Patents by Inventor Bruce Alvin Gurney

Bruce Alvin Gurney 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: 9236076
    Abstract: A perpendicular magnetic recording disk includes a template layer below a Ru or Ru alloy underlayer, with a granular Co alloy recording layer formed on the underlayer. substrate. The template layer comprises nanoparticles spaced-apart and partially embedded within a polymer material, with the nanoparticles protruding above the surface of the polymer material. A seed layer covers the surface of the polymer material and the protruding nanoparticles and an underlayer of Ru or a Ru alloy covers the seed layer. The protruding nanoparticles serve as the controlled nucleation sites for the Ru or Ru alloy atoms. The nanoparticle-to-nanoparticle distances can be controlled during the formation of the template layer. This enables control of the Co alloy grain diameter distribution as well as grain-to-grain distance distribution.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: January 12, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Bruce Alvin Gurney, Ricardo Ruiz, Manfred Ernst Schabes, Kentaro Takano, Shi-Ling Chang Wang, Qing Zhu, Han Zou
  • Patent number: 9224412
    Abstract: A continuous-media perpendicular magnetic recording disk has a granular recording layer (RL) with controlled grain pitch distribution and controlled long range ordering of the grains. The disk includes a substrate with a template layer for the RL that comprises a blend of at least two different sized nanoparticles. The nanoparticles have a nanoparticle core with attached polymer ligands. The nanoparticle cores protrude above the surface of the template layer to provide a nonplanar surface topology. The blend of two sizes of nanoparticles causes the RL to have low grain pitch distribution and a disruption of long range ordering so that there are no large magnetic rafts. One of the nanoparticles types has a diameter greater than 105% of the diameter of the other nanoparticle type and is present in the total blend of nanoparticles of between about 5% and 35% or between about 55% and 90%.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: December 29, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Bruce Alvin Gurney, Ricardo Ruiz, Shi-Ling Chang Wang, Qing Zhu, Han Zou
  • Patent number: 9183865
    Abstract: A bit-patterned media (BPM) magnetic recording disk has a cobalt (Co) alloy recording layer (RL), a ruthenium (Ru) containing underlayer (UL), and a noble metal film (NMF) as an interlayer between the RL and the UL. The RL is preferably oxide-free and is a Co alloy, like a CoPtCr alloy, with a hexagonal-close-packed (hcp) crystalline structure with its c-axis oriented substantially perpendicular to the plane of the RL. The NMF is an element from the Pt group (Pt, Pd, Rh, Ir) and Au, or an alloy of two or more of these elements, and has a thickness less than 3.0 nm, preferably between 0.3 and 1.0 nm. The NMF does not interrupt the epitaxial growth of the RL and has little to no effect on the distribution of the RL c-axis orientation. The NMF increases the coercivity (Hc) and perpendicular magnetic anisotropy constant (Ku) of the RL.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: November 10, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Jean-Marc L. Beaujour, Bruce Alvin Gurney, Chu Sy Tran, Dieter K. Weller
  • Publication number: 20150302878
    Abstract: A bit-patterned media (BPM) magnetic recording disk has a cobalt (Co) alloy recording layer (RL), a ruthenium (Ru) containing underlayer (UL), and a noble metal film (NMF) as an interlayer between the RL and the UL. The RL is preferably oxide-free and is a Co alloy, like a CoPtCr alloy, with a hexagonal-close-packed (hcp) crystalline structure with its c-axis oriented substantially perpendicular to the plane of the RL. The NMF is an element from the Pt group (Pt, Pd, Rh, Ir) and Au, or an alloy of two or more of these elements, and has a thickness less than 3.0 nm, preferably between 0.3 and 1.0 nm. The NMF does not interrupt the epitaxial growth of the RL and has little to no effect on the distribution of the RL c-axis orientation. The NMF increases the coercivity (Hc) and perpendicular magnetic anisotropy constant (Ku) of the RL.
    Type: Application
    Filed: April 17, 2014
    Publication date: October 22, 2015
    Applicant: HGST Netherlands B.V.
    Inventors: Jean-Marc L. Beaujour, Bruce Alvin Gurney, Chu Sy Tran, Dieter K. Weller
  • Publication number: 20150221330
    Abstract: A continuous-media perpendicular magnetic recording disk has a granular recording layer (RL) with controlled grain pitch distribution and controlled long range ordering of the grains. The disk includes a substrate with a template layer for the RL that comprises a blend of at least two different sized nanoparticles. The nanoparticles have a nanoparticle core with attached polymer ligands. The nanoparticle cores protrude above the surface of the template layer to provide a nonplanar surface topology. The blend of two sizes of nanoparticles causes the RL to have low grain pitch distribution and a disruption of long range ordering so that there are no large magnetic rafts. One of the nanoparticles types has a diameter greater than 105% of the diameter of the other nanoparticle type and is present in the total blend of nanoparticles of between about 5% and 35% or between about 55% and 90%.
