Patents by Inventor Jae Hak YANG

Jae Hak YANG 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).

  • Core magnetization reversal method of skyrmion and data storage device using the method
    Patent number: 12022744
    Abstract: A core magnetization reversal method includes transforming the first magnetic skyrmion into a skyrmionium by applying a first alternating current (AC) magnetic field to the first magnetic skyrmion, and then transforming the skyrmionium into a second magnetic skyrmion by applying a second AC magnetic field to the skyrmionium. The first magnetic skyrmion may be formed on a hemispherical shell, which may be formed by (i) preparing a membrane having a plurality of protrusions, and (ii) stacking, on the membrane, a first layer including at least one of platinum (Pt), nickel (Ni), and palladium (Pd), and a second layer including a ferromagnetic material. The first and second AC magnetic fields may have different frequencies.
    Type: Grant
    Filed: September 8, 2021
    Date of Patent: June 25, 2024
    Assignees: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION, SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Sang Koog Kim, Jae Hak Yang, Yoon Jong Song, Kil Ho Lee, Jun Hoe Kim
  • CORE MAGNETIZATION REVERSAL METHOD OF SKYRMION AND DATA STORAGE DEVICE USING THE METHOD
    Publication number: 20220384717
    Abstract: A core magnetization reversal method includes transforming the first magnetic skyrmion into a skyrmionium by applying a first alternating current (AC) magnetic field to the first magnetic skyrmion, and then transforming the skyrmionium into a second magnetic skyrmion by applying a second AC magnetic field to the skyrmionium. The first magnetic skyrmion may be formed on a hemispherical shell, which may be formed by (i) preparing a membrane having a plurality of protrusions, and (ii) stacking, on the membrane, a first layer including at least one of platinum (Pt), nickel (Ni), and palladium (Pd), and a second layer including a ferromagnetic material. The first and second AC magnetic fields may have different frequencies.
    Type: Application
    Filed: September 8, 2021
    Publication date: December 1, 2022
    Inventors: Sang Koog KIM, Jae Hak YANG, Yoon Jong SONG, Kil Ho LEE, Jun Hoe KIM