Patents by Inventor Yuchen Zhou

Yuchen Zhou 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: 10008663
    Abstract: The present invention is directed to an MTJ memory element, which includes a magnetic free layer structure having a variable magnetization direction perpendicular to a layer plane thereof; a tunnel junction layer formed adjacent to the magnetic free layer structure; a magnetic reference layer structure formed adjacent to the tunnel junction layer and having a first invariable magnetization direction perpendicular to a layer plane thereof; an anti-ferromagnetic coupling layer formed adjacent to the magnetic reference layer structure; and a magnetic fixed layer structure formed adjacent to the anti-ferromagnetic coupling layer and having a second invariable magnetization direction that is perpendicular to a layer plane thereof and is opposite to the first invariable magnetization direction. The magnetic fixed layer structure includes multiple stacks of a trilayer unit structure, which includes three layers of different materials with at least one of the three layers of different materials being magnetic.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: June 26, 2018
    Assignee: Avalanche Technology, Inc.
    Inventors: Xiaojie Hao, Zihui Wang, Huadong Gan, Yuchen Zhou, Yiming Huai
  • Publication number: 20180146183
    Abstract: The current invention relates to the method to achieve virtual reality or augmented reality with using flexible substrate containing light emitting arrays, or optical passage arrays, to project image upon the retinas of human eyes. Further, it relates to the method to detect the real-time focal length change of the eye-lens and modify the flexible substrate's curvature and distance from the eye to vary global angle configurations of light beams that go into the eye to produce images on the retina at various focus depth of the eyes to achieve re-focusable artificial vision.
    Type: Application
    Filed: December 8, 2017
    Publication date: May 24, 2018
    Inventor: Yuchen Zhou
  • Publication number: 20180090675
    Abstract: The present invention is directed to a magnetic memory element including a magnetic free layer and a first magnetic reference layer with an insulating tunnel junction layer interposed therebetween; a second magnetic reference layer made of a material comprising cobalt and formed adjacent to the first magnetic reference layer opposite the insulating tunnel junction layer; an iridium layer formed adjacent to the second magnetic reference layer opposite the first magnetic reference layer; and a magnetic fixed layer formed adjacent to the iridium layer. The magnetic free layer has a variable magnetization direction substantially perpendicular to the layer plane thereof. The first and second magnetic reference layers have a first fixed magnetization direction substantially perpendicular to the layer planes thereof.
    Type: Application
    Filed: November 16, 2017
    Publication date: March 29, 2018
    Inventors: Huadong Gan, Yiming Huai, Yuchen Zhou, Zihui Wang
  • Publication number: 20180076384
    Abstract: The present invention is directed to a magnetic memory element including a magnetic free layer structure having a variable magnetization direction perpendicular to a layer plane thereof; an insulating tunnel junction layer formed adjacent to the magnetic free layer structure; a first magnetic reference layer comprising cobalt, iron, and boron formed adjacent to the insulating tunnel junction layer; a second magnetic reference layer comprising cobalt separated from the first magnetic reference layer by a molybdenum layer; an iridium layer formed adjacent to the second magnetic reference layer; and a magnetic fixed layer structure formed adjacent to the iridium layer. The magnetic free layer structure includes a first and a second magnetic free layers with a perpendicular enhancement layer interposed therebetween. The first and second magnetic reference layers have a first invariable magnetization direction perpendicular to layer planes thereof.
    Type: Application
    Filed: November 17, 2017
    Publication date: March 15, 2018
    Inventors: Huadong Gan, Yiming Huai, Yuchen Zhou, Zihui Wang, Bing K. Yen, Xiaojie Hao, Pengfa Xu
  • Patent number: 9910107
    Abstract: A magnetic sensor with increased sensitivity, lower noise, and improved frequency response is described. The sensor's free layer is ribbon shaped and is closely flanked at each long edge by a ribbon of magnetically soft, high permeability material. Side stripes of soft magnetic material absorb external field flux and concentrate the flux to flow into the sensor's edges to promote larger MR sensor magnetization rotation. Side stripes are located in the plane of the free layer at a maximum distance of 0.1 microns from each side of the free layer. The free layer has a width <300 nm, a length of >1 micron, and an aspect ratio (thickness/width) of at least 5. Preferably, Mfilmtfilm>Mfreetfree, where Mfilm and Mfree are the magnetization of the soft magnetic layers and free layer, respectively, and ffilm and tfree are the thickness of the soft magnetic layers and free layer, respectively.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: March 6, 2018
    Assignee: Headway Technologies, Inc.
