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Advanced filters: Author: Kyoung-Woong Moon Clear advanced filters

  • Spin torques with different origins enable the magnetic domain wall motion, but the contributions are hard to be distinguished. Here, the authors show the method to measure both spin-magnetization transfer torque and spin–orbit torque by using mountain-shaped domains with straight domain walls.

    • Kyoung-Woong Moon
    • Changsoo Kim
    • Chanyong Hwang
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-8

  • Here, we investigated the details of magnetic skyrmion bubble domain formation by a tilted magnetic field. The in-plane component of the magnetic field serves to reduce the width of the stripe domain. These stripe domains are easily broken and bubble domains are formed. We have demonstrated that the key parameter determining the stripe domain instability is the stripe width, regardless of other material parameters. This bubble generation method can be applicable to generic magnetic films with perpendicular magnetic anisotropy. Our work will facilitate the development of skyrmion-based devices by offering a general method for controlling a large skyrmion population.

    • Kyoung-Woong Moon
    • Seungmo Yang
    • Chanyong Hwang
    ResearchOpen Access
    NPG Asia Materials
    Volume: 13, P: 1-8

  • We introduced spintronics-based synapses (spin-S) by utilizing a stripe domain ensuring its highly linear and symmetric weight responses, together with domain-wall motion-based neurons (spin-N) for activation functions. In addition, a crossbar array architecture for the spin-S/N has been proposed and experimentally demonstrated. A simple pattern-classification task was tested using an integrated network of electrically connected spin-S and spin-N to mimic a human brain. Our experimental findings provide a new avenue toward establishing more efficient neural network systems with spintronic devices.

    • Seungmo Yang
    • Jeonghun Shin
    • Jin Pyo Hong
    ResearchOpen Access
    NPG Asia Materials
    Volume: 13, P: 1-10