
    Type: Application
    Filed: July 12, 2023
    Publication date: May 2, 2024
    Applicant: Western Digital Technologies, Inc.
    Inventors: Muhammad ASIF BASHIR, Alexander GONCHAROV, Petrus Antonius VAN DER HEIJDEN
  • Publication number: 20240144962
    Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole, a shield, and a spintronic device disposed between the main pole and the shield. The spintronic device comprises two field generation layers (FGLs), two spin polarization layers (SPLs), and two spin kill layers. The spintronic device further comprises one or more optional thin negative beta material layers, such as layers comprising FeCr, disposed in contact with at least one of the spin kill layers. When electric current is applied, the spin kill layers and optional negative beta material layers eliminate or reduce any spin torque between the FGLs and the SPLs.
    Type: Application
    Filed: July 25, 2023
    Publication date: May 2, 2024
    Applicant: Western Digital Technologies, Inc.
    Inventors: Muhammad ASIF BASHIR, Alexander GONCHAROV, Zhigang BAI, Masato SHIIMOTO, Yunfei DING
  • Publication number: 20240135966
    Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole (MP), a shield, and a spintronic device disposed between the MP and the shield. The spintronic device comprises a MP notch disposed on the MP, a first spin torque layer (STL), a second STL, a spin kill layer disposed between the first and second STLs, and a shield notch. The spin kill layer prevents spin torque from being transferred between the first STL and the second STL. In a forward stack where electrons flow from the MP to the shield, the MP notch comprises FeCr and the shield notch comprises CoFe. In a reverse stack where electrons flow from the shield to the MP, the MP notch comprises CoFe and the shield notch comprises FeCr.
    Type: Application
    Filed: July 24, 2023
    Publication date: April 25, 2024
    Applicant: Western Digital Technologies, Inc.
    Inventors: Muhammad ASIF BASHIR, Alexander GONCHAROV, Yaguang WEI
  • Publication number: 20240112694
    Abstract: Aspects of the present disclosure generally relate to a magnetic recording head assembly that includes an external alternating current (AC) source. A magnetic recording head of the magnetic recording head assembly includes a conductive structure between a main pole and a trailing shield. The conductive structure includes a conductive layer, and the conductive layer is nonmagnetic. The magnetic recording head assembly also includes an external AC source to supply AC current that flows through the conductive structure. In one aspect, the conductive structure is between a coil structure and the trailing shield, and the external AC source is coupled to the coil structure. The conductive structure and the external AC source facilitate consistently providing an enhanced AC writing field to facilitate effective and reliable writing, high ADC, high SNR, and reduced jitter.
    Type: Application
    Filed: December 14, 2023
    Publication date: April 4, 2024
    Applicant: Western Digital Technologies, Inc.
    Inventors: Muhammad ASIF BASHIR, Petrus Antonius VAN DER HEIJDEN, James Terrence OLSON, Alexander GONCHAROV, Zhigang BAI, Yunfei DING
  • Patent number: 11900971
    Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a first current flow in a cross-track direction through a trailing shield. In one or more embodiments, a second current flows in a cross-track direction around the main pole. The magnetic recording device comprises a main pole disposed between a trailing shield, a leading shield, and side shields. A trailing gap is disposed between the side shields and the trailing shield. A high moment seed layer is disposed between the main pole and the trailing shield. A first insulation layer is disposed within the trailing shield and directs the first current through the trailing shield, guided to the proximity of the main pole. A second insulation layer, disposed below the trailing shield, directs the second current through the trailing shield, or alternatively through the side shields and around the main pole.
    Type: Grant
    Filed: June 21, 2022
    Date of Patent: February 13, 2024
    Assignee: Western Digital Technologies, Inc.
    Inventors: Alexander Goncharov, Muhammad Asif Bashir, Petrus Antonius Van Der Heijden, Yunfei Ding, Zhigang Bai, James Terrence Olson
  • Patent number: 11894026
    Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a first current flow in a cross-track direction through a trailing shield. In one or more embodiments, a second current flows in a cross-track direction around the main pole. The magnetic recording device comprises a main pole disposed between a trailing shield, a leading shield, and side shields. A trailing gap is disposed between the side shields and the trailing shield. A high moment seed layer is disposed between the main pole and the trailing shield. A first insulation layer is disposed within the trailing shield and directs the first current through the trailing shield, guided to the proximity of the main pole. A second insulation layer, disposed below the trailing shield, directs the second current through the trailing shield, or alternatively through the side shields and around the main pole.
    Type: Grant
    Filed: June 21, 2022
    Date of Patent: February 6, 2024
    Assignee: Western Digital Technologies, Inc.
    Inventors: Alexander Goncharov, Muhammad Asif Bashir, Petrus Antonius Van Der Heijden, Yunfei Ding, Zhigang Bai, James Terrence Olson
  • Patent number: 11881237
    Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a current flow in a cross-track direction around a main pole. The magnetic recording device comprises a main pole disposed between a trailing shield, a leading shield, and side shields. A trailing gap is disposed between the main pole and the trailing shield. A hot seed layer is disposed between the trailing gap and the trailing shield. A first insulation layer is disposed between the hot seed layer and the trailing shield, where the first insulation layer contacts the side shields. A second insulation layer is disposed between the main pole and leading shield, where the second insulation layer contacts the side shields. The first and second insulation layers direct the current through the side shields and across the main pole in a cross-track direction.