    Inventors: Yuchen Zhou, Yimin Guo
  • Patent number: 9871191
    Abstract: The present invention is directed to an MRAM device comprising a plurality of MTJ memory elements. Each of the memory elements includes a magnetic free layer and a first magnetic reference layer with an insulating tunnel junction layer interposed therebetween; a second magnetic reference layer formed adjacent to the first magnetic reference layer opposite the insulating tunnel junction layer; an anti-ferromagnetic coupling layer formed adjacent to the second magnetic reference layer opposite the first magnetic reference layer; and a magnetic fixed layer formed adjacent to the anti-ferromagnetic coupling layer. The magnetic free layer has a variable magnetization direction substantially perpendicular to the layer plane thereof. The first and second magnetic reference layers have a first fixed magnetization direction substantially perpendicular to the layer planes thereof.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: January 16, 2018
    Assignee: Avalanche Technology, Inc.
    Inventors: Yuchen Zhou, Yiming Huai, Zihui Wang, Xiaojie Hao, Huadong Gan, Xiaobin Wang
  • Patent number: 9871190
    Abstract: The present invention is directed to an MRAM device comprising a plurality of MTJ memory elements. Each of the memory elements includes a magnetic free layer and a first magnetic reference layer with an insulating tunnel junction layer interposed therebetween; a second magnetic reference layer formed adjacent to the first magnetic reference layer opposite the insulating tunnel junction layer; an anti-ferromagnetic coupling layer formed adjacent to the second magnetic reference layer opposite the first magnetic reference layer; and a magnetic fixed layer formed adjacent to the anti-ferromagnetic coupling layer. The magnetic free layer has a variable magnetization direction substantially perpendicular to the layer plane thereof. The first and second magnetic reference layers have a first fixed magnetization direction substantially perpendicular to the layer planes thereof.
    Type: Grant
    Filed: April 28, 2014
    Date of Patent: January 16, 2018
    Assignee: Avalanche Technology, Inc.
    Inventors: Huadong Gan, Yiming Huai, Yuchen Zhou, Xiaobin Wang, Zihui Wang
  • Publication number: 20170361076
    Abstract: Methods to collect use data of a user during customized skin care by using a specimen dispensing device are presented. Methods to utilize the embedded memory and electrical interface of the dispensing device and dispensers to collect use data of said user are also presented. The invention may also be applied to health care and personal care needs.
    Type: Application
    Filed: September 2, 2017
    Publication date: December 21, 2017
    Inventor: Yuchen Zhou
  • Patent number: 9831421
    Abstract: The present invention is directed to an MTJ memory element including a magnetic free layer structure which includes one or more magnetic free layers that have a same variable magnetization direction substantially perpendicular to layer planes thereof; an insulating tunnel junction layer formed adjacent to the magnetic free layer structure; a magnetic reference layer structure comprising a first magnetic reference layer formed adjacent to the insulating tunnel junction layer and a second magnetic reference layer separated therefrom by a perpendicular enhancement layer with the first and second magnetic reference layers having a first fixed magnetization direction substantially perpendicular to layer planes thereof; an anti-ferromagnetic coupling layer formed adjacent to the second magnetic reference layer opposite the perpendicular enhancement layer; and a magnetic fixed layer comprising first and second magnetic fixed sublayers with the second magnetic fixed sublayer formed adjacent to the anti-ferromagnetic
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: November 28, 2017
    Assignee: Avalanche Technology, Inc.
    Inventors: Zihui Wang, Huadong Gan, Yiming Huai, Yuchen Zhou, Xiaobin Wang, Bing K. Yen, Xiaojie Hao
  • Patent number: 9793319
    Abstract: The present invention is directed to a magnetic random access memory element that includes a multilayered seed structure formed by interleaving multiple layers of a first transition metal with multiple layers of a second transition metal; and a first magnetic layer formed on top of the multilayered seed structure. The first magnetic layer has a multilayer structure formed by interleaving layers of the first transition metal with layers of a magnetic material and has a first fixed magnetization direction substantially perpendicular to a layer plane thereof. The first transition metal is platinum or palladium, while the second transition metal is selected from the group consisting of tantalum, titanium, zirconium, hafnium, vanadium, niobium, chromium, molybdenum, and tungsten.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: October 17, 2017
    Assignee: Avalanche Technology, Inc.
