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The Influence of Surface Defects on Motion of Magnetic Vortices in Mesoscopic Type-II Superconductor with Randomly Distributed Pinning Centers

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Abstract

In the present work, the influences of surface defects on the motion of magnetic vortices in a mesoscopic type-II superconductor with randomly distributed pinning centers are considered using the time-dependent Ginzburg-Landau equations. Two kinds of surface defects are located in the boundary: first, the pinning centers. and second, the geometric defects simultaneously with pinning centers. In the simulation, the magnetization curves, vorticity, and the density of superconducting electrons for both different contents of pinning centers and various geometric defects are analyzed. For the pinning centers as surface defects, the maximum magnetization values as a function of the contents exponentially decrease, and the field \(H_1\) where the first vortex penetrates and the field \(H_2\) where the complete transition from superconducting to a normal state in the system occurs is reduced. For the geometric defects as surface defects, the density of superconducting electrons and the magnetization curves depend on both size and form of them. In addition, a threshold on the size of geometric defects in which the motion of vortices and vorticity changes is presented.

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Funding

This work was supported by the National Natural Science Foundation of Democratic People’s Republic of Korea (KJGG20180205).

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Authors and Affiliations

  1. Department of Physical Engineering, Kim Chaek University of Technology, Yonggwang Street, Pyongyang, Democratic People’s Republic of Korea

    Yu Gwang Ryu, Jong Hak Om, Jin Hak Kim, Gwang Il Ro & Gwang Il Mun

  2. Institute of Nano Science and Physical Engineering, Kim Chaek University of Technology, Yonggwang Street, Pyongyang, Democratic People’s Republic of Korea

    Songchol Hong

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  1. Yu Gwang Ryu
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  2. Jong Hak Om
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Correspondence to Yu Gwang Ryu.

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Ryu, Y.G., Om, J.H., Kim, J.H. et al. The Influence of Surface Defects on Motion of Magnetic Vortices in Mesoscopic Type-II Superconductor with Randomly Distributed Pinning Centers. J Supercond Nov Magn 37, 527–533 (2024). https://doi.org/10.1007/s10948-024-06694-w

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