Patents by Inventor Muhammad Asif Bashir

Muhammad Asif Bashir 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: 11557314
    Abstract: Embodiments of the present disclosure generally relate to magnetic recording systems, and more particularly to a magnetic recording system with a current-assisted write head. The write head comprises a main pole, a trailing shield disposed above the main pole, a trailing gap disposed between the main pole and the trailing shield, a side shield surrounding three sides of the main pole, the side shield being in contact with and disposed below the trailing shield and the trailing gap, and a side gap disposed between the side shield and each of the three sides of the main pole. The side gap comprises a non-magnetic electrically-conducting material to dissipate heat away from the main pole, lowering the resistance and temperature rise due to heating. The trailing gap may further comprise a non-magnetic electrically-conducting material. The write head may have a two terminal or three terminal connection configuration.
    Type: Grant
    Filed: June 26, 2019
    Date of Patent: January 17, 2023
    Assignee: Western Digital Technologies, Inc.
    Inventors: Muhammad Asif Bashir, Zhigang Bai, Yaguang Wei, Terence Lam, Youfeng Zheng, Changqing Shi, Michael Kuok San Ho, Xinjiang Shen, Suping Song, Lijie Guan, Venkatesh Chembrolu
  • Patent number: 11532329
    Abstract: A heat-assisted magnetic recording (HAMR) head has a slider with a gas-bearing-surface (GBS). The slider supports a near-field transducer (NFT) and a main magnetic pole that has a step or recess in the NFT-facing surface near the GBS that contains plasmonic material. A thermal shunt is located between the NFT and the main pole to allow heat to be transferred away from the optical spot generated by the NFT. The NFT-facing surface of the main pole that is recessed from the step away from the GBS is in contact with the thermal shunt, and the thermal shunt is in contact with the plasmonic material in the step in the back region recessed from the GBS, so there is no increase in the spacing between the NFT and a large portion of the main pole.
    Type: Grant
    Filed: January 31, 2022
    Date of Patent: December 20, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Takuya Matsumoto, Barry Cushing Stipe, Muhammad Asif Bashir
  • Publication number: 20220399035
    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: Application
    Filed: June 11, 2021
    Publication date: December 15, 2022
    Inventors: Alexander GONCHAROV, Muhammad ASIF BASHIR, Petrus Antonius VAN DER HEIJDEN
  • Patent number: 11508401
    Abstract: Aspects of the present disclosure generally relate to a magnetic recording head of a magnetic recording device that facilitates generating a downtrack magnetic bias field to enhance writing. During magnetic writing using the magnetic recording head, a bias current is directed in a cross-track direction on the trailing side of the main pole. Bias current flowing in the cross-track direction on a leading side of the main pole is reduced or eliminated. The bias current flowing in the cross-track direction on the trailing side of the main pole facilitates generating a magnetic field in a downtrack direction. The magnetic field in the downtrack direction is a bias field generated using the bias current. The magnetic bias field in the downtrack direction facilitates enhanced writing performance and increased areal density capability (ADC) for magnetic recording.
    Type: Grant
    Filed: February 23, 2021
    Date of Patent: November 22, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Muhammad Asif Bashir, Petrus Antonius Van Der Heijden, James Terrence Olson, Alexander Goncharov, Zhigang Bai, Yunfei Ding
  • Publication number: 20220358964
    Abstract: A heat-assisted magnetic recording (HAMR) head for recording data in data tracks of a HAMR disk has a gas-bearing slider that supports a near-field transducer (NFT) and a main magnetic pole formed of two layers. The first main pole layer has a cross-track width at the slider's gas-bearing surface (GBS) that tapers down in the direction towards the NFT where the optical spot is formed. The second main pole layer is located away from the NFT and has a substantially wider cross-track width than the first main pole layer so as to provide sufficient magnetic field for writing. Layers of heat sink material are located on the sloped cross-track sides of the tapered first main pole layer to reduce the temperature and thus the likelihood of oxidation of the main pole layers.
    Type: Application
    Filed: July 21, 2022
    Publication date: November 10, 2022
    Applicant: Western Digital Technologies, Inc.
