Patents by Inventor Kumar R. Virwani

Kumar R. Virwani 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: 20230371408
    Abstract: Memory devices having optimized phase change memory (PCM) structures to improve nucleation time variation and methods for forming the phase change memory structures. The PCM structures are composed of layers including a first electrode layer, a PCM layer having a first interface with the first electrode layer comprising a first electrode/PCM interface, and a second electrode layer, having a second interface with the phase change material layer comprising a PCM/second electrode interface. The first electrode/PCM interface and the PCM/second electrode interface are non-flat and configured to reduce statistical variation of nucleation time. Techniques/processes for forming these interfaces include creating serrated or rough edges, forming patterned shapes, and attaching nanodots.
    Type: Application
    Filed: May 13, 2022
    Publication date: November 16, 2023
    Inventors: Lu LIU, Hemant P. RAO, Kumar R. VIRWANI
  • Publication number: 20220246847
    Abstract: A memory device including a memory array comprising a plurality of decks, a respective deck comprising a plurality of memory cells, a respective memory cell comprising a storage element comprising a chalcogenide material; wherein a first deck of the plurality of decks comprises first memory cells with storage elements deposited at a first initial composition of a plurality of elements; and a second deck of the plurality of decks comprises second memory cells with storage elements deposited at a second initial composition of the plurality of elements.
    Type: Application
    Filed: January 29, 2021
    Publication date: August 4, 2022
    Applicant: Intel Corporation
    Inventors: John M. Nugent, Kumar R. Virwani, Fred Daniel Gealy
  • Publication number: 20220181550
    Abstract: A semiconductor device including stacked access device and resistive memory includes a stack disposed on a base structure, the stack including an access device stack and a resistive random-access memory (ReRAM) device stack, sidewall spacers disposed along a portion of the stack, a dielectric layer disposed over the stack, the sidewall spacers and the base structure, and an interlevel dielectric disposed on the dielectric layer.
    Type: Application
    Filed: February 24, 2022
    Publication date: June 9, 2022
    Inventors: Hiroyuki Miyazoe, Gloria W.Y. Fraczak, Kumar R. Virwani, Takashi Ando
  • Patent number: 11289650
    Abstract: A semiconductor device including stacked access device and resistive memory includes a stack disposed on a base structure, the stack including an access device stack and a resistive random-access memory (ReRAM) device stack, sidewall spacers disposed along a portion of the stack, a dielectric layer disposed over the stack, the sidewall spacers and the base structure, and an interlevel dielectric disposed on the dielectric layer.
    Type: Grant
    Filed: March 4, 2019
    Date of Patent: March 29, 2022
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Hiroyuki Miyazoe, Gloria W. Y. Fraczak, Kumar R. Virwani, Takashi Ando
  • Patent number: 11273357
    Abstract: Embodiments relate to a system, program product, and method for use and an artificial intelligence (AI) platform to identify and analyze physical forces related to sensory input. A sensor operatively coupled to an inertial measurement unit (IMU) is activated. An initial position of the IMU responsive to the sensor activation is captured and movement of the IMU from the initial position is recognized. A comparison is preformed, where the captured initial position is compared to a second position which is correlated with the recognized movement. A score based on the performed comparison is determined and a diagnostic assessment based on the performed comparison and determined score is created. The diagnostic assessment is converted to feedback, where the conversion utilizes real-time communication of an instruction of a second movement position of the IMU. Receipt of the feedback physically conveys a manifestation of the feedback to the apparatus.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: March 15, 2022
    Assignee: International Business Machines Corporation
    Inventors: Pawan Chowdhary, Kumar R. Virwani, Charles Thomas Rettner, Bulent N. Kurdi
  • Publication number: 20210305318
    Abstract: A memory cell design is disclosed. The design is particularly well-suited for three-dimensional cross-point (3D X-point) memory configurations. Various embodiments of the memory cell design include a stack of layers having a phase change layer or phase change region that includes nitrogen. The presence of the nitrogen increases crystallization rates of the phase change material during transition from an amorphous state to crystalline state, thus increasing the overall speed of the memory device. In some embodiments, the phase change layer includes a small amount of nitrogen homogenously dispersed within the layer. In some other embodiments, the phase change layer includes one or more regions having nitrogen introduced during the deposition process. In some other embodiments, separate material layers that include nitrogen are provided on one or more sides of the phase change layer.
    Type: Application
    Filed: March 30, 2020
    Publication date: September 30, 2021
    Applicant: INTEL CORPORATION
    Inventors: DAN GEALY, KUMAR R. VIRWANI
  • Patent number: 10903270
    Abstract: A combined semiconductor device is fabricated by forming a first access structure from a mixed ionic electronic conduction (MIEC) material. A first side of a first memory structure is electrically coupled with a first side of the first access structure to form the combination device. A subtractive etching process is applied to the combination device such that a surface of the combination device that is substantially orthogonal to a plane of a substrate of the semiconductor device is within a defined tapering tolerance.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: January 26, 2021
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Robert Bruce, Fabio Carta, Gloria WingYun Fraczak, Hiroyuki Miyazoe, Kumar R. Virwani
  • Publication number: 20200287135
    Abstract: A semiconductor device including stacked access device and resistive memory includes a stack disposed on a base structure, the stack including an access device stack and a resistive random-access memory (ReRAM) device stack, sidewall spacers disposed along a portion of the stack, a dielectric layer disposed over the stack, the sidewall spacers and the base structure, and an interlevel dielectric disposed on the dielectric layer.
