Patents by Inventor Guohan Hu

Guohan Hu 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: 20170110506
    Abstract: A method for forming a memory device that includes providing a free layer of an alloy of cobalt (Co), iron (Fe) and boron (B) overlying a reference layer; and forming metal layer comprising a boron (B) sink composition atop the free layer. Boron (B) may be diffused from the free layer to the metal layer comprising the boron sink composition. At least a portion of the metal layer including the boron (B) sink composition is removed. A metal oxide is formed atop the free layer. The free layer may be a crystalline cobalt and iron alloy. An interface between the metal oxide and free layer can provide perpendicular magnetic anisotropy character.
    Type: Application
    Filed: October 14, 2015
    Publication date: April 20, 2017
    Inventors: Stephen L. Brown, Guohan Hu, Jonathan Z. Sun, Daniel C. Worledge
  • Publication number: 20170110655
    Abstract: Magnetic memory devices having an antiferromagnetic reference layer based on Co and Ir are provided. In one aspect, a magnetic memory device includes a reference magnetic layer having multiple Co-containing layers oriented in a stack, wherein adjacent Co-containing layers in the stack are separated by an Ir-containing layer such that the adjacent Co-containing layers in the stack are anti-parallel coupled by the Ir-containing layer therebetween; and a free magnetic layer separated from the reference magnetic layer by a barrier layer. A method of writing data to a magnetic random access memory device having at least one of the present magnetic memory cells is also provided.
    Type: Application
    Filed: December 23, 2016
    Publication date: April 20, 2017
    Inventors: Guohan Hu, Luqiao Liu, Jonathan Z. Sun, Daniel C. Worledge
  • Patent number: 9620708
    Abstract: A magnetic material includes a cobalt layer between opposing iron layers. The iron layers include iron and are body-centered cubic (BCC), the cobalt layer comprises cobalt and is BCC or amorphous, and the magnetic material has a perpendicular magnetic anisotropy (PMA).
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: April 11, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Guohan Hu, Daniel C. Worledge
  • Publication number: 20170084830
    Abstract: A method of making a spin-torque transfer magnetic random access memory device (STT MRAM) device includes forming a tunnel barrier layer on a reference layer; forming a free layer on the tunnel barrier layer, the free layer comprising a cobalt iron boron (CoFeB) alloy layer and an iron (Fe) layer; and performing a sputtering process to form a metal oxide layer on the Fe layer.
    Type: Application
    Filed: November 30, 2016
    Publication date: March 23, 2017
    Inventor: Guohan Hu
  • Publication number: 20170054072
    Abstract: Magnetoresistive random access memory (MRAM) devices include a first magnetic layer. A tunnel barrier layer is formed on the first magnetic layer. The tunnel barrier includes first regions having a first thickness and second regions having a second thickness that is greater than the first thickness. A second magnetic layer is formed on the tunnel barrier layer.
    Type: Application
    Filed: November 4, 2016
    Publication date: February 23, 2017
    Inventors: Guohan Hu, Daniel C. Worledge
  • Patent number: 9564580
    Abstract: A mechanism relates to magnetic random access memory (MRAM). A free magnetic layer is provided and first fixed layers are disposed above the free magnetic layer. Second fixed layers are disposed below the free magnetic layer. The first fixed layers and the second fixed layers both comprise a rare earth element.
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: February 7, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Guohan Hu, Daniel C. Worledge
  • Publication number: 20170033280
    Abstract: Magnetoresistive random access memory (MRAM) devices include a first magnetic layer. A tunnel barrier layer is formed on the first magnetic layer. The tunnel barrier includes first regions having a first thickness and second regions having a second thickness that is greater than the first thickness. A second magnetic layer is formed on the tunnel barrier layer.