    Inventors: Takuya MATSUMOTO, Muhammad ASIF BASHIR, Hamid BALAMANE, Petrus Antonius VAN DER HEIJDEN, Barry C. STIPE
  • Publication number: 20220358959
    Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a main pole, a trailing shield, and a MAMR stack including at least one magnetic layer. The magnetic layer has a surface facing the main pole, and the surface has a first side at a media facing surface (MFS) and a second side opposite the first side. The length of the second side is substantially less than the length of the first side. By reducing the length of the second side, the area to be switched at a location recessed from the MFS is reduced as a current flowing from the main pole to the trailing shield or from the trailing shield to the main pole. With the reduced area of the magnetic layer, the overall switch time of the magnetic layer is decreased.
    Type: Application
    Filed: July 20, 2022
    Publication date: November 10, 2022
    Applicant: Western Digital Technologies, Inc.
    Inventors: Venkatesh H CHEMBROLU, Muhammad ASIF BASHIR, Petrus Antonius VAN DER HEIJDEN, Terence T. LAM, Yaguang WEI
  • Patent number: 11462243
    Abstract: A heat-assisted magnetic recording (HAMR) head for recording data in data tracks of a HAMR disk has a gas-bearing slider that supports a near-field transducer (NFT) and a main magnetic pole formed of two layers. The first main pole layer has a cross-track width at the slider's gas-bearing surface (GBS) that tapers down in the direction towards the NFT where the optical spot is formed. The second main pole layer is located away from the NFT and has a substantially wider cross-track width than the first main pole layer so as to provide sufficient magnetic field for writing. Layers of heat sink material are located on the sloped cross-track sides of the tapered first main pole layer to reduce the temperature and thus the likelihood of oxidation of the main pole layers.
    Type: Grant
    Filed: July 30, 2020
    Date of Patent: October 4, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Takuya Matsumoto, Muhammad Asif Bashir, Hamid Balamane, Petrus Vanderheijden, Barry Cushing Stripe
  • Patent number: 11437060
    Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a main pole, a trailing shield, and a MAMR stack including at least one magnetic layer. The magnetic layer has a surface facing the main pole, and the surface has a first side at a media facing surface (MFS) and a second side opposite the first side. The length of the second side is substantially less than the length of the first side. By reducing the length of the second side, the area to be switched at a location recessed from the MFS is reduced as a current flowing from the main pole to the trailing shield or from the trailing shield to the main pole. With the reduced area of the magnetic layer, the overall switch time of the magnetic layer is decreased.
    Type: Grant
    Filed: November 30, 2020
    Date of Patent: September 6, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Venkatesh Chembrolu, Muhammad Asif Bashir, Petrus Antonius Van Der Heijden, Terence Lam, Yaguang Wei
  • Patent number: 11417356
    Abstract: The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a main pole, a hot seed layer, and a write assist stack disposed between the main pole and the hot seed layer. In one embodiment, the write assist stack comprises a seed layer, a spin torque layer, and a notch layer. One or more of the seed layer and the notch layer have a first cross-track width and the spin torque layer has a second cross-track width less than the first cross track width. In another embodiment, the write assist stack comprises a seed layer, a spin polarization layer, and a notch layer. One or more of the seed layer and the notch layer have a first cross-track width and the spin polarization layer has a second cross-track width less than the first cross track width.
    Type: Grant
    Filed: June 30, 2020
    Date of Patent: August 16, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Muhammad Asif Bashir, Alexander Goncharov, Petrus Antonius Van Der Hemden, Aron Pentek, Yi Zhang, Venkatesh Chembrolu
  • Patent number: 11043233
    Abstract: Disclosed herein are magnetic write heads and methods of designing them, and data storage devices comprising such write heads. A magnetic write head having leading and trailing sides comprises an air-bearing surface (ABS), a main pole between the leading and trailing sides, a first return pole between the main pole and the leading side, at least one optical near-field generator between the first return pole and the main pole, and a second return pole between the main pole and the trailing side. The main pole comprises a first tapered portion comprising a leading-side edge perpendicular to the ABS, a first trailing-side edge at a first angle to the ABS, and a second trailing-side edge recessed from the ABS and at a second angle to the ABS. The second return pole comprises a second tapered portion adjacent to the ABS and extending toward the main pole.
    Type: Grant
    Filed: June 3, 2020
    Date of Patent: June 22, 2021
    Assignee: Western Digital Technologies, Inc.