    Type: Application
    Filed: March 4, 2019
    Publication date: September 10, 2020
    Inventors: Hiroyuki Miyazoe, Gloria W.Y. Fraczak, Kumar R. Virwani, Takashi Ando
  • Publication number: 20200070033
    Abstract: Embodiments relate to a system, program product, and method for use and an artificial intelligence (AI) platform to identify and analyze physical forces related to sensory input. A sensor operatively coupled to an inertial measurement unit (IMU) is activated. An initial position of the IMU responsive to the sensor activation is captured and movement of the IMU from the initial position is recognized. A comparison is preformed, where the captured initial position is compared to a second position which is correlated with the recognized movement. A score based on the performed comparison is determined and a diagnostic assessment based on the performed comparison and determined score is created. The diagnostic assessment is converted to feedback, where the conversion utilizes real-time communication of an instruction of a second movement position of the IMU. Receipt of the feedback physically conveys a manifestation of the feedback to the apparatus.
    Type: Application
    Filed: August 30, 2018
    Publication date: March 5, 2020
    Applicant: International Business Machines Corporation
    Inventors: Pawan Chowdhary, Kumar R. Virwani, Charles Thomas Rettner, Bulent N. Kurdi
  • Publication number: 20190148453
    Abstract: A combined semiconductor device is fabricated by forming a first access structure from a mixed ionic electronic conduction (MIEC) material. A first side of a first memory structure is electrically coupled with a first side of the first access structure to form the combination device. A subtractive etching process is applied to the combination device such that a surface of the combination device that is substantially orthogonal to a plane of a substrate of the semiconductor device is within a defined tapering tolerance.
    Type: Application
    Filed: December 20, 2018
    Publication date: May 16, 2019
    Applicant: International Business Machines Corporation
    Inventors: Robert Bruce, Fabio Carta, Gloria WingYun Fraczak, Hiroyuki Miyazoe, Kumar R. Virwani
  • Publication number: 20190123101
    Abstract: A combined semiconductor device is fabricated by forming a first access structure from a mixed ionic electronic conduction (MIEC) material. A first side of a first memory structure is electrically coupled with a first side of the first access structure to form the combination device. A subtractive etching process is applied to the combination device such that a surface of the combination device that is substantially orthogonal to a plane of a substrate of the semiconductor device is within a defined tapering tolerance.
    Type: Application
    Filed: December 20, 2018
    Publication date: April 25, 2019
    Applicant: International Business Machines Corporation
    Inventors: Robert Bruce, Fabio Carta, Gloria WingYun Fraczak, Hiroyuki Miyazoe, Kumar R. Virwani
  • Publication number: 20190123100
    Abstract: A combined semiconductor device is fabricated by forming a first access structure from a mixed ionic electronic conduction (MIEC) material. A first side of a first memory structure is electrically coupled with a first side of the first access structure to form the combination device. A subtractive etching process is applied to the combination device such that a surface of the combination device that is substantially orthogonal to a plane of a substrate of the semiconductor device is within a defined tapering tolerance.
    Type: Application
    Filed: December 20, 2018
    Publication date: April 25, 2019
    Applicant: International Business Machines Corporation
    Inventors: ROBERT BRUCE, Fabio Carta, Gloria WingYun Fraczak, Hiroyuki Miyazoe, Kumar R. Virwani
  • Publication number: 20190115392
    Abstract: A combined semiconductor device is fabricated by forming a first access structure from a mixed ionic electronic conduction (MIEC) material. A first side of a first memory structure is electrically coupled with a first side of the first access structure to form the combination device. A subtractive etching process is applied to the combination device such that a surface of the combination device that is substantially orthogonal to a plane of a substrate of the semiconductor device is within a defined tapering tolerance.
    Type: Application
    Filed: October 16, 2017
    Publication date: April 18, 2019
    Applicant: International Business Machines Corporation
    Inventors: ROBERT BRUCE, Fabio Carta, Gloria WingYun Fraczak, Hiroyuki Miyazoe, Kumar R. Virwani
  • Patent number: 9951184
    Abstract: Polyhexahydrotriazine (PHT) film layers are formed by a process comprising heating a first mixture comprising i) a solvent, ii) paraformaldehyde, and iii) a diamine monomer comprising two primary aromatic amine groups at a temperature of about 20° C. to less than 150° C. This heating step forms a stable polyhemiaminal (PHA) in solution, which can be cast on a surface of a substrate, thereby forming an initial film layer comprising the PHA. The initial film layer is heated at a temperature of 180° C. to about 280° C., thereby converting the PHA film layer to a PHT film layer. Young's moduli of about 8 GPA to about 14 GPA have been observed for the PHT film layers.