    Type: Application
    Filed: May 18, 2016
    Publication date: February 2, 2017
    Inventors: Guohan Hu, Daniel C. Worledge
  • Patent number: 9537090
    Abstract: A method of making a spin-torque transfer magnetic random access memory device (STT MRAM) device includes forming a tunnel barrier layer on a reference layer; forming a free layer on the tunnel barrier layer, the free layer comprising a cobalt iron boron (CoFeB) alloy layer and an iron (Fe) layer; and performing a sputtering process to form a metal oxide layer on the Fe layer.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: January 3, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventor: Guohan Hu
  • Publication number: 20160380188
    Abstract: A method of making a spin-torque transfer magnetic random access memory device (STT MRAM) device includes forming a tunnel barrier layer on a reference layer; forming a free layer on the tunnel barrier layer, the free layer comprising a cobalt iron boron (CoFeB) alloy layer and an iron (Fe) layer; and performing a sputtering process to form a metal oxide layer on the Fe layer.
    Type: Application
    Filed: June 25, 2015
    Publication date: December 29, 2016
    Inventor: Guohan Hu
  • Publication number: 20160372658
    Abstract: A magnetic material includes a cobalt layer between opposing iron layers. The iron layers include iron and are body-centered cubic (BCC), the cobalt layer comprises cobalt and is BCC or amorphous, and the magnetic material has a perpendicular magnetic anisotropy (PMA).
    Type: Application
    Filed: September 1, 2016
    Publication date: December 22, 2016
    Inventors: Guohan Hu, Daniel C. Worledge
  • Publication number: 20160343936
    Abstract: A device includes a seed layer, a magnetic track layer disposed on the seed layer, an alloy layer disposed on the magnetic track layer, a tunnel barrier layer disposed on the alloy layer, a pinning layer disposed on the tunnel barrier layer, a synthetic antiferromagnetic layer spacer disposed on the pinning layer, a pinned layer disposed on the synthetic antiferromagnetic spacer layer and an antiferromagnetic layer disposed on the pinned layer, and another device includes a seed layer, an antiferromagnetic layer disposed on the seed layer, a pinned layer disposed on the antiferromagnetic layer, a synthetic antiferromagnetic layer spacer disposed on the pinned layer, a pinning layer disposed on the synthetic antiferromagnetic layer spacer, a tunnel barrier layer disposed on the pinning layer, an alloy layer disposed on the tunnel barrier layer and a magnetic track layer disposed on alloy layer.
    Type: Application
    Filed: August 5, 2016
    Publication date: November 24, 2016
    Inventors: Guohan Hu, Cheng-Wei Chien
  • Patent number: 9502641
    Abstract: A mechanism relates to magnetic random access memory (MRAM). A free magnetic layer is provided and first fixed layers are disposed above the free magnetic layer. Second fixed layers are disposed below the free magnetic layer. The first fixed layers and the second fixed layers both comprise a rare earth element.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: November 22, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Guohan Hu, Daniel C. Worledge
  • Patent number: 9490422
    Abstract: Magnetoresistive random access memory (MRAM) devices and methods for making the same include growing a tunnel barrier layer on a first magnetic layer. A thin layer of non-wetting material is formed on the tunnel barrier layer, such that the non-wetting material forms distinct regions on the tunnel barrier layer. A second magnetic layer is grown on the tunnel barrier layer.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: November 8, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Guohan Hu, Daniel C. Worledge
  • Patent number: 9484531
    Abstract: A magnetic material includes a cobalt layer between opposing iron layers. The iron layers include iron and are body-centered cubic (BCC), the cobalt layer comprises cobalt and is BCC or amorphous, and the magnetic material has a perpendicular magnetic anisotropy (PMA).