    Inventors: Muhammad Asif Bashir, Petrus Antonius Van Der Heijden, Alexander Goncharov, Barry Stipe
  • Patent number: 10997989
    Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. A magnetic recording head comprises a main pole disposed between a leading shield and a trailing shield. A spin torque oscillator is disposed between the main pole and the trailing shield at a media facing surface. A hot seed bilayer is disposed between the spin torque oscillator and the trailing shield, where the hot seed bilayer is conformal with the spin torque oscillator. The hot seed bilayer comprises a first layer comprised of a high magnetic moment material disposed at the media facing surface and a second layer comprised of a low magnetic material recessed from the media facing surface.
    Type: Grant
    Filed: June 11, 2019
    Date of Patent: May 4, 2021
    Assignee: Western Digital Technologies, Inc.
    Inventors: Muhammad Asif Bashir, Alexander Goncharov, Petrus Antonius Van Der Heijden
  • Patent number: 10997990
    Abstract: A magnetic recording head is disclosed having a main pole, a shield hot seed layer positioned at a first side of the main pole, a first material positioned at both a second side and a third side of the main pole, the first material connected to the main pole, a second material positioned adjacent to the first material on the second side and the third side of the main pole, the second material comprised of a spin torque layer, a third material positioned adjacent to the second material on the second side and the third side of the main pole, a fourth material positioned adjacent to the third material on the second side and the third side of the main pole and a side shield connected on an exterior side of the fourth material.
    Type: Grant
    Filed: June 24, 2020
    Date of Patent: May 4, 2021
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Alexander Goncharov, Muhammad Asif Bashir, James Terrence Olson, Petrus Antonius Vanderheijden
  • Publication number: 20210082457
    Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a main pole, a trailing shield, and a MAMR stack including at least one magnetic layer. The magnetic layer has a surface facing the main pole, and the surface has a first side at a media facing surface (MFS) and a second side opposite the first side. The length of the second side is substantially less than the length of the first side. By reducing the length of the second side, the area to be switched at a location recessed from the MFS is reduced as a current flowing from the main pole to the trailing shield or from the trailing shield to the main pole. With the reduced area of the magnetic layer, the overall switch time of the magnetic layer is decreased.
    Type: Application
    Filed: November 30, 2020
    Publication date: March 18, 2021
    Inventors: Venkatesh CHEMBROLU, Muhammad ASIF BASHIR, Petrus Antonius VAN DER HEIJDEN, Terence LAM, Yaguang WEI
  • Patent number: 10943616
    Abstract: A current-assisted magnetic recording write head has an electrically conductive layer in the write gap between the write pole and the trailing shield. Electrical circuitry directs current between the write pole and the trailing shield, through the conductive layer in the write gap. The current through the conductive layer generates an Ampere field substantially orthogonal to the magnetization in the write pole to assist magnetization switching of the write pole. The conductive layer is wider in the cross-track direction than the trailing edge of the write pole and may extend beyond the write pole side gaps so as to be in contact with both the side shields and the trailing shield. The conductive layer may have substantially the same along-the-track thickness across its width or it may have a thicker central region at the write pole trailing edge and thinner side regions.
    Type: Grant
    Filed: September 2, 2020
    Date of Patent: March 9, 2021
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Muhammad Asif Bashir, Venkatesh Chembrolu, Alexander Goncharov, Petrus Antonius Van Der Heijden, Yingjian Chen
  • Patent number: 10923145
    Abstract: A microwave-assisted magnetic recording (MAMR) write head has a spin-torque oscillator (STO) and a ferromagnetic compensation layer between the write pole and trailing shield. The compensation layer is separated from a free layer by a nonmagnetic barrier layer that prevents spin-polarized electrons from the free layer from reaching the compensation layer. The compensation layer may be located between the write pole and the free layer. Electrons become spin-polarized by the compensation layer and are reflected back from the write pole across a nonmagnetic spacer layer. This causes the magnetization of the compensation layer to flip and become antiparallel to the magnetization of the free layer. The compensation layer thus generates a DC offset field that compensates for the negative effect of the DC shunting field from the free layer.