    Inventors: Huadong Gan, Yiming Huai, Bing K. Yen, Roger K. Malmhall, Yuchen Zhou
  • Patent number: 9789295
    Abstract: Methods to provide customized skin care by using specimen dispensing device to dispense specimens from removable dispensers for the purpose of treating skin of a user are presented. Methods to utilize the embedded memory and electrical interface of the dispensing device and dispensers to produce customizable skin care products that give better skin treatment results are also presented. The invention may also be applied to health care and personal care needs.
    Type: Grant
    Filed: June 26, 2016
    Date of Patent: October 17, 2017
    Inventor: Yuchen Zhou
  • Publication number: 20170288137
    Abstract: The present invention is directed to an MTJ memory element including a magnetic free layer structure which includes one or more magnetic free layers that have a same variable magnetization direction substantially perpendicular to layer planes thereof; an insulating tunnel junction layer formed adjacent to the magnetic free layer structure; a magnetic reference layer structure comprising a first magnetic reference layer formed adjacent to the insulating tunnel junction layer and a second magnetic reference layer separated therefrom by a perpendicular enhancement layer with the first and second magnetic reference layers having a first fixed magnetization direction substantially perpendicular to layer planes thereof; an anti-ferromagnetic coupling layer formed adjacent to the second magnetic reference layer opposite the perpendicular enhancement layer; and a magnetic fixed layer comprising first and second magnetic fixed sublayers with the second magnetic fixed sublayer formed adjacent to the anti-ferromagnetic
    Type: Application
    Filed: July 13, 2015
    Publication date: October 5, 2017
    Inventors: Zihui Wang, Huadong Gan, Yiming Huai, Yuchen Zhou, Xiaobin Wang, Bing K. Yen, Xiaojie Hao
  • Patent number: 9780300
    Abstract: The present invention is directed to an MTJ memory element comprising a magnetic free layer structure including one or more magnetic free layers that have a variable magnetization direction substantially perpendicular to layer planes thereof; an insulating tunnel junction layer formed adjacent to the magnetic free layer structure; a magnetic reference layer structure including a first magnetic reference layer and a second magnetic reference layer with a perpendicular enhancement layer interposed therebetween, the first and second magnetic reference layers having a first fixed magnetization direction substantially perpendicular to layer planes thereof; an anti-ferromagnetic coupling layer formed adjacent to the second magnetic reference layer; and a magnetic fixed layer formed adjacent to the anti-ferromagnetic coupling layer.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: October 3, 2017
    Assignee: Avalanche Technology, Inc.
    Inventors: Yuchen Zhou, Bing K. Yen, Huadong Gan, Yiming Huai
  • Publication number: 20170264879
    Abstract: The current invention relates to the method and apparatus to determine the focus point of a viewer from a single eye of the viewer in a viewing space. The claimed method detects the focus depth and the line of eye sight from said single eye. It further relates to the method to use the determined focus point to achieve virtual reality and augmented reality.
    Type: Application
    Filed: May 22, 2017
    Publication date: September 14, 2017
    Inventor: Yuchen Zhou
  • Patent number: 9761254
    Abstract: A MR sensor is disclosed that has a free layer (FL) with perpendicular magnetic anisotropy (PMA), which eliminates the need for an adjacent hard bias structure to stabilize free layer magnetization, and minimizes shield-FL interactions. In a TMR embodiment, a seed layer, free layer, junction layer, reference layer, and pinning layer are sequentially formed on a bottom shield. After forming a sensor sidewall that stops in the seed layer or on the bottom shield, a conformal insulation layer is deposited. Thereafter, a top shield is formed on the insulation layer and includes side shields that are separated from the FL by a narrow read gap. The sensor is scalable to widths <50 nm when PMA is greater than the FL self-demag field. Effective bias field is rather insensitive to sensor aspect ratio, which makes tall stripe and narrow width sensors viable for high RA TMR configurations.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: September 12, 2017
    Assignee: Headway Technologies, Inc.