    Type: Application
    Filed: January 31, 2014
    Publication date: August 6, 2015
    Applicant: HGST Netherlands B.V.
    Inventors: Bruce Alvin Gurney, Ricardo Ruiz, Shi-Ling Chang Wang, Qing Zhu, Han Zou
  • Patent number: 8891189
    Abstract: Disk drives with sliders including with an impedance compensation network in the signal path for the read sensor are described. The read signal bandwidth at the preamplifier is improved by the impedance compensation network to allow signals in the multi-GHz range from spin torque oscillators as well as tunnel magnetoresistance (TMR) sensors to be used. An embodiment of the invention achieves a signal layout balance by constructing two inductor-capacitor pair structures on the trailing edge of the slider that are integrated into the differential read signal traces. The differential balanced structure helps to suppress external signal interference pick-up from transferring from common-mode pick-up to differential mode.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: November 18, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: John Contreras, Samir Y. Garzon, Bruce Alvin Gurney, David John Seagle
  • Patent number: 8821736
    Abstract: A method for making a perpendicular magnetic recording disk includes forming a template layer below a Ru or Ru alloy underlayer, with a granular Co alloy recording layer formed on the underlayer. The template layer is formed by depositing a solution of a polymer with a functional end group and nanoparticles, allowing the solution to dry, annealing the polymer layer to thereby form a polymer layer with embedded spaced-apart nanoparticles, and then etching the polymer layer to a depth sufficient to partially expose the nanoparticles so they protrude above the surface of the polymer layer. The protruding nanoparticles serve as controlled nucleation sites for the Ru or Ru alloy atoms. The nanoparticle-to-nanoparticle distances can be controlled during the formation of the template layer. This enables control of the Co alloy grain diameter distribution as well as grain-to-grain distance distribution.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: September 2, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Bruce Alvin Gurney, Dan Saylor Kercher, Alan C Lam, Ricardo Ruiz, Manfred Ernst Schabes, Kentaro Takano, Shi-Ling Chang Wang, Qing Zhu
  • Patent number: 8824084
    Abstract: A perpendicular magnetic recording disk has servo regions that have a patterned underlayer with seed layer pillars formed on the underlayer pillars above the underlayer trenches. The underlayer is made of an oxidizable material. Magnetic recording material is located on the seed layer pillars and on an oxide layer in the underlayer trenches. The magnetic material in the trenches exhibits a magnetic field substantially less than the magnetic field exhibited by the magnetic material on the seed layer pillars, which has perpendicular magnetic anisotropy. The reduced magnetic field from the trenches results from structural differences between the magnetic material on the seed layer pillars and in the trenches, such as smaller grain size of the magnetic material on the seed layer pillars and a wider distribution of crystallographic axes of the magnetic material in the trenches. The seed layer may be made of a material substantially non-reactive with oxygen.
    Type: Grant
    Filed: April 28, 2014
    Date of Patent: September 2, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Bruce Alvin Gurney, En Yang
  • Publication number: 20140231383
    Abstract: A method for making a perpendicular magnetic recording disk includes forming a template layer below a Ru or Ru alloy underlayer, with a granular Co alloy recording layer formed on the underlayer. The template layer is formed by depositing a solution of a polymer with a functional end group and nanoparticles, allowing the solution to dry, annealing the polymer layer to thereby form a polymer layer with embedded spaced-apart nanoparticles, and then etching the polymer layer to a depth sufficient to partially expose the nanoparticles so they protrude above the surface of the polymer layer. The protruding nanoparticles serve as controlled nucleation sites for the Ru or Ru alloy atoms. The nanoparticle-to-nanoparticle distances can be controlled during the formation of the template layer. This enables control of the Co alloy grain diameter distribution as well as grain-to-grain distance distribution.