    Type: Grant
    Filed: March 30, 2020
    Date of Patent: February 16, 2021
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Alexander Goncharov, Muhammad Asif Bashir
  • Publication number: 20210027808
    Abstract: A heat-assisted magnetic recording (HAMR) head for recording data in data tracks of a HAMR disk has a gas-bearing slider that supports a near-field transducer (NFT) and a main magnetic pole formed of two layers. The first main pole layer has a cross-track width at the slider's gas-bearing surface (GBS) that tapers down in the direction towards the NFT where the optical spot is formed. The second main pole layer is located away from the NFT and has a substantially wider cross-track width than the first main pole layer so as to provide sufficient magnetic field for writing. Layers of heat sink material are located on the sloped cross-track sides of the tapered first main pole layer to reduce the temperature and thus the likelihood of oxidation of the main pole layers.
    Type: Application
    Filed: July 23, 2019
    Publication date: January 28, 2021
    Inventors: Takuya Matsumoto, Muhammad Asif Bashir, Hamid Balamane, Petrus VanDerHeijden, Barry Cushing Stipe
  • Patent number: 10891977
    Abstract: A microwave assisted magnetic recording (MAMR) write head includes a main pole and a trailing shield. A spin torque oscillator device is disposed between the main pole and the trailing shield. The spin torque oscillator device includes a free layer. A trailing shield hot seed layer is disposed between the spin torque oscillator device and the trailing shield. The trailing shield hot seed layer includes a magnetic material doped with a rare earth element. In certain embodiments, the trailing shield hot seed layer includes the rare earth element in an atomic percent content from about 2% to about 10% atomic percent. In certain embodiments, the trailing shield hot seed layer has an intrinsic damping from about 0.02 to about 0.2.
    Type: Grant
    Filed: July 8, 2020
    Date of Patent: January 12, 2021
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Alexander Goncharov, Muhammad Asif Bashir, Petrus Antonius Van Der Heijden
  • Publication number: 20200402532
    Abstract: A current-assisted magnetic recording write head has an electrically conductive layer in the write gap between the write pole and the trailing shield. Electrical circuitry directs current between the write pole and the trailing shield, through the conductive layer in the write gap. The current through the conductive layer generates an Ampere field substantially orthogonal to the magnetization in the write pole to assist magnetization switching of the write pole. The conductive layer is wider in the cross-track direction than the trailing edge of the write pole and may extend beyond the write pole side gaps so as to be in contact with both the side shields and the trailing shield. The conductive layer may have substantially the same along-the-track thickness across its width or it may have a thicker central region at the write pole trailing edge and thinner side regions.
    Type: Application
    Filed: September 2, 2020
    Publication date: December 24, 2020
    Inventors: Muhammad ASIF BASHIR, Venkatesh CHEMBROLU, Alexander GONCHAROV, Petrus Antonius VAN DER HEIJDEN, Yingjian CHEN
  • Patent number: 10872626
    Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a main pole, a trailing shield, and a MAMR stack including at least one magnetic layer. The magnetic layer has a surface facing the main pole, and the surface has a first side at a media facing surface (MFS) and a second side opposite the first side. The length of the second side is substantially less than the length of the first side. By reducing the length of the second side, the area to be switched at a location recessed from the MFS is reduced as a current flowing from the main pole to the trailing shield or from the trailing shield to the main pole. With the reduced area of the magnetic layer, the overall switch time of the magnetic layer is decreased.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: December 22, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Venkatesh Chembrolu, Muhammad Asif Bashir, Petrus Antonius Van Der Heijden, Terence Lam, Yaguang Wei
  • Patent number: 10872627
    Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a trailing shield, a main pole, an STO disposed between the trailing shield and the main pole, and a non-magnetic conductive structure adjacent to the main pole and in contact with the STO. The STO includes an FGL and an SPL, and the FGL is disposed between the main pole and the SPL. The FGL includes a side extending over the main pole and at least a portion of the non-magnetic conductive structure. With the FGL disposed proximate to the main pole and over at least a portion of the non-magnetic conductive structure, current crowding and disturbance from the trailing shield are minimized.
    Type: Grant
    Filed: August 12, 2020
    Date of Patent: December 22, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Quang Le, Yongchul Ahn, Susumu Okamura, Zheng Gao, Alexander Goncharov, Muhammad Asif Bashir, Petrus Antonius Van Der Heijden, James Mac Freitag