    Inventors: Yuchen Zhou, Kunliang Zhang, Zhi Gang Bai
  • Patent number: 9748471
    Abstract: The present invention is directed to an STT-MRAM device comprising a plurality of memory elements. Each of the memory elements includes an MTJ structure that comprises a magnetic free layer structure and a magnetic reference layer structure with an insulating tunnel junction layer interposed therebetween; a first perpendicular enhancement layer (PEL) formed adjacent to the magnetic free layer structure; a magnetic dead layer formed adjacent to the first PEL; and a magnetic fixed layer exchange coupled to the magnetic reference layer structure through an anti-ferromagnetic coupling layer. The magnetic reference layer structure includes a first magnetic reference layer formed adjacent to the insulating tunnel junction layer and a second magnetic reference layer separated from the first magnetic reference layer by a second PEL. The first and second magnetic reference layers have a first invariable magnetization direction substantially perpendicular to layer planes thereof.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: August 29, 2017
    Assignee: Avalanche Technology, Inc.
    Inventors: Yuchen Zhou, Zihui Wang, Huadong Gan, Yiming Huai
  • Patent number: 9699433
    Abstract: The current invention relates to the method to achieve re-focusable vision, including re-focusable stereo vision, with detecting the re-focusing event from a human eye. The method comprises utilizing optical and electrical sensing apparatus to detect the physiological change of viewer's eye without viewer's active participation or physical action, and retrieving the intended focus depth information of the viewer from such physiological information to update the visual impression perceived by the viewer that matches the intended focus depth, to achieve a re-focusable vision. The sensing apparatus includes both “glass” type and “contact-lens” type of see-through substrates that contain optical and electrical components that are necessary for obtaining the physiological information of viewer's eye and controlling the visual impression that the viewer perceives.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: July 4, 2017
    Inventor: Yuchen Zhou
  • Patent number: 9686383
    Abstract: Synchronization of traffic multiplexing in link aggregation is described. In an embodiment, a first link aggregator and a second link aggregator are associated with a plurality of links. The first link aggregator maintains an identifier for each link indicating at least a state of enabled or disabled. A synchronized clock is established between the first link aggregator and the second link aggregator. A particular link of the plurality of links is transitioned. Wherein, the transitioning is performed by the first link aggregator sending, to the second link aggregator, a first message identifying a particular time to transition the particular link. The first link aggregator receives, from the second link aggregator, a second message indicating that the particular time is acceptable. In response to a determination that the second message indicates that the particular time is acceptable and that the synchronized clock has reached the particular time, transitioning the link.
    Type: Grant
    Filed: December 30, 2015
    Date of Patent: June 20, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: Yuchen Zhou, Richard Stewart, Alex Tsai, Yibin Yang
  • Patent number: 9679625
    Abstract: An STTMRAM element includes a magnetic tunnel junction (MTJ) having a perpendicular magnetic orientation. The MTJ includes a barrier layer, a free layer formed on top of the barrier layer and having a magnetic orientation that is perpendicular and switchable relative to the magnetic orientation of the fixed layer. The magnetic orientation of the free layer switches when electrical current flows through the STTMRAM element. A switching-enhancing layer (SEL), separated from the free layer by a spacer layer, is formed on top of the free layer and has an in-plane magnetic orientation and generates magneto-static fields onto the free layer, causing the magnetic moments of the outer edges of the free layer to tilt with an in-plane component while minimally disturbing the magnetic moment at the center of the free layer to ease the switching of the free layer and to reduce the threshold voltage/current.
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: June 13, 2017
    Assignee: Avalanche Technology, Inc.
    Inventors: Jing Zhang, Yiming Huai, Rajiv Yadav Ranjan, Yuchen Zhou, Zihui Wang, Xiaojie Hao
  • Publication number: 20170162781
    Abstract: The present invention is directed to an STT-MRAM device comprising a plurality of memory elements. Each of the memory elements includes an MTJ structure that comprises a magnetic free layer structure and a magnetic reference layer structure with an insulating tunnel junction layer interposed therebetween; a first perpendicular enhancement layer (PEL) formed adjacent to the magnetic free layer structure; a magnetic dead layer formed adjacent to the first PEL; and a magnetic fixed layer exchange coupled to the magnetic reference layer structure through an anti-ferromagnetic coupling layer. The magnetic reference layer structure includes a first magnetic reference layer formed adjacent to the insulating tunnel junction layer and a second magnetic reference layer separated from the first magnetic reference layer by a second PEL. The first and second magnetic reference layers have a first invariable magnetization direction substantially perpendicular to layer planes thereof.
    Type: Application
    Filed: February 23, 2017
    Publication date: June 8, 2017
    Inventors: Yuchen Zhou, Zihui Wang, Huadong Gan, Yiming Huai