    Type: Grant
    Filed: December 4, 2015
    Date of Patent: April 24, 2018
    Assignee: International Business Machines Corporation
    Inventors: James L. Hedrick, Jeannette M. O'Brien, Kumar R. Virwani
  • Patent number: 9773513
    Abstract: A chromium oxide film is formed at room temperature. The chromium oxide film has at least one partially polycrystalline portion and/or at least one amorphous portion depending upon the substrate(s) over which the chromium oxide film is formed. Partially polycrystalline portion(s) of the chromium oxide film are exposed, at room temperature, to an electron beam that has an accelerating voltage of at least 100 kilovolts to further crystallize the partially polycrystalline portion(s). Amorphous portion(s) of the chromium oxide film are exposed, at room temperature, to an electron beam that has an accelerating voltage of more than 100 kilovolts to crystallize the amorphous portion(s).
    Type: Grant
    Filed: June 18, 2015
    Date of Patent: September 26, 2017
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo, Charles T. Rettner, Philip M. Rice, Teya Topuria, Kumar R. Virwani
  • Patent number: 9766170
    Abstract: A method and computer product program for determining Young's modulus. The method includes placing a probe in contact with a surface of a material on a substrate and, with an initial force of 800 nano newtons or less; determining the location of the surface relative to an initial indentation depth for the initial force; increasing the force on the probe from the initial force to a maximum force greater than the initial force to generate a load curve; decreasing the force on the probe from the maximum force to the initial force to generate an unload curve, the maximum force selected such that the unload curve is independent of the presence of the substrate; and using the unload curve, determining a relationship between (i) the reduced modulus of the sample material and (ii) the ratio of probe penetration depth and the thickness of the layer.
    Type: Grant
    Filed: January 28, 2015
    Date of Patent: September 19, 2017
    Assignee: International Business Machines Corporation
    Inventors: Geraud J. Dubois, Jane E. Frommer, Robin S. King, Krystelle Lionti, Kumar R. Virwani, Willi Volksen
  • Patent number: 9705079
    Abstract: The present invention relates generally to high current density access devices (ADs), and more particularly, to a structure and method of forming tunable voltage margin access diodes in phase change memory (PCM) blocks using layers of copper-containing mixed ionic-electronic conduction (MIEC) materials. Embodiments of the present invention may use layers MIEC material to form an access device that can supply high current-densities and operate reliably while being fabricated at temperatures that are compatible with standard BEOL processing. By varying the deposition technique and amount of MIEC material used, the voltage margin (i.e. the voltage at which the device turns on and the current is above the noise floor) of the access device may be tuned to specific operating conditions of different memory devices.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: July 11, 2017
    Assignee: International Business Machines Corporation
    Inventors: Mohit Bajaj, Arpan K. Deb, Aniruddha Konar, Kota V. R. M. Murali, Rajan K. Pandey, Kumar R. Virwani
  • Patent number: 9680096
    Abstract: The present invention relates generally to high current density access devices (ADs), and more particularly, to a structure and method of forming tunable voltage margin access diodes in phase change memory (PCM) blocks using layers of copper-containing mixed ionic-electronic conduction (MIEC) materials. Embodiments of the present invention may use layers MIEC material to form an access device that can supply high current-densities and operate reliably while being fabricated at temperatures that are compatible with standard BEOL processing. By varying the deposition technique and amount of MIEC material used, the voltage margin (i.e. the voltage at which the device turns on and the current is above the noise floor) of the access device may be tuned to specific operating conditions of different memory devices.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: June 13, 2017
    Assignee: International Business Machines Corporation
    Inventors: Mohit Bajaj, Arpan K. Deb, Aniruddha Konar, Kota V. R. M. Murali, Rajan K. Pandey, Kumar R. Virwani
  • Patent number: 9647210
    Abstract: The present invention relates generally to high current density access devices (ADs), and more particularly, to a structure and method of forming tunable voltage margin access diodes in phase change memory (PCM) blocks using layers of copper-containing mixed ionic-electronic conduction (MIEC) materials. Embodiments of the present invention may use layers MIEC material to form an access device that can supply high current-densities and operate reliably while being fabricated at temperatures that are compatible with standard BEOL processing. By varying the deposition technique and amount of MIEC material used, the voltage margin (i.e. the voltage at which the device turns on and the current is above the noise floor) of the access device may be tuned to specific operating conditions of different memory devices.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: May 9, 2017
    Assignee: International Business Machines Corporation
    Inventors: Mohit Bajaj, Arpan K. Deb, Aniruddha Konar, Kota V. R. M. Murali, Rajan K. Pandey, Kumar R. Virwani
  • Patent number: 9589635
    Abstract: A device that includes a semiconductor device and a contact electrode with a first side that is opposite a second side. The first side abuts the semiconductor device. The contact electrode has a stoichiometry that varies from the first side to the second side. The stoichiometry of the first side inhibits the diffusion of metal from the semiconductor device into the first contact electrode.
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: March 7, 2017
    Assignee: International Business Machines Corporation
    Inventors: Mohit Bajaj, Geoffrey W. Burr, Kota V. R. M. Murali, Rajan K. Pandey, Rajesh Sathiyanarayanan, Kumar R. Virwani