    Type: Grant
    Filed: November 24, 2021
    Date of Patent: January 23, 2024
    Assignee: Western Digital Technologies, Inc.
    Inventors: Muhammad Asif Bashir, Edward Hin Pong Lee, Amanda Baer, Aron Pentek, Zhigang Bai, Yunfei Ding, James Terrence Olson, Alexander Goncharov, Petrus Antonius Van Der Heijden
  • Patent number: 11881235
    Abstract: The present disclosure relates to a magnetic recording head having an exchange biased leading shield or leading edge shield (LES). The LES is a bilayer structure. One or more layers are coupled below the LES such that the LES is disposed between the main pole and the one or more layers. The one or more layers exchange bias the LES such that the upper layer of the LES has a magnetization parallel to the magnetization of the trailing shield. The lower layer of the LES has a magnetization that is antiparallel to the magnetization of the upper layer of the LES. The one or more layers set the preferred direction for the lower layer of the LES and sets the LES as a two-domain state without relying upon the anisotropy field (Hk) of either the upper or lower layers of the LES.
    Type: Grant
    Filed: February 22, 2022
    Date of Patent: January 23, 2024
    Assignee: Western Digital Technologies, Inc.
    Inventors: Alexander Goncharov, Zhanjie Li, Terence T. Lam, Suping Song
  • Patent number: 11869548
    Abstract: Aspects of the present disclosure generally relate to a magnetic recording head assembly that includes an external alternating current (AC) source. A magnetic recording head of the magnetic recording head assembly includes a conductive structure between a main pole and a trailing shield. The conductive structure includes a conductive layer, and the conductive layer is nonmagnetic. The magnetic recording head assembly also includes an external AC source to supply AC current that flows through the conductive structure. In one aspect, the conductive structure is between a coil structure and the trailing shield, and the external AC source is coupled to the coil structure. The conductive structure and the external AC source facilitate consistently providing an enhanced AC writing field to facilitate effective and reliable writing, high ADC, high SNR, and reduced jitter.
    Type: Grant
    Filed: February 23, 2021
    Date of Patent: January 9, 2024
    Assignee: Western Digital Technologies, Inc.
    Inventors: Muhammad Asif Bashir, Petrus Antonius Van Der Heijden, James Terrence Olson, Alexander Goncharov, Zhigang Bai, Yunfei Ding
  • Patent number: 11854584
    Abstract: The present disclosure relates to heat-assisted magnetic recording (HAMR) write heads including a waveguide and a main pole having a main pole tip. One or more current paths are provided through the main pole tip. Terminals of the one or more current paths can be coupled to the main pole, a trailing shield, a leading shield, a heat sink layer, a touch pad, a pole diffusion barrier layer, a NTS sensor, or another suitable component of the HAMR write head.
    Type: Grant
    Filed: July 29, 2022
    Date of Patent: December 26, 2023
    Assignee: Western Digital Technologies, Inc.
    Inventors: Muhammad Asif Bashir, Alexander Goncharov, Takuya Matsumoto, Petrus Antonius Van Der Heijden
  • Patent number: 11769522
    Abstract: The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a main pole (MP), a trailing shield (TS), a trailing gap (TG) disposed between the MP and the TS, and a spin torque oscillator (STO) disposed in the TG adjacent to the MP. A notch may be disposed in the TG between the STO and TS. The notch comprises one or more notch interlayers comprising a non-magnetic material and/or a magnetic material. A bump may be disposed in the TG between the TS and the STO or the notch. The bump comprises one or more bump interlayers comprising a non-magnetic material. A hot seed layer may be coupled to the TS adjacent to the bump, the notch, or the STO. The hot seed layer comprises one or more hot seed interlayers comprising a non-magnetic material.
    Type: Grant
    Filed: June 11, 2021
    Date of Patent: September 26, 2023
    Assignee: Western Digital Technologies, Inc.
    Inventors: Alexander Goncharov, Muhammad Asif Bashir, Petrus Antonius Van Der Heijden
  • Publication number: 20230267953
    Abstract: The present disclosure relates to a magnetic recording head having an exchange biased leading shield or leading edge shield (LES). The LES is a bilayer structure. One or more layers are coupled below the LES such that the LES is disposed between the main pole and the one or more layers. The one or more layers exchange bias the LES such that the upper layer of the LES has a magnetization parallel to the magnetization of the trailing shield. The lower layer of the LES has a magnetization that is antiparallel to the magnetization of the upper layer of the LES. The one or more layers set the preferred direction for the lower layer of the LES and sets the LES as a two-domain state without relying upon the anisotropy field (Hk) of either the upper or lower layers of the LES.
    Type: Application
    Filed: February 22, 2022
    Publication date: August 24, 2023
    Applicant: Western Digital Technologies, Inc.
    Inventors: Alexander GONCHAROV, Zhanjie LI, Terence T. LAM, Suping SONG