    Type: Application
    Filed: February 20, 2013
    Publication date: August 21, 2014
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Bruce Alvin Gurney, Dan Saylor Kercher, Alan C. Lam, Ricardo Ruiz, Manfred Ernst Schabes, Kentaro Takano, Shi-Ling Chang Wang, Qing Zhu
  • Publication number: 20140234665
    Abstract: A perpendicular magnetic recording disk includes a template layer below a Ru or Ru alloy underlayer, with a granular Co alloy recording layer formed on the underlayer. substrate. The template layer comprises nanoparticles spaced-apart and partially embedded within a polymer material, with the nanoparticles protruding above the surface of the polymer material. A seed layer covers the surface of the polymer material and the protruding nanoparticles and an underlayer of Ru or a Ru alloy covers the seed layer. The protruding nanoparticles serve as the controlled nucleation sites for the Ru or Ru alloy atoms. The nanoparticle-to-nanoparticle distances can be controlled during the formation of the template layer. This enables control of the Co alloy grain diameter distribution as well as grain-to-grain distance distribution.
    Type: Application
    Filed: February 20, 2013
    Publication date: August 21, 2014
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Bruce Alvin Gurney, Ricardo Ruiz, Manfred Ernst Schabes, Kentaro Takano, Shi-Ling Chang Wang, Qing Zhu, Han Zou
  • Patent number: 8760817
    Abstract: A spin accumulation sensor having a three terminal design that allows the free layer to be located at the air bearing surface. A non-magnetic conductive spin transport layer extends from a free layer structure (located at the ABS) to a reference layer structure removed from the ABS. The sensor includes a current or voltage source for applying a current across a reference layer structure. The current or voltage source has a lead that is connected with the non-magnetic spin transport layer and also to electric ground. Circuitry for measuring a signal voltage measures a voltage between a shield that is electrically connected with the free layer structure and the ground. The free layer structure can include a spin diffusion layer that ensures that all spin current is completely dissipated before reaching the lead to the voltage source, thereby preventing shunting of the spin current to the voltage source.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: June 24, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Thomas Dudley Boone, Jr., Bruce Alvin Gurney, Neil Smith
  • Patent number: 8675309
    Abstract: A spin-torque oscillator with antiferromagnetically-coupled free layers has at least one of the free layers with increased magnetic damping. The Gilbert magnetic damping parameter (?) is at least 0.05. The damped free layer may contain as a dopant one or more damping elements selected from the group consisting of Pt, Pd and the 15 lanthanide elements. The free layer damping may also be increased by a damping layer adjacent the free layer. One type of damping layer may be an antiferromagnetic material, like a Mn alloy. As a modification to the antiferromagnetic damping layer, a bilayer damping layer may be formed of the antiferromagnetic layer and a nonmagnetic metal electrically conductive separation layer between the free layer and the antiferromagnetic layer. Another type of damping layer may be one formed of one or more of the elements selected from Pt, Pd and the lanthanides.
    Type: Grant
    Filed: April 6, 2013
    Date of Patent: March 18, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Patrick Mesquita Braganca, Bruce Alvin Gurney
  • Patent number: 8654465
    Abstract: A method, apparatus, and system are provided for implementing spin-torque oscillator (STO) sensing with a demodulator for hard disk drives. The demodulator measures an instantaneous phase of the readback signal from a STO sensor and converts the readback signal into a signal that is proportional to the magnetic field affecting the STO frequency during a bit time. The converted signal is used for processing by conventional data detection electronics.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: February 18, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Patrick Mesquita Braganca, Richard Leo Galbraith, Bruce Alvin Gurney, Neil Smith, Bruce Wilson, Rehan Ahmed Zakai
  • Patent number: 8634168
    Abstract: A structure for preventing Electrostatic Discharge (ESD) damage to a magnetoresistive sensor during manufacture. The structure includes a switching element that can be switched off during testing of the sensor and then switched back on to provide ESD shunting to the sensor. The switch can be a thermally activated mechanical relay built onto the slider. The switch could also be a programmable resistor that includes a solid electrolyte sandwiched between first and second electrodes. One of the electrodes functions as an anode. When voltage is applied in a first direction an ion bridge forms across through the electrolyte across electrodes making the resistor conductive. When a voltage is applied in a second direction, the ion bridge recedes and the programmable resistor becomes essentially non-conductive.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: January 21, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Thomas Robert Albrecht, Robert E. Fontana, Jr., Bruce Alvin Gurney, Timothy Clark Reiley, Xiao Z. Wu
  • Patent number: 8570677