    Type: Grant
    Filed: June 19, 2015
    Date of Patent: November 1, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Guohan Hu, Daniel C. Worledge
  • Patent number: 9472754
    Abstract: Embodiments are directed to a magnetic tunnel junction (MTJ) memory cell that includes a reference layer formed from a perpendicular magnetic anisotropy (PMA) reference layer and an interfacial reference layer. The MTJ further includes a free layer and a tunnel barrier positioned between the interfacial reference layer and the free layer. The tunnel barrier is configured to enable electrons to tunnel through the tunnel barrier between the interfacial reference layer and the free layer. A first in-situ alignment is provided between a tunnel barrier lattice structure of the tunnel barrier and an interfacial reference layer lattice structure of the interfacial reference layer. A second in-situ alignment is provided between the tunnel barrier lattice structure of the tunnel barrier and a free layer lattice structure of the free layer. The PMA reference layer lattice structure is not aligned with the interfacial reference layer lattice structure.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: October 18, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Guohan Hu, Daniel C. Worledge
  • Publication number: 20160301002
    Abstract: Embodiments are directed to a magnetic tunnel junction (MTJ) memory cell that includes a reference layer formed from a perpendicular magnetic anisotropy (PMA) reference layer and an interfacial reference layer. The MTJ further includes a free layer and a tunnel barrier positioned between the interfacial reference layer and the free layer. The tunnel barrier is configured to enable electrons to tunnel through the tunnel barrier between the interfacial reference layer and the free layer. A first in-situ alignment is provided between a tunnel barrier lattice structure of the tunnel barrier and an interfacial reference layer lattice structure of the interfacial reference layer. A second in-situ alignment is provided between the tunnel barrier lattice structure of the tunnel barrier and a free layer lattice structure of the free layer. The PMA reference layer lattice structure is not aligned with the interfacial reference layer lattice structure.
    Type: Application
    Filed: June 15, 2016
    Publication date: October 13, 2016
    Inventors: Guohan Hu, Daniel C. Worledge
  • Patent number: 9466785
    Abstract: Magnetoresistive random access memory (MRAM) devices and methods for making the same include growing a tunnel barrier layer on a first magnetic layer. A thin layer of non-wetting material is formed on the tunnel barrier layer, such that the non-wetting material forms distinct regions on the tunnel barrier layer. A second magnetic layer is grown on the tunnel barrier layer.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: October 11, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Guohan Hu, Daniel C. Worledge
  • Publication number: 20160284986
    Abstract: A magnetic material includes a cobalt layer between opposing iron layers. The iron layers include iron and are body-centered cubic (BCC), the cobalt layer comprises cobalt and is BCC or amorphous, and the magnetic material has a perpendicular magnetic anisotropy (PMA).
    Type: Application
    Filed: June 19, 2015
    Publication date: September 29, 2016
    Inventors: Guohan Hu, Daniel C. Worledge
  • Publication number: 20160284984
    Abstract: A magnetic material includes a cobalt layer between opposing iron layers. The iron layers include iron and are body-centered cubic (BCC), the cobalt layer comprises cobalt and is BCC or amorphous, and the magnetic material has a perpendicular magnetic anisotropy (PMA).
    Type: Application
    Filed: June 9, 2016
    Publication date: September 29, 2016
    Inventors: Guohan Hu, Daniel C. Worledge
  • Patent number: 9431600
    Abstract: A device includes a seed layer, a magnetic track layer disposed on the seed layer, an alloy layer disposed on the magnetic track layer, a tunnel barrier layer disposed on the alloy layer, a pinning layer disposed on the tunnel barrier layer, a synthetic antiferromagnetic layer spacer disposed on the pinning layer, a pinned layer disposed on the synthetic antiferromagnetic spacer layer and an antiferromagnetic layer disposed on the pinned layer, and another device includes a seed layer, an antiferromagnetic layer disposed on the seed layer, a pinned layer disposed on the antiferromagnetic layer, a synthetic antiferromagnetic layer spacer disposed on the pinned layer, a pinning layer disposed on the synthetic antiferromagnetic layer spacer, a tunnel barrier layer disposed on the pinning layer, an alloy layer disposed on the tunnel barrier layer and a magnetic track layer disposed on alloy layer.
    Type: Grant
    Filed: October 6, 2014
    Date of Patent: August 30, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Guohan Hu, Cheng-Wei Chien