    Abstract: A method, apparatus, and system are provided for implementing spin-torque oscillator sensing with an enhanced integrated demodulator for hard disk drives. The demodulator receives an input signal from a STO read sensor having an oscillation frequency ? related to the strength of the detected magnetic signal field. The demodulator includes a pair of mixers coupled to a quadrature reference oscillator with respective quadrature components cos(?0t), and sin(?0t) of the quadrature reference oscillator being mixed with a received input signal to form signals at the sum and difference frequencies, ?±?0. Each of these mixer products is lowpass filtered by a respective a lowpass filter to remove the sum frequency components for providing a demodulator output signal that is directly proportional the STO oscillation frequency ?. The demodulator output signal is used for processing by data detection electronics.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: October 29, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Patrick Mesquita Braganca, Richard Leo Galbraith, Bruce Alvin Gurney, Neil Smith, Bruce Wilson, Rehan Ahmed Zakai
  • Patent number: 8553346
    Abstract: A method, apparatus, and system for implementing spin-torque oscillator (STO) sensing with an enhanced delay control feedback circuit for hard disk drives. A detector receives an input signal from a STO read sensor having an oscillation frequency related to the strength of the detected magnetic signal field. The received input signal is mixed with a time delayed input signal for providing a detector output signal. A low frequency component signal of the detector output signal is monitored and a delay control feedback is applied to an adjustable time delay to bias the DC signal of the detector output signal.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: October 8, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Patrick Mesquita Braganca, Richard Leo Galbraith, Bruce Alvin Gurney, Neil Smith, Bruce Wilson, Rehan Ahmed Zakai
  • Patent number: 8514519
    Abstract: A magnetic head having a magnetic wiggler structure for initiating a high frequency magnetic oscillation in a magnetic to improve media-writeability and increase data density. The wiggler structure includes a plurality of magnetic layers that are antiparallel coupled with one another across non-magnetic antiparallel coupling layers. The wiggler structure is arranged just up-track from the point of data writing so that the high frequency oscillation is initiated just prior to the writing of data on the magnetic media.
    Type: Grant
    Filed: October 21, 2009
    Date of Patent: August 20, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Bruce Alvin Gurney, Manfred Ernst Schabes, Bruce Alexander Wilson
  • Publication number: 20130148224
    Abstract: A method, apparatus, and system are provided for implementing spin-torque oscillator sensing with an enhanced integrated demodulator for hard disk drives. The demodulator receives an input signal from a STO read sensor having an oscillation frequency ? related to the strength of the detected magnetic signal field. The demodulator includes a pair of mixers coupled to a quadrature reference oscillator with respective quadrature components cos(?0t), and sin(?0t) of the quadrature reference oscillator being mixed with a received input signal to form signals at the sum and difference frequencies, ?±?0. Each of these mixer products is lowpass filtered by a respective a lowpass filter to remove the sum frequency components for providing a demodulator output signal that is directly proportional the STO oscillation frequency ?. The demodulator output signal is used for processing by data detection electronics.
    Type: Application
    Filed: December 9, 2011
    Publication date: June 13, 2013
    Applicant: Hitachi Global Storage Technologies Netherlands. B.V.
    Inventors: Patrick Mesquita Braganca, Richard Leo Galbraith, Bruce Alvin Gurney, Neil Smith, Bruce Wilson, Rehan Ahmed Zakai
  • Publication number: 20130148229
    Abstract: A method, apparatus, and system for implementing spin-torque oscillator (STO) sensing with an enhanced delay control feedback circuit for hard disk drives. A detector receives an input signal from a STO read sensor having an oscillation frequency related to the strength of the detected magnetic signal field. The received input signal is mixed with a time delayed input signal for providing a detector output signal. A low frequency component signal of the detector output signal is monitored and a delay control feedback is applied to an adjustable time delay to bias the DC signal of the detector output signal.
    Type: Application
    Filed: December 9, 2011
    Publication date: June 13, 2013
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Patrick Mesquita Braganca, Richard Leo Galbraith, Bruce Alvin Gurney, Neil Smith, Bruce Wilson, Rehan Ahmed Zakai
  • Publication number: 20130148223
    Abstract: A method, apparatus, and system are provided for implementing spin-torque oscillator (STO) sensing with a demodulator for hard disk drives. The demodulator measures an instantaneous phase of the readback signal from a STO sensor and converts the readback signal into a signal that is proportional to the magnetic field affecting the STO frequency during a bit time. The converted signal is used for processing by conventional data detection electronics.
    Type: Application
    Filed: December 9, 2011
    Publication date: June 13, 2013
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Patrick Mesquita Braganca, Richard Leo Galbraith, Bruce Alvin Gurney, Neil Smith, Bruce Wilson, Rehan Ahmed Zakai